49E linear Hall sensor and Arduino

LEVEL: BEGINNER

I bought linear Hall sensors for a project and since this is the first time I've used those, decided to test them first.

 To sum it up: they are small(4.1 mm x 3 mm x 1.6 mm) and very simple to use (datasheet).

Connect Vcc to Arduino's 5V (actually it can take 2.7-6.5 V) and middle pin to ground and it's ready to go. Output pin should be around 2.5V and will change linearly with magnetic field. For a simple test you can connect the output pin to A0 on Arduino and load a following code:

const int hall = A0;
void setup() {
  pinMode(hall, INPUT);
  Serial.begin(9600);
}
void loop() {
  int sum = 0;
  for(int i = 0; i < 10; i++){        //averaging loop to reduce noise      int value = analogRead(hall);
      sum += value;
  }
  sum = sum / 10;
  Serial.print("hall = ");
  Serial.print(sum);
  Serial.print("\n");
  delay(100);
}

Start serial monitor (in Arduino IDE you can find it under "Tools" menu) and you will see a steady stream of values coming from the Hall sensor. Take a magnet and approach the sensor and you should observe the value changing. It's as simple as that :)