Unit Relay Arduino Tutorial

1. Preparation

• 1. Environment Setup: Follow the Arduino IDE Getting Started Guide to complete the IDE installation, and install the necessary board manager and required driver libraries based on the development board you are using.
• 2. Libraries Used:
  • M5Unified
  • M5GFX
• 3. Hardware Products Used:
  • CoreS3
  • Unit Relay

2. Example Program

#include <M5Unified.h>

#define RELAY_PIN 9

bool relay_no_status = false;

void setup()
{
    M5.begin();
    M5.Display.setFont(&fonts::FreeMonoBold12pt7b);
    pinMode(RELAY_PIN, OUTPUT);
    digitalWrite(RELAY_PIN, LOW);
    M5.Display.setCursor(10, 40);
    M5.Display.println("Relay NO & COM Open");
}

void loop(void)
{
    M5.update();
    auto t = M5.Touch.getDetail();

    if (t.wasClicked() || M5.BtnA.wasClicked()) {
        relay_no_status = !relay_no_status;
        if (relay_no_status) {
            M5.Display.clear();
            M5.Display.setCursor(10, 40);
            M5.Display.println("Relay NO & COM Closed");
            digitalWrite(RELAY_PIN, HIGH);
        } else {
            M5.Display.clear();
            M5.Display.setCursor(10, 40);
            M5.Display.println("Relay NO & COM Open");
            digitalWrite(RELAY_PIN, LOW);
        }
    }
}

3. Compile and Upload

• 1. Download Mode: Different devices may require entering download mode before programming. The steps for this may vary depending on the main control device. For more details, refer to the Arduino IDE Getting Started Guide , which includes specific download tutorial lists for each device.

• For CoreS3, press and hold the reset button (for about 2 seconds) until the internal green LED lights up, and then release it. This indicates the device is in download mode and ready for programming.

• 2. Select the device port and click the compile and upload button in the top left corner of Arduino IDE, then wait for the program to compile and upload to the device.

4. Switch Control

The Unit Relay switch can be controlled through the touchscreen, enabling load power control.