/*This program use hall sensor as digital input, which 
can measure magnetic field density*/

const int sensor = 5; //Associate hall sensor to digital pin 5
const int led = 13; //Associate LED to digital pin 13
 
void setup() {
  pinMode(led, OUTPUT); //Set led as OUTPUT
  pinMode(sensor, INPUT);//Set sensor as INPUT
}
 
void loop() {
  //If sensor equals HIGH state then led turn on.
  if(digitalRead(sensor)==HIGH)
  {
    digitalWrite(led, HIGH);   
  }
  else
  {
    digitalWrite(led, LOW);
  }
}