09-27-2024, 02:19 AM
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
}
}
1-output.zip (Size: 931 bytes / Downloads: 34)
BIN file (you can use esp32 download tool download to ESP32-S3 with address 0x0 then directly to use) download:
1-output.ino.merged.zip (Size: 189.62 KB / Downloads: 37)