[arduino code examples for B16M]-01 Turn ON/OFF OUTPUT

Code:
/*

 * Made by KinCony IoT: https://www.kincony.com

 *

 * This program controls a 16-channel relay board via a PCF8575 I/O expander.

 * It sequentially turns on each relay and then turns them off in a loop.

 * 

 * Pin Definitions:

 * - SDA: GPIO 38

 * - SCL: GPIO 39

 * 

 * Delay Time:

 * - 200 milliseconds between switching relays

 */



#include <Wire.h>        // Include the Wire library for I2C communication

#include <PCF8575.h>     // Include the PCF8575 library to control the I/O expander



#define SDA 38           // Define the SDA pin

#define SCL 39           // Define the SCL pin

#define DELAY_TIME 200   // Define the delay time in milliseconds



// Set I2C address of the PCF8575 module

#define I2C_ADDRESS 0x25 // I2C address of the PCF8575 module



PCF8575 pcf8575_R1(I2C_ADDRESS); // Create a PCF8575 object with the specified I2C address



void setup() {

  // Initialize I2C communication

  Wire.begin(SDA, SCL); // SDA on GPIO 8, SCL on GPIO 18 (according to your board's configuration)

  

  // Initialize serial communication for debugging (optional)

  Serial.begin(115200);

  Serial.println("PCF8575 Relay Control: Starting...");



  // Initialize the PCF8575 module

  pcf8575_R1.begin();



  // Turn off all relays initially (set all pins HIGH)

  for (int i = 0; i < 16; i++) {

    pcf8575_R1.write(i, HIGH); // Set all relays to OFF (assuming HIGH means OFF for relays)

  }

}



void loop() {

  // Sequentially turn on each relay

  for (int i = 0; i < 16; i++) {

    pcf8575_R1.write(i, LOW);   // Turn on the relay at pin i (LOW means ON for the relay)

    delay(DELAY_TIME);          // Wait for DELAY_TIME milliseconds

  }



  // Sequentially turn off each relay

  for (int i = 0; i < 16; i++) {

    pcf8575_R1.write(i, HIGH);  // Turn off the relay at pin i (HIGH means OFF for the relay)

    delay(DELAY_TIME);          // Wait for DELAY_TIME milliseconds

  }

}