int hallSensorPin = 2;
int low_state = 400;
int high_state = 500;
int hall_thresh = 100.0;
int val = 0;

void setup() {
  Serial.begin(9600);
  pinMode(hallSensorPin, INPUT);
}
void loop() {
  int hall_count = 1;
  //float start = micros();
  bool state = false;
  while(true) {
   val = analogRead(hallSensorPin); 
        if (low_state < val && val < high_state) {
          if (state == false){
            state = true;
            hall_count+=1;
            Serial.write(hall_count);
            delay(50);
          }
        }
        else {
          state = false;
        }
      if (hall_count>=hall_thresh) {
        break;
      }
  }
  
  delay(1);
}