[Arduino Quiz] Sunflower

#include <Servo.h>

int sensorPin = A0;

int servoPin = 9;

int sensorValue = 0;

int servoGrad = 90;

int tolerance = 40;

Servo myservo;

void setup() {

pinMode( sensorPin, INPUT);

myservo.attach( servoPin );

myservo.write( servoGrad );

}

void loop() {

sensorValue = analogRead(sensorPin);

if ( sensorValue < (512-tolerance) )

{

if (servoGrad < 180) servoGrad++;

}

if ( sensorValue > (512+tolerance) )

{

if (servoGrad > 0) servoGrad--;

}

myservo.write( servoGrad );

delay(100);

}