[arduino code examples for A32 Pro]-01 Turn ON/OFF relay

Code:
/*

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



  Program functionality:

  This program uses ESP32-S3 to control two PCA9555 I/O expander chips via I2C, 

  controlling a total of 32 relays. The first PCA9555 chip has an I2C address of 0x21 

  and controls relays 1-16, while the second PCA9555 chip has an I2C address of 0x22 

  and controls relays 17-32.



  The relays are turned ON (set to low) and OFF (set to high) in sequence with a small 

  delay between each operation. The program reads and prints the current state of the 

  relays to the serial monitor after each change.

*/



#include <PCA95x5.h>



// Initialize two PCA9555 objects for controlling 32 relays

PCA9555 ioex1; // 1-16 relays (I2C address 0x21)

PCA9555 ioex2; // 17-32 relays (I2C address 0x22)



void setup() {

    // Start serial communication for debugging

    Serial.begin(115200);

    delay(10);



    // Initialize the I2C bus with GPIO 11 as SDA and GPIO 10 as SCL, 100kHz frequency

    Wire.begin(11, 10, 100000);



    // Configure the first PCA9555 chip (1-16 relays)

    ioex1.attach(Wire, 0x21);  // Set I2C address to 0x21

    ioex1.polarity(PCA95x5::Polarity::ORIGINAL_ALL);  // Set polarity to normal (no inversion)

    ioex1.direction(PCA95x5::Direction::OUT_ALL);  // Set all pins as output

    ioex1.write(PCA95x5::Level::H_ALL);  // Initialize all outputs to HIGH (relays OFF)



    // Configure the second PCA9555 chip (17-32 relays)

    ioex2.attach(Wire, 0x22);  // Set I2C address to 0x22

    ioex2.polarity(PCA95x5::Polarity::ORIGINAL_ALL);  // Set polarity to normal (no inversion)

    ioex2.direction(PCA95x5::Direction::OUT_ALL);  // Set all pins as output

    ioex2.write(PCA95x5::Level::H_ALL);  // Initialize all outputs to HIGH (relays OFF)



    delay(50);  // Wait for settings to take effect

}



void loop() {

    // Control the first PCA9555 chip (1-16 relays)

    for (size_t i = 0; i < 16; ++i) {

        Serial.print("set port low (chip 1): ");  // Turning ON the relay

        Serial.println(i);



        ioex1.write((PCA95x5::Port::Port)i, PCA95x5::Level::L);  // Set the relay to LOW (ON)

        Serial.println(ioex1.read(), BIN);  // Print the current state of all relays (in binary)

        delay(50);  // Small delay between each relay activation

    }



    // Control the second PCA9555 chip (17-32 relays)

    for (size_t i = 0; i < 16; ++i) {

        Serial.print("set port low (chip 2): ");  // Turning ON the relay

        Serial.println(i + 16);  // Display relay numbers 17-32



        ioex2.write((PCA95x5::Port::Port)i, PCA95x5::Level::L);  // Set the relay to LOW (ON)

        Serial.println(ioex2.read(), BIN);  // Print the current state of all relays (in binary)

        delay(50);  // Small delay between each relay activation

    }



    // Turn off the first PCA9555 chip (1-16 relays)

    for (size_t i = 0; i < 16; ++i) {

        Serial.print("set port high (chip 1): ");  // Turning OFF the relay

        Serial.println(i);



        ioex1.write((PCA95x5::Port::Port)i, PCA95x5::Level::H);  // Set the relay to HIGH (OFF)

        Serial.println(ioex1.read(), BIN);  // Print the current state of all relays (in binary)

        delay(50);  // Small delay between each relay deactivation

    }



    // Turn off the second PCA9555 chip (17-32 relays)

    for (size_t i = 0; i < 16; ++i) {

        Serial.print("set port high (chip 2): ");  // Turning OFF the relay

        Serial.println(i + 16);  // Display relay numbers 17-32



        ioex2.write((PCA95x5::Port::Port)i, PCA95x5::Level::H);  // Set the relay to HIGH (OFF)

        Serial.println(ioex2.read(), BIN);  // Print the current state of all relays (in binary)

        delay(50);  // Small delay between each relay deactivation

    }

}