reed.c

int pinReed = 2;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(pinReed, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  if(digitalRead(pinReed)) {
    Serial.println("Mini Reed OFF");
  }
  else {
    Serial.println("Mini Reed ON");
  }
  delay(500);
}