Code:
// Made by KinCony IoT: https://www.kincony.com
#include <Wire.h> // Include I2C communication library
#include <PCF8575.h> // Include PCF8575 library
#define SDA_PIN 8 // I2C SDA pin
#define SCL_PIN 18 // I2C SCL pin
#define RELAY1 14 // Relay 1 (PCF8575 CH15)
#define RELAY2 15 // Relay 2 (PCF8575 CH16)
#define I2C_ADDRESS 0x22 // I2C address of PCF8575
PCF8575 pcf8575(I2C_ADDRESS); // Create PCF8575 object
void setup() {
Wire.begin(SDA_PIN, SCL_PIN); // Initialize I2C bus
Serial.begin(115200);
Serial.println("PCF8575 Relay Control: Starting...");
pcf8575.begin(); // Initialize PCF8575
// Initialize relay state, default OFF (HIGH)
pcf8575.write(RELAY1, HIGH);
pcf8575.write(RELAY2, HIGH);
Serial.println("All relays are OFF");
}
void loop() {
Serial.println("Turning Relay 1 ON");
pcf8575.write(RELAY1, LOW); // Turn ON relay 1
delay(2000);
Serial.println("Turning Relay 1 OFF");
pcf8575.write(RELAY1, HIGH); // Turn OFF relay 1
delay(2000);
Serial.println("Turning Relay 2 ON");
pcf8575.write(RELAY2, LOW); // Turn ON relay 2
delay(2000);
Serial.println("Turning Relay 2 OFF");
pcf8575.write(RELAY2, HIGH); // Turn OFF relay 2
delay(2000);
}
