In this activity, students use their knowledge of coding to create a system that can send and receive radio signals. Students then encode a message into the signal that can be decoded by other students. Materials Programmable microcontroller (e.g., Micro:Bit or Arduino) Radio transmitter and receiver for microcontroller Input device (e.g., button or switch) Output device (e.g., LEDs or a speaker) Thin materials to test signal blocking capabilities (e.g., paper, plastic, cloth, aluminum foil, et