/*  HALL SENSOR BOARD V.2.0
    code written by Giuseppe Allocca
    FabLab class 2018
    Santa Chiara FabLab SIena Italy
    */

//leds pins definition
int powerled = 3; //white led
int comled = 2;//blu led
int sensor= 16;
int sensor_value=0;
int pinsound=5;//digital pin



void setup() {
  // initialize serial:
  
  Serial.begin(9600,SERIAL_8N1);

  
   // initialize digital pin LED as an output and pin Button as input
  pinMode(powerled, OUTPUT);
  pinMode(comled, OUTPUT);
  pinMode(sensor, INPUT);
  pinMode(pinsound, OUTPUT);
  
    // turn LED on:
    digitalWrite(powerled, HIGH);//Board power-on 
    digitalWrite(comled,LOW);//comled off
  
 }// end void setup

void loop() {

    /*  activates serial transmission and blinking led blue 
        when sensor value if different then normal status */

// read the sensor value from pin 16
        
    sensor_value=analogRead(sensor);

// "or" operator to control low or high value change depending by polarity of magnet

        if ((sensor_value)>512||(sensor_value)<508)

//blue led blinking synchronized to sensor_value

                  {digitalWrite(comled,HIGH);delay(map((sensor_value),20,1023,1,10));digitalWrite(comled,LOW);delay(map((sensor_value),20,1023,1,10));

//remap value of sensor to 1-100 scale and send the value to serial port 

               Serial.println(map((sensor_value),200,875,1,100));
               

//sound zone
               digitalWrite(pinsound,HIGH);delay(map((sensor_value),50,500,1,50));//start beep
               digitalWrite(pinsound,LOW);//end beep

// the sound  are synchronized to sensor_value than blue led
                              } // end if

} //end void loop