const int lread = 6;
const int lgreen = 8;
const int lyellow = 7;
const int ltime=100;
// the setup function runs once when you press reset or power the board
void setup() {
// initialize digital pin LED_BUILTIN as an output.
pinMode(LED_BUILTIN, OUTPUT);
pinMode(lread, OUTPUT);
pinMode(lgreen, OUTPUT);
pinMode(lyellow, OUTPUT);
}
// the loop function runs over and over again forever
void loop() {
digitalWrite(lread, HIGH);
delay(ltime);
digitalWrite(lread, LOW);// wait for a secon
delay(ltime);
digitalWrite(lgreen, HIGH);
delay(ltime);
digitalWrite(lgreen, LOW);
delay(ltime);
digitalWrite(lyellow, HIGH);
delay(ltime);
digitalWrite(lyellow, LOW);
delay(ltime); // wait for a second
}