6 Channel Advanced ESP32 Relay Board

Material List

ESP32 Development Board

6 Channel Relay Module

Jumper Cables

USB Cable (to connect the ESP32 to a computer)

Breadboard (for circuit prototyping)

Computer

Arduino IDE

KiCad (for PCB design)

Steps;

Step 1: Preparing the Required Software and Tools

Download and install the Arduino IDE on your computer.

Follow the instructions for introducing the ESP32 board in Arduino IDE.

Use the Library Manager in Arduino IDE to load the required libraries.

Step 2: Making Circuit Connections

Connect your ESP32 board to your computer.

If you are using a breadboard, you can make your connections on the breadboard to create the circuit more easily.

Connect the 6-channel relay module to the ESP32 with jumper cables. The VCC pin of each relay channel should be connected to the 3.3V pin and the GND pin to ground.

The signal pin of each relay channel should be connected to a different GPIO pin.

Step 3: Preparing and Loading the Arduino Code

Open the Arduino IDE.

Create a new project in the Arduino IDE.

Write an Arduino code that correctly identifies the GPIO pins of the ESP32 and the 6-channel relay module. This code allows each relay channel to turn on and off.

Compile your code and upload it to your ESP32 board.

Step 4: Testing

Connect your ESP32 board to your computer with a USB cable.

Open the serial monitor in Arduino IDE and observe the status of the ESP32.

Check that each relay channel is responding to see if your code is working.

Step 5: PCB Design of 6 Channel Relay System with KiCad

Download and install KiCad.

Create a new project, specify the project folder.

Create the schematic design with "Eeschema". Draw the connections of the 6 relay channels correctly.

Proceed to PCB design with "Pcbnew". Place the component footprints, draw the traces.

Check your design and prepare it for production.

Step 6: PCB Fabrication and Assembly

Send your production files to a PCB production service.

Obtain the manufactured PCB.

Solder components to the PCB.

Step 7: Testing

Test the assembled PCB by connecting it to the power supply.

Check connections, component placement and functionality of each relay channel.

Suitable Batteries:

Lithium Ion Battery: Lithium ion batteries such as 18650 can provide portable and high capacity power.

LiPo Battery: Lithium Polymer batteries can be a suitable power source for your projects with their thin and flexible structure.

AA or AAA Batteries: You can also power the ESP32 board with these types of standard batteries, but you may need to use a voltage regulator.

MQTT for Internet Communication:

MQTT (Message Queuing Telemetry Transport) is a lightweight and secure messaging protocol for transmitting data between devices. Using the MQTT protocol you can transmit data by connecting your ESP32 to the internet. You can use for example Mosquitto as an MQTT server.

Basic Code Examples:

Adding the MQTT Library:

Install the PubSubClient MQTT library using the "Library Manager" in the Arduino IDE.

WiFi Connection and MQTT Settings:

Basic Code Examples:

Adding the MQTT Library:

Install the PubSubClient MQTT library using the "Library Manager" in the Arduino IDE.

WiFi Connection and MQTT Settings:

#include <WiFi.h>
#include <PubSubClient.h>

const char* ssid = "WiFi_ADI";
const char* password = "WiFi_SIFRESI";
const char* mqttServer = "MQTT_SERVER_IP";
const int mqttPort = 1883;
const char* mqttUser = "MQTT_User_NAME";
const char* mqttPassword = "MQTT_SIFPRESS";

WiFiClient espClient;
PubSubClient client(espClient);

void setup_wifi() {
 // Perform WiFi connection
}

void reconnect() {
 // Reconnect to the MQTT server
}

void setup() {
 // Set WiFi and MQTT settings
 // You can add sensor or relay settings
}

void loop() {
 if (!client.connected()) {
  reconnect();
 }
 client.loop();
  
 // You can get your data from sensors and send it via MQTT
 client.publish("topic", "data");
 delay(5000); // wait 5 seconds
}
void loop() {
 if (!client.connected()) {
  reconnect();
 }
 client.loop();
  
 // You can get your data from sensors and send it via MQTT
 client.publish("topic", "data");
 delay(5000); // wait 5 seconds
}

This basic code example connects your ESP32 board to your WiFi network and sends data to the MQTT server. You can customize the code to suit your project. Please tings according to your network and server.