MAATHES THILAK K
INDIA • + Follow
Components
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ESP32-WROOM-32E-N4ESPRESSIF(乐鑫)
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x 1 | |
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TSSJ 5Knitter-Switch
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x 1 | |
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430182130816Würth Elektronik
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x 1 | |
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RS485 |
x 1 | |
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MICRO USB B |
x 1 |
Tools, APP Software Used etc.
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arduino IDEArduino
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INAV Configurator |
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BETAFLIGHT Configurator |
Description
SBUS-Transmitter Made with ESP32
This centroid file is an approximate pick-and-place reference created for early PCB planning of your ESP32 SBUS transmitter using an ESP32 development board and a MAX485 RS485 interface. All coordinates are assumed in millimeters, referenced from the bottom-left PCB origin, with components placed on the top layer only. The ESP32 dev board is treated as a single module, while discrete parts such as the MAX485, resistors, capacitors, switches, and connectors are positioned logically around it for routing feasibility and assembly clarity.
This data is not intended for final automated assembly and should not be used directly for manufacturing without verification. Exact centroid positions, rotations, and package definitions must be generated from your PCB CAD tool (KiCad) once footprints and board outline are finalized. Use this file strictly for conceptual validation, BOM correlation, and early mechanical planning before locking the design.
Code
CODE
Arduino
#include <Arduino.h>
// Use UART2 on ESP32//TX2 OF ESP32 WITH A3 OF BLACK PILL
HardwareSerial SBUS(2);
// ---------------- SBUS SETTINGS ----------------
#define SBUS_TX_PIN 17
#define SBUS_CHANNELS 16
#define SBUS_PACKET_LEN 25
#define SBUS_MIN 173
#define SBUS_MAX 1811
#define HEADER 0x0F
#define FOOTER 0x00
const int SBUS_RATE = 15; // 15 ms
uint16_t rc[SBUS_CHANNELS];
uint8_t packet[SBUS_PACKET_LEN];
unsigned long lastSend = 0;
// ---------------- INPUT PINS ----------------
// Joysticks
const int JOY1_X_PIN = 32;
const int JOY1_Y_PIN = 35;
const int JOY2_X_PIN = 34;
const int JOY2_Y_PIN = 33;
// 6 Switches
const int SW1_PIN = 25;
const int SW2_PIN = 26;
const int SW3_PIN = 27;
const int SW4_PIN = 14;
const int SW5_PIN = 21;
const int SW6_PIN = 22;
// ---------------- SBUS PACKET CREATOR ----------------
void createPacket() {
uint16_t ch[SBUS_CHANNELS];
for (int i = 0; i < SBUS_CHANNELS; i++)
ch[i] = map(rc[i], 1000, 2000, SBUS_MIN, SBUS_MAX);
packet[0] = HEADER;
packet[1] = ch[0] & 0xFF;
packet[2] = ((ch[0] >> 8) | (ch[1] << 3)) & 0xFF;
packet[3] = ((ch[1] >> 5) | (ch[2] << 6)) & 0xFF;
packet[4] = (ch[2] >> 2) & 0xFF;
packet[5] = ((ch[2] >> 10) | (ch[3] << 1)) & 0xFF;
packet[6] = ((ch[3] >> 7) | (ch[4] << 4)) & 0xFF;
packet[7] = ((ch[4] >> 4) | (ch[5] << 7)) & 0xFF;
packet[8] = (ch[5] >> 1) & 0xFF;
packet[9] = ((ch[5] >> 9) | (ch[6] << 2)) & 0xFF;
packet[10] = ((ch[6] >> 6) | (ch[7] << 5)) & 0xFF;
packet[11] = (ch[7] >> 3) & 0xFF;
packet[12] = ch[8] & 0xFF;
packet[13] = ((ch[8] >> 8) | (ch[9] << 3)) & 0xFF;
packet[14] = ((ch[9] >> 5) | (ch[10] << 6)) & 0xFF;
packet[15] = (ch[10] >> 2) & 0xFF;
packet[16] = ((ch[10] >> 10) | (ch[11] << 1)) & 0xFF;
packet[17] = ((ch[11] >> 7) | (ch[12] << 4)) & 0xFF;
packet[18] = ((ch[12] >> 4) | (ch[13] << 7)) & 0xFF;
packet[19] = (ch[13] >> 1) & 0xFF;
packet[20] = ((ch[13] >> 9) | (ch[14] << 2)) & 0xFF;
packet[21] = ((ch[14] >> 6) | (ch[15] << 5)) & 0xFF;
packet[22] = (ch[15] >> 3) & 0xFF;
packet[23] = 0x00; // flags
packet[24] = FOOTER;
}
// ---------------- SETUP ----------------
void setup() {
SBUS.begin(100000, SERIAL_8E2, -1, SBUS_TX_PIN);
Serial.begin(115200);
delay(200);
pinMode(SW1_PIN, INPUT_PULLUP);
pinMode(SW2_PIN, INPUT_PULLUP);
pinMode(SW3_PIN, INPUT_PULLUP);
pinMode(SW4_PIN, INPUT_PULLUP);
pinMode(SW5_PIN, INPUT_PULLUP);
pinMode(SW6_PIN, INPUT_PULLUP);
for (int i = 0; i < SBUS_CHANNELS; i++)
rc[i] = 1500;
}
// ---------------- LOOP ----------------
void loop() {
if (millis() - lastSend >= SBUS_RATE) {
lastSend = millis();
// ---- Read Joysticks (ADC) ----
// ---- Read Joysticks (ADC) ----
// CH0 = JOY2_X
rc[0] = map(analogRead(JOY2_X_PIN), 0, 4095, 1000, 2000);
// CH1 = JOY1_Y (inverted)
rc[1] = map(analogRead(JOY1_Y_PIN), 0, 4095, 2000, 1000);
// CH2 = JOY2_Y (this was CH3 earlier)
rc[2] = map(analogRead(JOY2_Y_PIN), 0, 4095, 2000, 1000);
// CH3 = JOY1_X (this was CH2 earlier)
rc[3] = map(analogRead(JOY1_X_PIN), 0, 4095, 1000, 2000);
// ---- Read Switches (digital) ----
rc[4] = digitalRead(SW1_PIN) ? 1000 : 2000;
rc[5] = digitalRead(SW2_PIN) ? 1000 : 2000;
rc[6] = digitalRead(SW3_PIN) ? 1000 : 2000;
rc[7] = digitalRead(SW4_PIN) ? 1000 : 2000;
rc[8] = digitalRead(SW5_PIN) ? 1000 : 2000;
rc[9] = digitalRead(SW6_PIN) ? 1000 : 2000;
// Idle for CH10–CH15
for (int i = 10; i < 16; i++)
rc[i] = 1500;
// ----- Serial Monitor Debug Output -----
Serial.print("CH0(J1_X)=");
Serial.print(rc[0]);
Serial.print(" CH1(J1_Y)=");
Serial.print(rc[1]);
Serial.print(" CH2(J2_X)=");
Serial.print(rc[2]);
Serial.print(" CH3(J2_Y)=");
Serial.print(rc[3]);
Serial.print(" SW1(CH4)=");
Serial.print(rc[4]);
Serial.print(" SW2(CH5)=");
Serial.print(rc[5]);
Serial.print(" SW3(CH6)=");
Serial.print(rc[6]);
Serial.print(" SW4(CH7)=");
Serial.print(rc[7]);
Serial.print(" SW5(CH8)=");
Serial.print(rc[8]);
Serial.print(" SW6(CH9)=");
Serial.print(rc[9]);
Serial.println();
createPacket();
SBUS.write(packet, SBUS_PACKET_LEN);
}
}
TX With RS485
https://github.com/MAATHES-THILAK-K/SBUS-TRANSMITTER/blob/main/src_/SBUS_TX_RS485.inoa
Schematic and Layout
Schematic
https://github.com/MAATHES-THILAK-K/SBUS-TRANSMITTER/blob/main/Images/SBUS_TRANSMITTER.pdf
Schematic - Fritzing
SBUS_TRANSMITTER.pdf
CAD-Custom parts and enclosures
Other Detials
https://github.com/MAATHES-THILAK-K/SBUS-TRANSMITTER/tree/main
Jan 26,2026
16 views
SBUS-Transmitter Made with ESP32
Custom ESP32-based SBUS transmitter delivering 16-channel RC output for STM32 flight controllers—ideal for testing, simulation, and DIY TX
16
1
1
Published: Jan 26,2026
Standard PCB
BOM(Bill of materials)
Centroid file
PCBWay Donate 10% cost To Author
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CERN-OHL-P-2.0
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Raspberry Pi 5 7 Inch Touch Screen IPS 1024x600 HD LCD HDMI-compatible Display for RPI 4B 3B+ OPI 5 AIDA64 PC Secondary Screen（Without Speaker）
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