Ampel

int greenled = 2; //Led's and pins
int yellowled = 3;
int redled = 4;

void setup()
{
pinMode(greenled, OUTPUT); //Pinmodes of the leds
pinMode(yellowled, OUTPUT);
pinMode(redled, OUTPUT);
}

void loop()
{
digitalWrite(greenled, HIGH); //Green on for 5 seconds
delay(5000);
digitalWrite(greenled, LOW); //Green off, yellow on for 2 seconds
digitalWrite(yellowled, HIGH);
delay(2000);
digitalWrite(yellowled, LOW); //yellow off, red on for 5 seconds
digitalWrite(redled, HIGH);
delay(5000);
digitalWrite(yellowled, HIGH); //Yellow and red on for 2 seconds
delay(2000);
digitalWrite(redled, LOW); //Red and Yellow off
digitalWrite(yellowled, LOW);
}