Printed Circuit Boards and Android: A Love Story Between Two Engineering Disciplines
summary
A custom die with LEDs, three PCB iterations (SMD failed, through‑hole succeeded) proves the workflow: design in EasyEDA → JLCPCB, program a USB‑C Xiao microcontroller with CircuitPython for fast iteration, and control LEDs via simple string protocol over CDC serial. Android uses UsbManager to find the right interface and endpoint, request permission with a broadcast PendingIntent, then send bytes with bulkTransfer; Kotlin + Jetpack Compose drives the UI. Pixel 3A on Android 12 showed a device stability quirk.
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chapters (6)
- 0:00Introduction and story
- 3:51From breadboard to PCB
- 9:49Firmware and Circuit Python
- 13:21Android communication setup
- 22:34Demo and future possibilities
- 25:44Closing and Q&A
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