Components

	TP4056 Li-Ion Battery Charger IC	x 1
	FP6291 Boost Converter IC	x 1
	18650 Lithium cell	x 1
	Device_LED Wurth Elektronik	x 1
	Micro USB 2.0 B type 5 Pin Connector	x 1

Tools, APP Software Used etc.

Esp Home Home Assistant Addon

Esp Home

Description

Battery Powered Attendance system using Face Recognition on ESP32-CAM Board

Project Overview

This project presents a face–recognition–based attendance system built using the ESP32-CAM development board. The system captures and recognises faces through its onboard camera and automatically logs attendance to Google Sheets via IFTTT webhooks. Designed to be wireless and battery-powered with a compact PCB, it eliminates manual roll calls, offers real-time data storage, and provides a cost-effective, portable solution for classrooms and workplaces.

Abstract / Summary

This project implements a smart attendance system using an ESP32-CAM development board. It captures faces, recognises registered users, and logs their attendance automatically into Google Sheets via IFTTT. Operated wirelessly and powered by a lithium battery, the system is compact, efficient, and ideal for classrooms or small offices.

Objectives

Automate attendance recording using face recognition
Eliminate manual intervention (paper/roll call)
Send attendance logs in real time to a cloud platform (Google Sheets)
Make the solution battery-powered and wireless for flexible installation

Components & Hardware

ESP32-CAM module (camera + WiFi + processing)
Lithium-ion cell (e.g. 18650)
TP4056 charger IC
Boost converter (e.g. FP6291) to stabilise voltage
Support passives (resistors, capacitors, etc.)
PCB board for mounting and interconnections

System Design & Architecture

A charger circuit handles battery charging (via TP4056), while a boost converter steps up battery voltage to the level required by the ESP32-CAM. The development board is laid out with connectors and headers for direct mounting, programming access, and stable operation.

Face Recognition & Attendance Flow

Camera & Web Interface: The ESP32-CAM streams video over WiFi and provides a web-based interface for controlling settings, enrolling faces, and enabling recognition.
Enrollment: Users’ faces are enrolled (captured multiple times) and assigned a face ID with a corresponding name.
Recognition: The system compares live camera feed to enrolled faces. If a match is found, the associated name (or ID) is retrieved.
Cloud Logging: Recognised attendance data is sent via webhooks to IFTTT, which then appends the name and timestamp to a Google Sheets spreadsheet.

Software & Code

Uses esp_camera.h and other ESP32 camera libraries for initialisation and streaming
Face-detection and recognition algorithms embedded in firmware for on-device processing
Web server endpoints for control, status, capture, and streaming are built into the ESP firmware
Integration code for IFTTT communication (webhooks) to link with Google Sheets

Challenges & Solutions

Power stability: Ensuring consistent voltage under varying battery conditions via a boost converter
Recognition accuracy: Careful face enrollment and filtering to reduce false positives/negatives
Network reliability: WiFi fluctuations handled via retries and error checking in webhook logic
User interface: Embedding a web interface on the ESP to manage settings and enrollments

Results & Testing

Successfully enrolled multiple faces, and the system correctly recognised them live via camera feed
Attendance entries were reliably sent and recorded into Google Sheets via IFTTT
Tested over extended durations on battery power, showing feasibility for daily usage

Future Enhancements

Add a fallback to local storage if the network is down
Add multi-user, multi-location support (e.g. multiple ESP32-CAM units syncing)
Include administrative UI (add/remove users)
Add security improvements (encryption, authentication)
Improve recognition robustness under varying lighting and occlusion

The ESP32-CAM-based attendance system successfully demonstrates how IoT and face recognition can automate record-keeping. It offers a reliable, low-cost, and portable solution for real-time attendance tracking, reducing manual effort and paving the way for smarter classrooms and offices.

Code

C/C++

app_httpd.cpp
#include "esp_http_server.h"
#include "esp_timer.h"
#include "esp_camera.h"
#include "img_converters.h"
#include "camera_index.h"
#include "Arduino.h"
#include "fb_gfx.h"
#include "fd_forward.h"
#include "dl_lib.h"
#include "fr_forward.h"
#define ENROLL_CONFIRM_TIMES 5
#define FACE_ID_SAVE_NUMBER 7
#define FACE_COLOR_WHITE  0x00FFFFFF
#define FACE_COLOR_BLACK  0x00000000
#define FACE_COLOR_RED    0x000000FF
#define FACE_COLOR_GREEN  0x0000FF00
#define FACE_COLOR_BLUE   0x00FF0000
#define FACE_COLOR_YELLOW (FACE_COLOR_RED | FACE_COLOR_GREEN)
#define FACE_COLOR_CYAN   (FACE_COLOR_BLUE | FACE_COLOR_GREEN)
#define FACE_COLOR_PURPLE (FACE_COLOR_BLUE | FACE_COLOR_RED)
//int FACE_ID;
extern int FACE_ID;
typedef struct {
        size_t size; //number of values used for filtering
        size_t index; //current value index
        size_t count; //value count
        int sum;
        int * values; //array to be filled with values
} ra_filter_t;
typedef struct {
        httpd_req_t *req;
        size_t len;
} jpg_chunking_t;
#define PART_BOUNDARY "123456789000000000000987654321"
static const char* _STREAM_CONTENT_TYPE = "multipart/x-mixed-replace;boundary=" PART_BOUNDARY;
static const char* _STREAM_BOUNDARY = "\r\n--" PART_BOUNDARY "\r\n";
static const char* _STREAM_PART = "Content-Type: image/jpeg\r\nContent-Length: %u\r\n\r\n";
static ra_filter_t ra_filter;
httpd_handle_t stream_httpd = NULL;
httpd_handle_t camera_httpd = NULL;
static mtmn_config_t mtmn_config = {0};
static int8_t detection_enabled = 0;
static int8_t recognition_enabled = 0;
static int8_t is_enrolling = 0;
static face_id_list id_list = {0};
static ra_filter_t * ra_filter_init(ra_filter_t * filter, size_t sample_size){
    memset(filter, 0, sizeof(ra_filter_t));
    filter->values = (int *)malloc(sample_size * sizeof(int));
    if(!filter->values){
        return NULL;
    }
    memset(filter->values, 0, sample_size * sizeof(int));
    filter->size = sample_size;
    return filter;
}
static int ra_filter_run(ra_filter_t * filter, int value){
    if(!filter->values){
        return value;
    }
    filter->sum -= filter->values[filter->index];
    filter->values[filter->index] = value;
    filter->sum += filter->values[filter->index];
    filter->index++;
    filter->index = filter->index % filter->size;
    if (filter->count < filter->size) {
        filter->count++;
    }
    return filter->sum / filter->count;
}
static void rgb_print(dl_matrix3du_t *image_matrix, uint32_t color, const char * str){
    fb_data_t fb;
    fb.width = image_matrix->w;
    fb.height = image_matrix->h;
    fb.data = image_matrix->item;
    fb.bytes_per_pixel = 3;
    fb.format = FB_BGR888;
    fb_gfx_print(&fb, (fb.width - (strlen(str) * 14)) / 2, 10, color, str);
}
static int rgb_printf(dl_matrix3du_t *image_matrix, uint32_t color, const char *format, ...){
    char loc_buf[64];
    char * temp = loc_buf;
    int len;
    va_list arg;
    va_list copy;
    va_start(arg, format);
    va_copy(copy, arg);
    len = vsnprintf(loc_buf, sizeof(loc_buf), format, arg);
    va_end(copy);
    if(len >= sizeof(loc_buf)){
        temp = (char*)malloc(len+1);
        if(temp == NULL) {
            return 0;
        }
    }
    vsnprintf(temp, len+1, format, arg);
    va_end(arg);
    rgb_print(image_matrix, color, temp);
    if(len > 64){
        free(temp);
    }
    return len;
}
static void draw_face_boxes(dl_matrix3du_t *image_matrix, box_array_t *boxes, int face_id){
    int x, y, w, h, i;
    uint32_t color = FACE_COLOR_YELLOW;
    if(face_id < 0){
        color = FACE_COLOR_RED;
    } else if(face_id > 0){
        color = FACE_COLOR_GREEN;
    }
    fb_data_t fb;
    fb.width = image_matrix->w;
    fb.height = image_matrix->h;
    fb.data = image_matrix->item;
    fb.bytes_per_pixel = 3;
    fb.format = FB_BGR888;
    for (i = 0; i < boxes->len; i++){
        // rectangle box
        x = (int)boxes->box[i].box_p[0];
        y = (int)boxes->box[i].box_p[1];
        w = (int)boxes->box[i].box_p[2] - x + 1;
        h = (int)boxes->box[i].box_p[3] - y + 1;
        fb_gfx_drawFastHLine(&fb, x, y, w, color);
        fb_gfx_drawFastHLine(&fb, x, y+h-1, w, color);
        fb_gfx_drawFastVLine(&fb, x, y, h, color);
        fb_gfx_drawFastVLine(&fb, x+w-1, y, h, color);
#if 0
        // landmark
        int x0, y0, j;
        for (j = 0; j < 10; j+=2) {
            x0 = (int)boxes->landmark[i].landmark_p[j];
            y0 = (int)boxes->landmark[i].landmark_p[j+1];
            fb_gfx_fillRect(&fb, x0, y0, 3, 3, color);
        }
#endif
    }
}
static int run_face_recognition(dl_matrix3du_t *image_matrix, box_array_t *net_boxes){
    dl_matrix3du_t *aligned_face = NULL;
    int matched_id = 0;
    aligned_face = dl_matrix3du_alloc(1, FACE_WIDTH, FACE_HEIGHT, 3);
    if(!aligned_face){
        Serial.println("Could not allocate face recognition buffer");
        return matched_id;
    }
    if (align_face(net_boxes, image_matrix, aligned_face) == ESP_OK){
        if (is_enrolling == 1){
            int8_t left_sample_face = enroll_face(&id_list, aligned_face);
            if(left_sample_face == (ENROLL_CONFIRM_TIMES - 1)){
                Serial.printf("Enrolling Face ID: %d\n", id_list.tail);
            }
            Serial.printf("Enrolling Face ID: %d sample %d\n", id_list.tail, ENROLL_CONFIRM_TIMES - left_sample_face);
            rgb_printf(image_matrix, FACE_COLOR_CYAN, "ID[%u] Sample[%u]", id_list.tail, ENROLL_CONFIRM_TIMES - left_sample_face);
            if (left_sample_face == 0){
                is_enrolling = 0;
                Serial.printf("Enrolled Face ID: %d\n", id_list.tail);
            }
        } else {
            matched_id = recognize_face(&id_list, aligned_face);
            if (matched_id >= 0) {
                Serial.printf("Match Face ID: %u\n", matched_id);
                rgb_printf(image_matrix, FACE_COLOR_GREEN, "Hello Subject %u", matched_id);
                FACE_ID = matched_id;
            } else {
                Serial.println("No Match Found");
                rgb_print(image_matrix, FACE_COLOR_RED, "Intruder Alert!");
                matched_id = -1;
            }
        }
    } else {
        Serial.println("Face Not Aligned");
        //rgb_print(image_matrix, FACE_COLOR_YELLOW, "Human Detected");
    }
    dl_matrix3du_free(aligned_face);
    return matched_id;
}
static size_t jpg_encode_stream(void * arg, size_t index, const void* data, size_t len){
    jpg_chunking_t *j = (jpg_chunking_t *)arg;
    if(!index){
        j->len = 0;
    }
    if(httpd_resp_send_chunk(j->req, (const char *)data, len) != ESP_OK){
        return 0;
    }
    j->len += len;
    return len;
}
static esp_err_t capture_handler(httpd_req_t *req){
    camera_fb_t * fb = NULL;
    esp_err_t res = ESP_OK;
    int64_t fr_start = esp_timer_get_time();
    fb = esp_camera_fb_get();
    if (!fb) {
        Serial.println("Camera capture failed");
        httpd_resp_send_500(req);
        return ESP_FAIL;
    }
    httpd_resp_set_type(req, "image/jpeg");
    httpd_resp_set_hdr(req, "Content-Disposition", "inline; filename=capture.jpg");
    size_t out_len, out_width, out_height;
    uint8_t * out_buf;
    bool s;
    bool detected = false;
    int face_id = 0;
    if(!detection_enabled || fb->width > 400){
        size_t fb_len = 0;
        if(fb->format == PIXFORMAT_JPEG){
            fb_len = fb->len;
            res = httpd_resp_send(req, (const char *)fb->buf, fb->len);
        } else {
            jpg_chunking_t jchunk = {req, 0};
            res = frame2jpg_cb(fb, 80, jpg_encode_stream, &jchunk)?ESP_OK:ESP_FAIL;
            httpd_resp_send_chunk(req, NULL, 0);
            fb_len = jchunk.len;
        }
        esp_camera_fb_return(fb);
        int64_t fr_end = esp_timer_get_time();
        Serial.printf("JPG: %uB %ums\n", (uint32_t)(fb_len), (uint32_t)((fr_end - fr_start)/1000));
        return res;
    }
    dl_matrix3du_t *image_matrix = dl_matrix3du_alloc(1, fb->width, fb->height, 3);
    if (!image_matrix) {
        esp_camera_fb_return(fb);
        Serial.println("dl_matrix3du_alloc failed");
        httpd_resp_send_500(req);
        return ESP_FAIL;
    }
    out_buf = image_matrix->item;
    out_len = fb->width * fb->height * 3;
    out_width = fb->width;
    out_height = fb->height;
    s = fmt2rgb888(fb->buf, fb->len, fb->format, out_buf);
    esp_camera_fb_return(fb);
    if(!s){
        dl_matrix3du_free(image_matrix);
        Serial.println("to rgb888 failed");
        httpd_resp_send_500(req);
        return ESP_FAIL;
    }
    box_array_t *net_boxes = face_detect(image_matrix, &mtmn_config);
    if (net_boxes){
        detected = true;
        if(recognition_enabled){
            face_id = run_face_recognition(image_matrix, net_boxes);
        }
        draw_face_boxes(image_matrix, net_boxes, face_id);
        free(net_boxes->box);
        free(net_boxes->landmark);
        free(net_boxes);
    }
    jpg_chunking_t jchunk = {req, 0};
    s = fmt2jpg_cb(out_buf, out_len, out_width, out_height, PIXFORMAT_RGB888, 90, jpg_encode_stream, &jchunk);
    dl_matrix3du_free(image_matrix);
    if(!s){
        Serial.println("JPEG compression failed");
        return ESP_FAIL;
    }
    int64_t fr_end = esp_timer_get_time();
    Serial.printf("FACE: %uB %ums %s%d\n", (uint32_t)(jchunk.len), (uint32_t)((fr_end - fr_start)/1000), detected?"DETECTED ":"", face_id);
    return res;
}
static esp_err_t stream_handler(httpd_req_t *req){
    camera_fb_t * fb = NULL;
    esp_err_t res = ESP_OK;
    size_t _jpg_buf_len = 0;
    uint8_t * _jpg_buf = NULL;
    char * part_buf[64];
    dl_matrix3du_t *image_matrix = NULL;
    bool detected = false;
    int face_id = 0;
    int64_t fr_start = 0;
    int64_t fr_ready = 0;
    int64_t fr_face = 0;
    int64_t fr_recognize = 0;
    int64_t fr_encode = 0;
    static int64_t last_frame = 0;
    if(!last_frame) {
        last_frame = esp_timer_get_time();
    }
    res = httpd_resp_set_type(req, _STREAM_CONTENT_TYPE);
    if(res != ESP_OK){
        return res;
    }
    while(true){
        detected = false;
        face_id = 0;
        fb = esp_camera_fb_get();
        if (!fb) {
            Serial.println("Camera capture failed");
            res = ESP_FAIL;
        } else {
            fr_start = esp_timer_get_time();
            fr_ready = fr_start;
            fr_face = fr_start;
            fr_encode = fr_start;
            fr_recognize = fr_start;
            if(!detection_enabled || fb->width > 400){
                if(fb->format != PIXFORMAT_JPEG){
                    bool jpeg_converted = frame2jpg(fb, 80, &_jpg_buf, &_jpg_buf_len);
                    esp_camera_fb_return(fb);
                    fb = NULL;
                    if(!jpeg_converted){
                        Serial.println("JPEG compression failed");
                        res = ESP_FAIL;
                    }
                } else {
                    _jpg_buf_len = fb->len;
                    _jpg_buf = fb->buf;
                }
            } else {
                image_matrix = dl_matrix3du_alloc(1, fb->width, fb->height, 3);
                if (!image_matrix) {
                    Serial.println("dl_matrix3du_alloc failed");
                    res = ESP_FAIL;
                } else {
                    if(!fmt2rgb888(fb->buf, fb->len, fb->format, image_matrix->item)){
                        Serial.println("fmt2rgb888 failed");
                        res = ESP_FAIL;
                    } else {
                        fr_ready = esp_timer_get_time();
                        box_array_t *net_boxes = NULL;
                        if(detection_enabled){
                            net_boxes = face_detect(image_matrix, &mtmn_config);
                        }
                        fr_face = esp_timer_get_time();
                        fr_recognize = fr_face;
                        if (net_boxes || fb->format != PIXFORMAT_JPEG){
                            if(net_boxes){
                                detected = true;
                                if(recognition_enabled){
                                    face_id = run_face_recognition(image_matrix, net_boxes);
                                }
                                fr_recognize = esp_timer_get_time();
                                draw_face_boxes(image_matrix, net_boxes, face_id);
                                free(net_boxes->box);
                                free(net_boxes->landmark);
                                free(net_boxes);
                            }
                            if(!fmt2jpg(image_matrix->item, fb->width*fb->height*3, fb->width, fb->height, PIXFORMAT_RGB888, 90, &_jpg_buf, &_jpg_buf_len)){
                                Serial.println("fmt2jpg failed");
                                res = ESP_FAIL;
                            }
                            esp_camera_fb_return(fb);
                            fb = NULL;
                        } else {
                            _jpg_buf = fb->buf;
                            _jpg_buf_len = fb->len;
                        }
                        fr_encode = esp_timer_get_time();
                    }
                    dl_matrix3du_free(image_matrix);
                }
            }
        }
        if(res == ESP_OK){
            size_t hlen = snprintf((char *)part_buf, 64, _STREAM_PART, _jpg_buf_len);
            res = httpd_resp_send_chunk(req, (const char *)part_buf, hlen);
        }
        if(res == ESP_OK){
            res = httpd_resp_send_chunk(req, (const char *)_jpg_buf, _jpg_buf_len);
        }
        if(res == ESP_OK){
            res = httpd_resp_send_chunk(req, _STREAM_BOUNDARY, strlen(_STREAM_BOUNDARY));
        }
        if(fb){
            esp_camera_fb_return(fb);
            fb = NULL;
            _jpg_buf = NULL;
        } else if(_jpg_buf){
            free(_jpg_buf);
            _jpg_buf = NULL;
        }
        if(res != ESP_OK){
            break;
        }
        int64_t fr_end = esp_timer_get_time();
        int64_t ready_time = (fr_ready - fr_start)/1000;
        int64_t face_time = (fr_face - fr_ready)/1000;
        int64_t recognize_time = (fr_recognize - fr_face)/1000;
        int64_t encode_time = (fr_encode - fr_recognize)/1000;
        int64_t process_time = (fr_encode - fr_start)/1000;        
        int64_t frame_time = fr_end - last_frame;
        last_frame = fr_end;
        frame_time /= 1000;
        uint32_t avg_frame_time = ra_filter_run(&ra_filter, frame_time);
        Serial.printf("MJPG: %uB %ums (%.1ffps), AVG: %ums (%.1ffps), %u+%u+%u+%u=%u %s%d\n",
            (uint32_t)(_jpg_buf_len),
            (uint32_t)frame_time, 1000.0 / (uint32_t)frame_time,
            avg_frame_time, 1000.0 / avg_frame_time,
            (uint32_t)ready_time, (uint32_t)face_time, (uint32_t)recognize_time, (uint32_t)encode_time, (uint32_t)process_time,
            (detected)?"DETECTED ":"", face_id
        );
    }
    last_frame = 0;
    return res;
}
static esp_err_t cmd_handler(httpd_req_t *req){
    char*  buf;
    size_t buf_len;
    char variable[32] = {0,};
    char value[32] = {0,};
    buf_len = httpd_req_get_url_query_len(req) + 1;
    if (buf_len > 1) {
        buf = (char*)malloc(buf_len);
        if(!buf){
            httpd_resp_send_500(req);
            return ESP_FAIL;
        }
        if (httpd_req_get_url_query_str(req, buf, buf_len) == ESP_OK) {
            if (httpd_query_key_value(buf, "var", variable, sizeof(variable)) == ESP_OK &&
                httpd_query_key_value(buf, "val", value, sizeof(value)) == ESP_OK) {
            } else {
                free(buf);
                httpd_resp_send_404(req);
                return ESP_FAIL;
            }
        } else {
            free(buf);
            httpd_resp_send_404(req);
            return ESP_FAIL;
        }
        free(buf);
    } else {
        httpd_resp_send_404(req);
        return ESP_FAIL;
    }
    int val = atoi(value);
    sensor_t * s = esp_camera_sensor_get();
    int res = 0;
    if(!strcmp(variable, "framesize")) {
        if(s->pixformat == PIXFORMAT_JPEG) res = s->set_framesize(s, (framesize_t)val);
    }
    else if(!strcmp(variable, "quality")) res = s->set_quality(s, val);
    else if(!strcmp(variable, "contrast")) res = s->set_contrast(s, val);
    else if(!strcmp(variable, "brightness")) res = s->set_brightness(s, val);
    else if(!strcmp(variable, "saturation")) res = s->set_saturation(s, val);
    else if(!strcmp(variable, "gainceiling")) res = s->set_gainceiling(s, (gainceiling_t)val);
    else if(!strcmp(variable, "colorbar")) res = s->set_colorbar(s, val);
    else if(!strcmp(variable, "awb")) res = s->set_whitebal(s, val);
    else if(!strcmp(variable, "agc")) res = s->set_gain_ctrl(s, val);
    else if(!strcmp(variable, "aec")) res = s->set_exposure_ctrl(s, val);
    else if(!strcmp(variable, "hmirror")) res = s->set_hmirror(s, val);
    else if(!strcmp(variable, "vflip")) res = s->set_vflip(s, val);
    else if(!strcmp(variable, "awb_gain")) res = s->set_awb_gain(s, val);
    else if(!strcmp(variable, "agc_gain")) res = s->set_agc_gain(s, val);
    else if(!strcmp(variable, "aec_value")) res = s->set_aec_value(s, val);
    else if(!strcmp(variable, "aec2")) res = s->set_aec2(s, val);
    else if(!strcmp(variable, "dcw")) res = s->set_dcw(s, val);
    else if(!strcmp(variable, "bpc")) res = s->set_bpc(s, val);
    else if(!strcmp(variable, "wpc")) res = s->set_wpc(s, val);
    else if(!strcmp(variable, "raw_gma")) res = s->set_raw_gma(s, val);
    else if(!strcmp(variable, "lenc")) res = s->set_lenc(s, val);
    else if(!strcmp(variable, "special_effect")) res = s->set_special_effect(s, val);
    else if(!strcmp(variable, "wb_mode")) res = s->set_wb_mode(s, val);
    else if(!strcmp(variable, "ae_level")) res = s->set_ae_level(s, val);
    else if(!strcmp(variable, "face_detect")) {
        detection_enabled = val;
        if(!detection_enabled) {
            recognition_enabled = 0;
        }
    }
    else if(!strcmp(variable, "face_enroll")) is_enrolling = val;
    else if(!strcmp(variable, "face_recognize")) {
        recognition_enabled = val;
        if(recognition_enabled){
            detection_enabled = val;
        }
    }
    else {
        res = -1;
    }
    if(res){
        return httpd_resp_send_500(req);
    }
    httpd_resp_set_hdr(req, "Access-Control-Allow-Origin", "*");
    return httpd_resp_send(req, NULL, 0);
}
static esp_err_t status_handler(httpd_req_t *req){
    static char json_response[1024];
    sensor_t * s = esp_camera_sensor_get();
    char * p = json_response;
    *p++ = '{';
    p+=sprintf(p, "\"framesize\":%u,", s->status.framesize);
    p+=sprintf(p, "\"quality\":%u,", s->status.quality);
    p+=sprintf(p, "\"brightness\":%d,", s->status.brightness);
    p+=sprintf(p, "\"contrast\":%d,", s->status.contrast);
    p+=sprintf(p, "\"saturation\":%d,", s->status.saturation);
    p+=sprintf(p, "\"special_effect\":%u,", s->status.special_effect);
    p+=sprintf(p, "\"wb_mode\":%u,", s->status.wb_mode);
    p+=sprintf(p, "\"awb\":%u,", s->status.awb);
    p+=sprintf(p, "\"awb_gain\":%u,", s->status.awb_gain);
    p+=sprintf(p, "\"aec\":%u,", s->status.aec);
    p+=sprintf(p, "\"aec2\":%u,", s->status.aec2);
    p+=sprintf(p, "\"ae_level\":%d,", s->status.ae_level);
    p+=sprintf(p, "\"aec_value\":%u,", s->status.aec_value);
    p+=sprintf(p, "\"agc\":%u,", s->status.agc);
    p+=sprintf(p, "\"agc_gain\":%u,", s->status.agc_gain);
    p+=sprintf(p, "\"gainceiling\":%u,", s->status.gainceiling);
    p+=sprintf(p, "\"bpc\":%u,", s->status.bpc);
    p+=sprintf(p, "\"wpc\":%u,", s->status.wpc);
    p+=sprintf(p, "\"raw_gma\":%u,", s->status.raw_gma);
    p+=sprintf(p, "\"lenc\":%u,", s->status.lenc);
    p+=sprintf(p, "\"vflip\":%u,", s->status.vflip);
    p+=sprintf(p, "\"hmirror\":%u,", s->status.hmirror);
    p+=sprintf(p, "\"dcw\":%u,", s->status.dcw);
    p+=sprintf(p, "\"colorbar\":%u,", s->status.colorbar);
    p+=sprintf(p, "\"face_detect\":%u,", detection_enabled);
    p+=sprintf(p, "\"face_enroll\":%u,", is_enrolling);
    p+=sprintf(p, "\"face_recognize\":%u", recognition_enabled);
    *p++ = '}';
    *p++ = 0;
    httpd_resp_set_type(req, "application/json");
    httpd_resp_set_hdr(req, "Access-Control-Allow-Origin", "*");
    return httpd_resp_send(req, json_response, strlen(json_response));
}
static esp_err_t index_handler(httpd_req_t *req){
    httpd_resp_set_type(req, "text/html");
    httpd_resp_set_hdr(req, "Content-Encoding", "gzip");
    return httpd_resp_send(req, (const char *)index_html_gz, index_html_gz_len);
}
void startCameraServer(){
    httpd_config_t config = HTTPD_DEFAULT_CONFIG();
    httpd_uri_t index_uri = {
        .uri       = "/",
        .method    = HTTP_GET,
        .handler   = index_handler,
        .user_ctx  = NULL
    };
    httpd_uri_t status_uri = {
        .uri       = "/status",
        .method    = HTTP_GET,
        .handler   = status_handler,
        .user_ctx  = NULL
    };
    httpd_uri_t cmd_uri = {
        .uri       = "/control",
        .method    = HTTP_GET,
        .handler   = cmd_handler,
        .user_ctx  = NULL
    };
    httpd_uri_t capture_uri = {
        .uri       = "/capture",
        .method    = HTTP_GET,
        .handler   = capture_handler,
        .user_ctx  = NULL
    };
   httpd_uri_t stream_uri = {
        .uri       = "/stream",
        .method    = HTTP_GET,
        .handler   = stream_handler,
        .user_ctx  = NULL
    };
    ra_filter_init(&ra_filter, 20);    
    mtmn_config.min_face = 80;
    mtmn_config.pyramid = 0.7;
    mtmn_config.p_threshold.score = 0.6;
    mtmn_config.p_threshold.nms = 0.7;
    mtmn_config.r_threshold.score = 0.7;
    mtmn_config.r_threshold.nms = 0.7;
    mtmn_config.r_threshold.candidate_number = 4;
    mtmn_config.o_threshold.score = 0.7;
    mtmn_config.o_threshold.nms = 0.4;
    mtmn_config.o_threshold.candidate_number = 1;
    mtmn_config = mtmn_init_config();
    face_id_init(&id_list, FACE_ID_SAVE_NUMBER, ENROLL_CONFIRM_TIMES);   
    Serial.printf("Starting web server on port: '%d'\n", config.server_port);
    if (httpd_start(&camera_httpd, &config) == ESP_OK) {
        httpd_register_uri_handler(camera_httpd, &index_uri);
        httpd_register_uri_handler(camera_httpd, &cmd_uri);
        httpd_register_uri_handler(camera_httpd, &status_uri);
        httpd_register_uri_handler(camera_httpd, &capture_uri);
    }
    config.server_port += 1;
    config.ctrl_port += 1;
    Serial.printf("Starting stream server on port: '%d'\n", config.server_port);
    if (httpd_start(&stream_httpd, &config) == ESP_OK) {
        httpd_register_uri_handler(stream_httpd, &stream_uri);
    }
} 
camera_index.h
//File: index.html.gz, Size: 3663
#define index_html_gz_len 3663
const uint8_t index_html_gz[] = {
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 0x68, 0x74, 0x6D, 0x6C, 0x00, 0xDD, 0x5C, 0xEB, 0x72, 0x9B, 0xC8, 0x12, 0xFE, 0x7F, 0x9E, 0x02,
 0x93, 0xDD, 0x08, 0x6A, 0x91, 0x2C, 0xC9, 0x8A, 0xE3, 0x20, 0x0B, 0x1F, 0x5B, 0x76, 0x92, 0xAD,
 0xCA, 0x6D, 0xE3, 0x3D, 0xBB, 0x5B, 0xB5, 0xB5, 0x95, 0x8C, 0x60, 0x90, 0x26, 0x46, 0x8C, 0x02,
 0x83, 0x2E, 0xD1, 0xF2, 0x1C, 0xE7, 0x81, 0xCE, 0x8B, 0x9D, 0x9E, 0x19, 0x40, 0xA0, 0x8B, 0x65,
 0x49, 0x89, 0x94, 0x5A, 0xBB, 0xCA, 0x1A, 0xA0, 0xBB, 0xA7, 0xBB, 0xBF, 0xBE, 0x0C, 0x88, 0xF1,
 0xF9, 0x91, 0x43, 0x6D, 0x36, 0x19, 0x60, 0xA5, 0xC7, 0xFA, 0x9E, 0xF5, 0xAF, 0x73, 0xF9, 0xA1,
 0xC0, 0xCF, 0x79, 0x0F, 0x23, 0x47, 0x0E, 0xC5, 0x61, 0x1F, 0x33, 0xA4, 0xD8, 0x3D, 0x14, 0x84,
 0x98, 0xB5, 0xD4, 0x88, 0xB9, 0xE5, 0x33, 0x75, 0xFE, 0xB2, 0x8F, 0xFA, 0xB8, 0xA5, 0x0E, 0x09,
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 0x07, 0x0F, 0x89, 0x8D, 0xCB, 0xE2, 0xC0, 0x20, 0x3E, 0x61, 0x04, 0x79, 0xE5, 0xD0, 0x46, 0x1E,
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 0xD5, 0x1B, 0xA7, 0xD5, 0xF3, 0x63, 0x79, 0x6E, 0x46, 0x13, 0xB2, 0x09, 0x3F, 0xEE, 0x50, 0x67,
 0x32, 0x75, 0x61, 0x9A, 0xB2, 0x8B, 0xFA, 0xC4, 0x9B, 0x98, 0x97, 0x01, 0x08, 0x35, 0x5E, 0x62,
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 0xBB, 0x6E, 0x40, 0x23, 0xDF, 0x31, 0x1F, 0xD5, 0xCE, 0xF8, 0x6F, 0xD3, 0xA6, 0x1E, 0x0D, 0xCC,
 0x47, 0x37, 0xCF, 0xF9, 0x6F, 0x53, 0xC8, 0x09, 0xC9, 0x17, 0x6C, 0xD6, 0x4E, 0x07, 0xE3, 0xB8,
 0x57, 0x9F, 0xE6, 0xCE, 0x9C, 0xC1, 0x99, 0x10, 0xDB, 0x8C, 0x50, 0xBF, 0xD2, 0x47, 0xC4, 0x9F,
 0x3A, 0x24, 0x1C, 0x78, 0x68, 0x62, 0xBA, 0x1E, 0x1E, 0xC7, 0x8F, 0xFA, 0xD8, 0x8F, 0x8C, 0xC2,
 0x75, 0x7E, 0xBE, 0xEC, 0x90, 0x40, 0x9E, 0x33, 0x61, 0xAA, 0xA8, 0xEF, 0x4B, 0xC2, 0x8C, 0xD7,
 0xA7, 0x3E, 0x6E, 0x0A, 0xC2, 0x51, 0x80, 0x06, 0x70, 0xC8, 0x3F, 0x9A, 0x7D, 0xE2, 0x4B, 0x27,
 0x99, 0x27, 0x8D, 0xEA, 0x60, 0x5C, 0x50, 0xFC, 0xE4, 0x94, 0xFF, 0x36, 0x07, 0xC8, 0x71, 0x88,
 0xDF, 0x35, 0xCF, 0xF8, 0x65, 0x1A, 0x38, 0x38, 0x28, 0x07, 0xC8, 0x21, 0x51, 0x68, 0x36, 0xE0,
 0x4C, 0x1F, 0x05, 0x5D, 0x90, 0xC1, 0xE8, 0xC0, 0x2C, 0xD7, 0xAA, 0xB3, 0x13, 0x01, 0xE9, 0xF6,
 0x98, 0xC9, 0xCF, 0xC4, 0x8F, 0x12, 0x6C, 0x0A, 0x66, 0xE4, 0x54, 0x11, 0x8A, 0x20, 0x8F, 0x74,
 0xFD, 0x32, 0x61, 0xB8, 0x1F, 0x9A, 0x21, 0x0B, 0x30, 0xB3, 0x7B, 0xB1, 0x4B, 0xBA, 0x51, 0x80,
 0xA7, 0xA9, 0x02, 0xD5, 0x44, 0x36, 0x0C, 0xCA, 0x23, 0xDC, 0xB9, 0x23, 0xAC, 0x9C, 0x4C, 0xD6,
 0xC1, 0x2E, 0x0D, 0x70, 0x46, 0x50, 0xEE, 0x78, 0xD4, 0xBE, 0x2B, 0x87, 0x0C, 0x05, 0x6C, 0x91,
 0x18, 0xB9, 0x0C, 0x07, 0xF3, 0xB4, 0x18, 0x0C, 0x5E, 0xA0, 0x4C, 0x05, 0x24, 0x87, 0xC4, 0xF7,
 0x88, 0x8F, 0x57, 0x89, 0x95, 0x12, 0x8A, 0xA4, 0xE2, 0x5C, 0x62, 0x86, 0x42, 0xFA, 0xDD, 0xCC,
 0x03, 0x62, 0xD2, 0xA6, 0x74, 0x7C, 0xAD, 0x5A, 0xFD, 0xB1, 0xD9, 0xC3, 0xC2, 0x5F, 0x28, 0x62,
 0xF4, 0x7E, 0x27, 0xF3, 0xD8, 0xF8, 0x77, 0x1F, 0x3B, 0x04, 0x29, 0xDA, 0x0C, 0x3C, 0xE5, 0xAC,
 0x0A, 0x9E, 0xD6, 0x15, 0xE4, 0x3B, 0x8A, 0x46, 0x03, 0x02, 0xDE, 0x46, 0x22, 0x14, 0x3C, 0x38,
 0x03, 0x61, 0x3F, 0xC0, 0xFA, 0x74, 0x1D, 0x0C, 0x49, 0x44, 0xAC, 0x06, 0x62, 0x89, 0x05, 0x7D,
 0x34, 0x2E, 0xE7, 0xAC, 0xE0, 0x87, 0x89, 0x25, 0x90, 0x6A, 0xB6, 0x06, 0x27, 0x87, 0x3D, 0xA5,
 0xAC, 0xF0, 0xD0, 0xD2, 0x13, 0x73, 0x85, 0x89, 0x39, 0x73, 0xFF, 0x29, 0x28, 0xA7, 0x19, 0xFB,
 0xA8, 0x13, 0x31, 0x46, 0xFD, 0x70, 0x8D, 0x9B, 0x3F, 0x45, 0x21, 0x23, 0xEE, 0xA4, 0x9C, 0x80,
 0x62, 0x86, 0x03, 0x04, 0xF5, 0xAA, 0x83, 0xD9, 0x08, 0x63, 0x48, 0x5D, 0x1F, 0x0D, 0x01, 0xEE,
 0x6E, 0xD7, 0xC3, 0x53, 0x3B, 0x0A, 0x42, 0xA8, 0x1C, 0x03, 0x4A, 0x80, 0x32, 0x68, 0x16, 0x00,
 0xC8, 0x13, 0x96, 0xED, 0xCE, 0x94, 0x46, 0x8C, 0xAB, 0x04, 0x2A, 0x52, 0x90, 0x47, 0xD8, 0x04,
 0x46, 0xD2, 0xED, 0xD5, 0xD4, 0xE7, 0xD5, 0x39, 0x1E, 0xD3, 0xEE, 0x61, 0xFB, 0x0E, 0x3B, 0x3F,
 0x15, 0xCB, 0x85, 0x28, 0x35, 0x15, 0xE2, 0x0F, 0x22, 0x56, 0xE6, 0x05, 0x61, 0xB0, 0xC6, 0x1E,
 0xE1, 0x89, 0x64, 0x8A, 0x7A, 0x3D, 0x8B, 0x59, 0xF3, 0xC9, 0x60, 0xAC, 0x54, 0x0B, 0x82, 0x2C,
 0x0F, 0x75, 0xB0, 0x97, 0x89, 0x4B, 0x9C, 0x28, 0xE3, 0x29, 0x09, 0x82, 0x5C, 0xF5, 0xC8, 0x55,
 0xA8, 0xC6, 0xD3, 0x1F, 0x0B, 0x82, 0x14, 0x31, 0x36, 0x0A, 0xA7, 0x42, 0xEC, 0x01, 0x0C, 0xB2,
 0x20, 0xC2, 0x99, 0x91, 0x59, 0x8B, 0x2B, 0x01, 0xF2, 0xBB, 0x18, 0x00, 0x1C, 0x1B, 0xE9, 0x30,
 0x57, 0x52, 0x97, 0x4D, 0x6F, 0x56, 0x15, 0x50, 0x3B, 0x96, 0x40, 0x2E, 0x44, 0x7C, 0x6A, 0x56,
 0x8E, 0xBA, 0x56, 0xCF, 0x6A, 0x23, 0x38, 0xBA, 0xE0, 0x0A, 0x5E, 0x35, 0xE7, 0x10, 0x4C, 0x3A,
 0x81, 0xEB, 0x16, 0xFB, 0x84, 0xEB, 0x9E, 0x54, 0x4F, 0x1A, 0x73, 0xD9, 0xCF, 0xE7, 0x29, 0xF6,
 0x8A, 0x66, 0x86, 0x71, 0xA2, 0xA0, 0xD9, 0xA3, 0x43, 0x1C, 0x4C, 0x8B, 0xA2, 0x1A, 0xCF, 0x1A,
 0x4E, 0x7A, 0x1D, 0x41, 0x5C, 0x0E, 0x71, 0x91, 0xA0, 0x5E, 0xB3, 0xEB, 0xB5, 0x84, 0xA0, 0x02,
 0x16, 0xA2, 0x8E, 0x87, 0x9D, 0x34, 0xD4, 0x1C, 0xEC, 0xA2, 0xC8, 0x63, 0x05, 0xED, 0x50, 0x95,
 0xFF, 0xC6, 0xC2, 0xD7, 0x7F, 0xF2, 0x36, 0xDE, 0x12, 0xBE, 0xFC, 0x6B, 0x9A, 0x26, 0x08, 0x1A,
 0x0C, 0x30, 0x82, 0x73, 0x36, 0x96, 0xAD, 0x66, 0xB1, 0xB8, 0x89, 0xB0, 0x58, 0xD2, 0x60, 0xE6,
 0xDC, 0x93, 0xA6, 0xFF, 0xE2, 0x5C, 0xA6, 0x4B, 0xED, 0x28, 0x9C, 0x05, 0xF9, 0x12, 0x0A, 0x33,
 0x55, 0x27, 0xF4, 0x88, 0x70, 0x63, 0xE4, 0xFB, 0xDC, 0xB6, 0x32, 0x0B, 0x60, 0xE2, 0xE9, 0x12,
 0xA5, 0x16, 0xF1, 0xC9, 0xAB, 0x98, 0xB4, 0xEB, 0x22, 0x28, 0xD5, 0x0C, 0x6B, 0x25, 0xA4, 0x30,
 0x8F, 0x92, 0x90, 0x3D, 0x40, 0x1F, 0xD6, 0x8B, 0xFA, 0x9D, 0x69, 0xC2, 0x5E, 0x83, 0xDC, 0x90,
 0x02, 0x82, 0x6E, 0x07, 0x69, 0x55, 0xA3, 0x6A, 0x9C, 0xC0, 0x1F, 0xBD, 0xE0, 0x30, 0xA9, 0x72,
 0xBD, 0xBE, 0xD0, 0x7D, 0x9F, 0xCC, 0xF7, 0xEB, 0x24, 0x80, 0xE6, 0xAC, 0x59, 0x85, 0x4F, 0xA1,
 0x71, 0xD7, 0x2A, 0x3C, 0xE0, 0x57, 0x38, 0x7C, 0x9D, 0x53, 0x17, 0xFD, 0xB5, 0xD4, 0x11, 0x7D,
 0xFA, 0xA5, 0x2C, 0xF3, 0xEF, 0x60, 0x58, 0xE4, 0x54, 0xD8, 0x37, 0x0E, 0xCB, 0xF5, 0x09, 0xB7,
 0xF4, 0x45, 0x55, 0x49, 0xED, 0x2E, 0xCB, 0x6A, 0x02, 0x62, 0x7C, 0x68, 0x21, 0x01, 0xB4, 0x92,
 0xE6, 0xC2, 0x99, 0x55, 0x73, 0xBB, 0xC4, 0xF3, 0xCA, 0x1E, 0x1D, 0xCD, 0x55, 0x8F, 0x82, 0x9F,
 0xE7, 0xFD, 0x3A, 0xEF, 0xFE, 0x7B, 0x65, 0x47, 0x10, 0x73, 0xDF, 0x40, 0xF6, 0xFE, 0x93, 0x68,
 0x06, 0xCA, 0x3D, 0x49, 0xB2, 0xCE, 0xA3, 0x0F, 0x60, 0x5D, 0x74, 0x98, 0xAC, 0x91, 0x71, 0x25,
 0x1C, 0x11, 0x58, 0x89, 0xCD, 0x35, 0xA3, 0x01, 0x0D, 0x89, 0x58, 0xE6, 0x05, 0xD8, 0x43, 0xBC,
 0xC8, 0x2F, 0xB6, 0xE1, 0xB9, 0xE6, 0x91, 0xBB, 0x94, 0xCA, 0x94, 0x6D, 0xF4, 0x61, 0x4B, 0x87,
 0x8A, 0xAC, 0x00, 0x49, 0xBC, 0x0A, 0xE7, 0x15, 0x8A, 0x7B, 0xC1, 0xB7, 0xF5, 0x7B, 0x63, 0x38,
 0x09, 0xDC, 0x6E, 0x80, 0x27, 0xA9, 0x58, 0x23, 0xF9, 0x34, 0xE5, 0x4A, 0x6F, 0x79, 0x8F, 0x16,
 0x71, 0x2D, 0xAD, 0xAE, 0x34, 0xC2, 0x78, 0x8E, 0x65, 0xD1, 0x23, 0xE9, 0x02, 0x4B, 0x55, 0x17,
 0xA0, 0xCF, 0x92, 0x4D, 0xB8, 0x26, 0xC9, 0x41, 0x3E, 0xF4, 0xB0, 0xCB, 0xC4, 0xC2, 0x9B, 0x57,
 0xC7, 0x93, 0x42, 0x84, 0x94, 0x67, 0xDD, 0x5B, 0xE2, 0x99, 0xAD, 0x9F, 0x52, 0xDF, 0x2C, 0xA3,
 0xE5, 0x31, 0xB5, 0x9C, 0x3C, 0x55, 0x3C, 0x2D, 0xB1, 0xC2, 0x3C, 0x38, 0xD3, 0x97, 0x09, 0x0C,
 0x46, 0xE0, 0x3F, 0xB4, 0xFA, 0x29, 0x5F, 0x3F, 0xAF, 0xBE, 0x14, 0x27, 0xCB, 0x9E, 0x85, 0x94,
 0x48, 0x5B, 0x6C, 0x2E, 0x0A, 0x1A, 0x73, 0x98, 0xCD, 0x70, 0x5F, 0x58, 0x79, 0xC0, 0x6A, 0xAB,
 0x8F, 0xA0, 0x58, 0x72, 0x17, 0xC2, 0x6D, 0x26, 0xD8, 0xB6, 0xE8, 0xDE, 0xD9, 0xF2, 0xAC, 0x76,
 0xCA, 0x6F, 0xF6, 0x2A, 0xB6, 0x47, 0xC3, 0x1C, 0x0E, 0xA8, 0x03, 0x9A, 0x44, 0x0C, 0x37, 0xE5,
 0x92, 0xEE, 0x49, 0xE2, 0xD4, 0x27, 0xCB, 0xD3, 0x2E, 0x87, 0x41, 0x1E, 0x9A, 0xA2, 0x66, 0x35,
 0x7E, 0xAF, 0x93, 0x5F, 0x45, 0x31, 0x3C, 0x86, 0xFE, 0xC6, 0xEF, 0x5B, 0x4C, 0x1B, 0x8B, 0x30,
 0xCB, 0xA7, 0x41, 0x6D, 0x71, 0x09, 0x16, 0x57, 0x7A, 0xC4, 0x71, 0xB0, 0x5F, 0xB8, 0x39, 0x8E,
 0x67, 0x77, 0xFC, 0xC7, 0xC9, 0x2D, 0xBF, 0x3C, 0x98, 0x3D, 0x9D, 0x38, 0xE7, 0xCF, 0x00, 0xF2,
 0x4F, 0x06, 0xE4, 0x92, 0x5F, 0xB1, 0x3D, 0x14, 0x86, 0x2D, 0x95, 0xDF, 0x8B, 0xE7, 0x1E, 0x2E,
 0x08, 0x12, 0x87, 0x0C, 0x15, 0xE2, 0xB4, 0x54, 0x8F, 0x76, 0xE9, 0xDC, 0x35, 0x71, 0x5D, 0x2C,
 0x86, 0x15, 0x40, 0xB5, 0xA5, 0x16, 0x96, 0xE5, 0xAA, 0xE0, 0x9A, 0x9D, 0x52, 0xAD, 0xC7, 0x8F,
 0x9E, 0x3D, 0x7D, 0x7A, 0xDA, 0x7C, 0xEC, 0x77, 0xC2, 0x41, 0xF2, 0xF7, 0x57, 0x71, 0x09, 0x16,
 0xBD, 0x8C, 0xC1, 0x42, 0x34, 0x3C, 0x3F, 0x16, 0xD2, 0xE6, 0x34, 0x38, 0x06, 0x15, 0x56, 0x28,
 0x95, 0xE4, 0xC6, 0x32, 0xBD, 0x52, 0x92, 0x10, 0x82, 0xB4, 0x83, 0x82, 0x25, 0x24, 0x82, 0x4C,
 0xC4, 0xB4, 0x22, 0x4A, 0x9A, 0x2A, 0x22, 0xBB, 0x43, 0xC7, 0xF3, 0xAA, 0x0B, 0x6B, 0x92, 0xB0,
 0x4F, 0xA8, 0xB0, 0xB3, 0x4A, 0x20, 0xB0, 0x09, 0x76, 0x7E, 0x33, 0xB2, 0x82, 0x26, 0xD3, 0x2F,
 0x71, 0x7B, 0x6E, 0xFD, 0x2F, 0xA7, 0x76, 0x03, 0xD4, 0xC7, 0x3C, 0xDA, 0x93, 0x93, 0xAB, 0xC5,
 0xCC, 0x43, 0x90, 0x71, 0xAA, 0xD6, 0x7B, 0x2C, 0x02, 0x17, 0xE0, 0x5D, 0xEA, 0xD6, 0x05, 0x29,
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 0x0D, 0xBA, 0xC8, 0x8F, 0xC5, 0x85, 0x7E, 0xF1, 0x82, 0x84, 0xF5, 0xAA, 0x38, 0x3D, 0x04, 0x7B,
 0x4E, 0xB5, 0xE6, 0xD5, 0x05, 0xB0, 0x9B, 0x9F, 0x41, 0xBA, 0xE1, 0x17, 0xB9, 0x3B, 0x90, 0x04,
 0xB1, 0xB1, 0x55, 0x9C, 0x65, 0xB9, 0xD0, 0xE3, 0x05, 0x5F, 0x88, 0xE3, 0xB9, 0x9D, 0x45, 0x5A,
 0xB0, 0x1A, 0x1C, 0x9E, 0xDF, 0xBA, 0x11, 0xDE, 0x4B, 0x90, 0xFB, 0x66, 0x15, 0x68, 0xD9, 0x3D,
 0x41, 0x36, 0xFF, 0xBD, 0x5F, 0x49, 0x6F, 0x06, 0x45, 0xBD, 0xC0, 0xCC, 0x40, 0x37, 0x82, 0xAC,
 0x63, 0xAD, 0xA8, 0x28, 0x71, 0xA2, 0x79, 0x74, 0x8F, 0x62, 0x98, 0x6B, 0x3E, 0xBC, 0x97, 0x20,
 0xFF, 0x4E, 0x05, 0xE8, 0x12, 0x2D, 0xE8, 0x12, 0xE9, 0x46, 0x94, 0xE9, 0x92, 0x95, 0xBD, 0x74,
 0xF6, 0xD1, 0x3D, 0xC2, 0xD3, 0x82, 0xA7, 0x1B, 0xE3, 0xD5, 0x54, 0x85, 0x57, 0x24, 0x41, 0x81,
 0xD1, 0x82, 0x02, 0x23, 0xDD, 0x18, 0x65, 0x0A, 0x64, 0x25, 0x33, 0x55, 0x60, 0xB2, 0x26, 0xFD,
 0xE4, 0x0D, 0x15, 0xE8, 0xF0, 0x65, 0x0D, 0xE1, 0xAC, 0xF8, 0xEA, 0xC6, 0xE5, 0x3D, 0xB4, 0xE9,
 0x1E, 0x4F, 0xD0, 0xF5, 0x72, 0x41, 0xD7, 0x4B, 0xDD, 0x78, 0x72, 0x7E, 0x29, 0x1B, 0x09, 0x14,
 0x6F, 0xA2, 0x4D, 0x78, 0x45, 0x33, 0x88, 0xF6, 0x85, 0x7F, 0x42, 0xF0, 0x4E, 0xE6, 0x58, 0x92,
 0xBA, 0x9A, 0x31, 0x5D, 0x68, 0xC8, 0xC3, 0x01, 0xD3, 0x4A, 0xEF, 0x3C, 0x0C, 0xAB, 0x8C, 0xE4,
 0xAD, 0x4B, 0xA5, 0xFD, 0xF3, 0x73, 0x85, 0x06, 0x8A, 0xF8, 0x0F, 0x03, 0x4A, 0x90, 0xED, 0x50,
 0x55, 0xE4, 0x26, 0x72, 0x05, 0xF3, 0x7F, 0xCB, 0x01, 0x21, 0xA5, 0xB0, 0x1E, 0x09, 0x15, 0x17,
 0xF3, 0xFD, 0x1B, 0xF8, 0x88, 0x63, 0x4F, 0x89, 0xA3, 0x24, 0x5A, 0xE8, 0x26, 0x3F, 0xD2, 0x3A,
 0xDA, 0x44, 0x37, 0x8E, 0x26, 0xA9, 0x47, 0x41, 0x4B, 0xDE, 0x5B, 0x32, 0x15, 0x41, 0xC7, 0x2F,
 0x07, 0xD1, 0xF1, 0x4B, 0x41, 0xC7, 0x2F, 0x00, 0xD8, 0x2C, 0x03, 0x7A, 0x52, 0x43, 0x30, 0xA3,
 0xAA, 0x27, 0xBD, 0x10, 0x5A, 0x57, 0x33, 0xBF, 0xCC, 0x4C, 0x16, 0x95, 0xF2, 0x48, 0x6E, 0xD7,
 0x3E, 0x3F, 0x16, 0xFF, 0x6A, 0xEE, 0xFF, 0x81, 0x09, 0x07, 0x8B, 0x81, 0x4E, 0x00, 0x00
}; 
CameraWebServer.ino
#include "esp_camera.h"
#include <WiFi.h>
//
// WARNING!!! Make sure that you have either selected ESP32 Wrover Module,
//            or another board which has PSRAM enabled
//
// Select camera model
//#define CAMERA_MODEL_WROVER_KIT
//#define CAMERA_MODEL_M5STACK_PSRAM
#define CAMERA_MODEL_AI_THINKER
const int WiFi_led = 14;
const char* ssid = "jervisdesktop";
const char* password = "joydip98";
int FACE_ID;
String student, student1, student2; 
const char *server = "maker.ifttt.com";
const char* resource = "/trigger/attendance/with/key/hUAAAz0AVvc6-NW1UmqWXXv6VQWmpiGFxx3sV5rnaM9";
#if defined(CAMERA_MODEL_WROVER_KIT)
#define PWDN_GPIO_NUM    -1
#define RESET_GPIO_NUM   -1
#define XCLK_GPIO_NUM    21
#define SIOD_GPIO_NUM    26
#define SIOC_GPIO_NUM    27
#define Y9_GPIO_NUM      35
#define Y8_GPIO_NUM      34
#define Y7_GPIO_NUM      39
#define Y6_GPIO_NUM      36
#define Y5_GPIO_NUM      19
#define Y4_GPIO_NUM      18
#define Y3_GPIO_NUM       5
#define Y2_GPIO_NUM       4
#define VSYNC_GPIO_NUM   25
#define HREF_GPIO_NUM    23
#define PCLK_GPIO_NUM    22
#elif defined(CAMERA_MODEL_M5STACK_PSRAM)
#define PWDN_GPIO_NUM     -1
#define RESET_GPIO_NUM    15
#define XCLK_GPIO_NUM     27
#define SIOD_GPIO_NUM     25
#define SIOC_GPIO_NUM     23
#define Y9_GPIO_NUM       19
#define Y8_GPIO_NUM       36
#define Y7_GPIO_NUM       18
#define Y6_GPIO_NUM       39
#define Y5_GPIO_NUM        5
#define Y4_GPIO_NUM       34
#define Y3_GPIO_NUM       35
#define Y2_GPIO_NUM       32
#define VSYNC_GPIO_NUM    22
#define HREF_GPIO_NUM     26
#define PCLK_GPIO_NUM     21
#elif defined(CAMERA_MODEL_AI_THINKER)
#define PWDN_GPIO_NUM     32
#define RESET_GPIO_NUM    -1
#define XCLK_GPIO_NUM      0
#define SIOD_GPIO_NUM     26
#define SIOC_GPIO_NUM     27
#define Y9_GPIO_NUM       35
#define Y8_GPIO_NUM       34
#define Y7_GPIO_NUM       39
#define Y6_GPIO_NUM       36
#define Y5_GPIO_NUM       21
#define Y4_GPIO_NUM       19
#define Y3_GPIO_NUM       18
#define Y2_GPIO_NUM        5
#define VSYNC_GPIO_NUM    25
#define HREF_GPIO_NUM     23
#define PCLK_GPIO_NUM     22
#else
#error "Camera model not selected"
#endif
void startCameraServer();
void setup() {
  Serial.begin(115200);
  Serial.setDebugOutput(true);
  Serial.println();
  camera_config_t config;
  config.ledc_channel = LEDC_CHANNEL_0;
  config.ledc_timer = LEDC_TIMER_0;
  config.pin_d0 = Y2_GPIO_NUM;
  config.pin_d1 = Y3_GPIO_NUM;
  config.pin_d2 = Y4_GPIO_NUM;
  config.pin_d3 = Y5_GPIO_NUM;
  config.pin_d4 = Y6_GPIO_NUM;
  config.pin_d5 = Y7_GPIO_NUM;
  config.pin_d6 = Y8_GPIO_NUM;
  config.pin_d7 = Y9_GPIO_NUM;
  config.pin_xclk = XCLK_GPIO_NUM;
  config.pin_pclk = PCLK_GPIO_NUM;
  config.pin_vsync = VSYNC_GPIO_NUM;
  config.pin_href = HREF_GPIO_NUM;
  config.pin_sscb_sda = SIOD_GPIO_NUM;
  config.pin_sscb_scl = SIOC_GPIO_NUM;
  config.pin_pwdn = PWDN_GPIO_NUM;
  config.pin_reset = RESET_GPIO_NUM;
  config.xclk_freq_hz = 20000000;
  config.pixel_format = PIXFORMAT_JPEG;
  //init with high specs to pre-allocate larger buffers
  if(psramFound()){
    config.frame_size = FRAMESIZE_UXGA;
    config.jpeg_quality = 10;
    config.fb_count = 2;
  } else {
    config.frame_size = FRAMESIZE_SVGA;
    config.jpeg_quality = 12;
    config.fb_count = 1;
  }
  // camera init
  esp_err_t err = esp_camera_init(&config);
  if (err != ESP_OK) {
    Serial.printf("Camera init failed with error 0x%x", err);
    return;
  }
  //drop down frame size for higher initial frame rate
  sensor_t * s = esp_camera_sensor_get();
  s->set_framesize(s, FRAMESIZE_QVGA);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
  while (WiFi.status() == WL_CONNECTED) {
    digitalWrite(WiFi_led, HIGH);
    Serial.print("LED High");
  }
  startCameraServer();
  Serial.print("Camera Ready! Use 'http://");
  Serial.print(WiFi.localIP());
  Serial.println("' to connect");
}
void loop() {
  // put your main code here, to run repeatedly:
  Serial.print("Face ID: ");
  Serial.print(FACE_ID);
  if (FACE_ID == 1){
      student = "Thor";
      makeIFTTTRequest();
      delay(10000);
  }  
  if (FACE_ID == 2){
      student = "Ashish Mishra";
      makeIFTTTRequest();
      delay(10000);
  }
  if (FACE_ID == 3){
      student = "Joydip Dutta";
      makeIFTTTRequest();
      delay(10000);
  }
  if (FACE_ID == 4){
      student = "Ashish Choudhary";
      makeIFTTTRequest();
      delay(10000);
  }    
}
void makeIFTTTRequest() {
  Serial.print("Connecting to "); 
  Serial.print(server);  
  WiFiClient client;
  int retries = 5;
  while(!!!client.connect(server, 80) && (retries-- > 0)) {
    Serial.print(".");
  }
  Serial.println();
  if(!!!client.connected()) {
    Serial.println("Failed to connect...");
  }  
  Serial.print("Request resource: "); 
  Serial.println(resource);
  // Temperature in Celsius
 // String jsonObject = String("{\"value1\":\"") + student + "\"}";
 String jsonObject = String("{\"value1\":\"") + student + "\",\"value2\":\"" + student1
                      + "\",\"value3\":\"" + student2 + "\"}";                      
  // Comment the previous line and uncomment the next line to publish temperature readings in Fahrenheit                    
  /*String jsonObject = String("{\"value1\":\"") + (1.8 * bme.readTemperature() + 32) + "\",\"value2\":\"" 
                      + (bme.readPressure()/100.0F) + "\",\"value3\":\"" + bme.readHumidity() + "\"}";*/                      
  client.println(String("POST ") + resource + " HTTP/1.1");
  client.println(String("Host: ") + server); 
  client.println("Connection: close\r\nContent-Type: application/json");
  client.print("Content-Length: ");
  client.println(jsonObject.length());
  client.println();
  client.println(jsonObject);        
  int timeout = 5 * 10; // 5 seconds             
  while(!!!client.available() && (timeout-- > 0)){
    delay(100);
  }
  if(!!!client.available()) {
    Serial.println("No response...");
  }
  while(client.available()){
    Serial.write(client.read());
  }  
  Serial.println("\nclosing connection");
  client.stop(); 
}

Download Gerbers

Sep 29,2025

2,254 views

Battery Powered Attendance system using Face Recognition on ESP32-CAM Board

Smart face-recognition attendance system: ESP32-CAM captures faces, logs attendance to Google Sheets, fast, wireless, and efficient.

2254

Published: Sep 29,2025

Standard PCB

Download Gerber file 12

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