M5GO Motion Sensor, how it work ?

  • Hello, everyone,

    I have a new M5Stack, the M5Stack GO starter kit. It includes a motion sensor, and I would like to use it. I've read the instructions and connected the motion sensor to the black port, where G26 is for IN/OUT and G36 is for input.

    When I execute this code:

    #include <M5Stack.h>
    #define SENSOR_PIN 26
    #define RELAY_PIN 36
    void setup() {
      pinMode(RELAY_PIN, OUTPUT);
      pinMode(SENSOR_PIN, INPUT);
      M5.Lcd.println("I am on");
    void loop() {
      M5.Lcd.println("Checking for presence");
      int SensorValue = digitalRead(SENSOR_PIN);
      if (SensorValue == HIGH) {
        digitalWrite(RELAY_PIN, LOW);
        M5.Lcd.println("Movement detected");
      } else {
        digitalWrite(RELAY_PIN, HIGH);
        M5.Lcd.println("No movement");
      delay(1000); // Add a delay in milliseconds (e.g., 1000ms) to control how often you check the sensor.

    My sensor constantly writes 'no movement.' I think I haven't correctly defined the pin. What can I do to activate my motion sensor and have it write when it detects movement?

    Thank you for your valuable advice!

  • Hello @Recyclosaucisse

    you already described it correctly: G26 can be IN or OUT; G36 is IN only.

    Your defines need to be swapped: SENSOR_PIN 36 and RELAY_PIN 26.