#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);
}