int Ldr = A1;
int sensorValue = 0;
int magnet = 0;
bool cycle = true;
bool geefAfstand = FALSE;
double distance = 0;

void setup() {


pinMode(D0, OUTPUT); // D0 is de LED
pinMode(D1, INPUT);  // D1 is de resetknop
pinMode(D4, INPUT);  // D4 is de Hall
Particle.variable("LDR-sv", sensorValue);
Particle.variable("distance", distance);
Serial.begin(9600);
}

void loop() {
 distance = 7.5 * 3.14 * magnet;    
 sensorValue = analogRead(Ldr)   ;
 if (sensorValue > 3700){
     digitalWrite(D0, HIGH);
     if (geefAfstand == TRUE){
        
        Serial.println(distance);
        Serial.println(geefAfstand);
        Particle.publish("depth", String(distance));
        geefAfstand = FALSE;
        delay(250);
     }
 }
     else (
         digitalWrite(D0, LOW));
         
         
         
    if (digitalRead(D4)==HIGH){
        

        if (cycle == FALSE){
            magnet += 1;
            cycle = TRUE;
            delay(100);
            distance = 7.5 * 3.14 * magnet;
            Particle.publish("diepte",String(distance));
            Particle.publish("LDR-sv", String(sensorValue));
             Serial.println(distance);
        }
    }
    if (digitalRead(D4)==LOW){
        
        if (cycle == TRUE){
            magnet += 1;
            cycle = FALSE;
            distance = 7.5 * 3.14 * magnet;
             Particle.publish("diepte",String(distance));
             Particle.publish("LDR-sv", String(sensorValue));
             Serial.println(distance);
            delay(100);
        }
    }
    if (digitalRead(D1)==HIGH){
        magnet = 0;
        distance = 0;
         Serial.println(sensorValue);
         delay(250);
         geefAfstand = TRUE;
    }
 
}