const int led = D6;
const int sensor_pin = A2;
int sensor;
const int threshold = 800;


void setup() {
  pinMode(led, OUTPUT);
  Serial.begin(9600);
}



void loop() {
  sensor = analogRead(sensor_pin);
  Serial.println(sensor);
  
  if (sensor < threshold) {
    digitalWrite(led, HIGH);
  } else {
    digitalWrite(led, LOW);
  }
}