M5GO Motion Sensor, how it work ?

[Recyclosaucisse]

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);
  Serial.begin(9600);
  M5.begin();
  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");
    delay(500);
  } 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!

[felmue]

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.

Thanks
Felix