Build your circuit in this order: power, Bluetooth, bar graph.
Connect your circuit to your phone by using Bluetooth. To control your circuit, use the button control.
Put your circuit in a different room. Repeat all these steps so the person in the other room can silently communicate with you.
Print out a Morse Code key if you haven't ever memorized one. if you want, you can grab a writing utensil and paper so you can write down the dots and dashes, so you can translate them after. If you get really good at it, you can just write down the letters as you see the flashes of light.
Play! If you want to make it harder, do it on your own or try the challenges below:
Challenge 1: decorate!
Challenge 2: can you make up your own language?
Challenge 3: can you communicate in Morse Code using sound instead of light?