#define LED  5
int threshold = 700;

void setup() {
  Serial.begin(115200);
  pinMode(LED, OUTPUT);
}

void loop() {
 float adc;
 adc = analogRead(0);

  if(adc>threshold)
  digitalWrite(LED, HIGH);
  else
  digitalWrite(LED, LOW);
  
Serial.println(adc);
delay(1000);
 }