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 11
* - SCL: GPIO 12
* - 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 11 // SDA pin
#define SCL 12 // 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
}
}
Serial.println("Test Point...");
// 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);
}
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