How can I add a LED to this build?

Question

I recreated this project from Fritzing in my circuits.io project then on the arduino itself, it all works fine just how I wanted it.

The concept behind it is:

1. You plug it in and the time is set to 00:00

2. You can adjust the time to the time now let's say 22:46

3. You can put in an alarm to wake up let's say an hour later at 23:46

4. The piezo beeps in stops, so not continious.

So now my question is, how can I add a led that flickers on the same rhythm as the piezo (when the alarm goes off)? Can someone help me in my circuits.io project?

An update/edit would be great! I'm relatively new to all of this.

Thanks a lot!

Answer 1

• You need to add an LED and series resistor between a currently unused Arduino pin and ground.

• In your setup() function, set that pin's i/o mode to OUTPUT.

• Where the code turns the tone on, it should also make the LED pin HIGH.

• Where the code turns the tone off, it should also make the LED pin LOW.