KY-035 Bihor magnetic sensor

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int sensorPin = A0;   // analog pin connected to the KY-035 signal (S) pin
int baseline;         // resting value with no magnet, measured at startup
int val;              // latest raw reading (0-1023 on Arduino)
int field;            // signed field strength: val - baseline

void setup() {
  pinMode(sensorPin, INPUT);   // set analog pin as input
  Serial.begin(9600);          // initialize serial interface

  // Measure the resting value with no magnet nearby by averaging 50 samples.
  // This becomes the "zero" the field strength is measured against.
  long sum = 0;
  for (int i = 0; i < 50; i++) {
    sum += analogRead(sensorPin);
    delay(5);
  }
  baseline = sum / 50;         // typically near 512 at 5V
}

void loop() {
  val = analogRead(sensorPin);   // read sensor value
  field = val - baseline;        // positive = one pole, negative = the other

  Serial.print("raw:");
  Serial.print(val);
  Serial.print('\t');
  Serial.print("field:");
  Serial.println(field);         // 0 at rest, swings + or - with a magnet

  delay(100);
}

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