//led blinking
const int ledPin =5;
void setup() {
  // put your setup code here, to run once:
pinMode (ledPin, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite (ledPin, HIGH); //turn on LED
delay(100); // this speeds up the simulation
digitalWrite (ledPin, LOW); //turn off LED
delay(1000); // this speeds up the simulation
}