I am making a project where i have a contineous rotating servo, i need it to spin some laps , for that i used a photoresistor , when the photoresistor recieves a determinated amount of light the servo should move some laps and stay there until the photoresistor recieves another specific value.
This is my code:
#include <Servo.h>
int sensorluz = A0;
int LEDrojo = 2;
int LEDamarillo = 4;
Servo myservo;
int luz = 0;
int valordelsensor = 0;
const int speed0 = 0;
int i;
void setup() {
Serial.begin(9600);
pinMode (sensorluz, INPUT);
pinMode (LEDrojo, OUTPUT);
pinMode (LEDamarillo, OUTPUT);
myservo.attach(3);
{ valordelsensor = analogRead(sensorluz);
luz = (5.0 * valordelsensor * 100.0)/ 1024.0;
Serial.print (luz);
Serial.print ("luz");
delay (100);}
if (luz <= 120)
{
digitalWrite (LEDrojo, HIGH);
digitalWrite (LEDamarillo, LOW);
}
for(i = 0; i < 90; i++)
{
myservo.write(speed0 + i);
delay(15);
}
{ myservo.write(speed0);
delay(1000);}
if (luz >= 200)
{
digitalWrite (LEDrojo, LOW);
digitalWrite (LEDamarillo, HIGH);
}
for(int i = 0; i < 90; i++)
{
myservo.write(speed0 - i);
delay(1000);
}
{
myservo.write(speed0);
delay(100);
}
}
void loop() {
{ valordelsensor = analogRead(sensorluz);
luz = (5.0 * valordelsensor * 100.0)/ 1024.0;
Serial.print (luz);
Serial.print ("luz");
delay (100);}
if (luz <= 120)
{
digitalWrite (LEDrojo, HIGH);
digitalWrite (LEDamarillo, LOW);
}
for(i = 0; i < 90; i++)
{
myservo.write(speed0 + i);
delay(15);
}
{ myservo.write(speed0);
delay(1000);}
if (luz >= 200)
{
digitalWrite (LEDrojo, LOW);
digitalWrite (LEDamarillo, HIGH);
}
for(int i = 0; i < 90; i++)
{
myservo.write(speed0 - i);
delay(1000);
}
{
myservo.write(speed0);
delay(100);
}
}
The problem is that the servo dont stop spinning, I´ve try this with a normal servo & it works my code for that is:
#include <Servo.h>
int sensorluz = A0;
int LEDrojo = 2;
int LEDamarillo = 4;
Servo myservo;
int luz = 0;
int valordelsensor = 0;
void setup() {
myservo.attach(3);
Serial.begin(9600);
pinMode (sensorluz, INPUT);
pinMode (LEDrojo, OUTPUT);
pinMode (LEDamarillo, OUTPUT);
}
void loop() {
myservo.write (0);
valordelsensor = analogRead(sensorluz);
luz = (5.0 * valordelsensor * 100.0)/ 1024.0;
Serial.print (luz);
Serial.print ("luz");
delay (100);
if (luz <= 120)
{
digitalWrite (LEDrojo, HIGH);
digitalWrite (LEDamarillo, LOW);
myservo.write(180);
}
if (luz >= 200)
{
digitalWrite (LEDrojo, LOW);
digitalWrite (LEDamarillo, HIGH);
myservo.write(0);
}
}
I can´t find out the problem 
