@felmue

Thanks for the help! I've got it working now :)

Good morning! I am trying to perform a simple test by flashing the LEDs and cycling the relays on a 4-relay unit board, and for some reason, the magic isn't happening, below is my code:

#include <M5Core2.h>
#include "Unit_4RELAY.h"


UNIT_4RELAY relay;

void setup() {

  // Init M5Core2 And the I2C port(21,22).
  M5.begin(true,false,true,true);             

 // Draw screen
  M5.Lcd.setCursor(0, 10);
  M5.lcd.setTextSize(2);
  M5.lcd.setTextColor(GREEN);
  M5.Lcd.printf("Hello World!");

  // Relay
  relay.Init(1);

      
  
  
}

void loop() {


     relay.relayAll(1);
     relay.ledAll(1);

     delay(2500);

     relay.relayAll(0);
     relay.ledAll(0);
}

Any reason as to why this wouldn't work? The device is plugged into Port A on the M5Core2. Additionally, using wire scan, I am able to detect the device successfully on the I2C bus. I based my code off of this:

https://github.com/m5stack/M5Unit-RELAY/blob/master/examples/Unit_4RELAY_M5Core2/Unit_4RELAY_M5Core2.ino

Additionally, this is the specific module I am using:

https://shop.m5stack.com/products/4-relay-unit

Thanks in advance!