The micro:bit on the front acts as a user interface. Between signals, it turns off the LEDs to save power. Push the A button to signal LEFT, B for RIGHT, and both buttons for STOP. When you do, it sends a radio signal to the back of the bike.
The module on the back (in a cute little guy housing) responds by displaying everything to the people behind you!
Both of them have 3D-printed enclosures.
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