void setup() {  // initialises the program
   pinMode(D9, OUTPUT);//assign pin D10 as an output
   }
         
// the loop function runs over and over again forever
         
void loop() {  //runs program over and over until stopped
   digitalWrite(D9, HIGH); // turn the LED on
   delay(1000); // wait for one second
   digitalWrite(D9, LOW); // turn the LED off
   delay(1000);
   }