Idea: Use an infrared (IR) LED signal to send a coded message from one A3BU to another.
Process: We built an emitter that used the A3BU on board button to pulse an infrared LED. Another A3BU with a photoresistor circuit connected to it received the signal and translated it into a letter. For example, three short pulses would be ‘A’.
The video below shows an example of the project.