[arduino code examples for B16M]-11 digital INPUT trigger OUTPUT directly

Code:
/*

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

 *

 * This program reads 16 input states from a PCF8575 I/O expander and 

 * controls a corresponding 16-channel relay module. When an input pin 

 * is LOW, the corresponding relay is turned ON (LOW means ON for the relay).

 * When the input pin is HIGH, the corresponding relay is turned OFF.

 *

 * Pin Definitions:

 * - SDA: GPIO 38

 * - SCL: GPIO 39

 * - Input I2C Address: 0x24

 * - Relay I2C Address: 0x25

 */



#include <Wire.h>        // I2C communication

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



// Define I2C pins

#define SDA 38           // SDA pin

#define SCL 39           // SCL pin



// I2C addresses

#define INPUT_I2C_ADDRESS 0x24   // I2C address for the input PCF8575 module

#define RELAY_I2C_ADDRESS 0x25   // I2C address for the relay PCF8575 module



PCF8575 pcf8575_IN(INPUT_I2C_ADDRESS);    // Create an object for the input PCF8575

PCF8575 pcf8575_RL(RELAY_I2C_ADDRESS);    // Create an object for the relay PCF8575



void setup() {

  // Initialize I2C communication

  Wire.begin(SDA, SCL);

  

  // Initialize serial communication

  Serial.begin(115200);

  

  // Initialize input and relay modules

  pcf8575_IN.begin();

  pcf8575_RL.begin();

  

  // Turn off all relays at the start

  for (int i = 0; i < 16; i++) {

    pcf8575_RL.write(i, LOW);  // Assuming relays are LOW when OFF, setting all relays to OFF initially

  }

  

  Serial.println("System started: Input state controlling 16 relays");

}



void loop() {

  uint16_t inputState = 0;



  // Read the state of 16 inputs

  for (int i = 0; i < 16; i++) {

    if (pcf8575_IN.read(i)) {

      inputState |= (1 << i);  // If input is HIGH, set the corresponding bit

    } else {

      inputState &= ~(1 << i); // Otherwise, clear the corresponding bit

    }

  }

  

  // Control the relays based on the input state

  for (int i = 0; i < 16; i++) {

    if (inputState & (1 << i)) {

      pcf8575_RL.write(i, HIGH);  // If input is HIGH, turn the relay OFF

    } else {

      pcf8575_RL.write(i, LOW);   // If input is LOW, turn the relay ON

    }

  }



  // Delay for 500 milliseconds

  delay(500);

}