Controlling hardware in a week with Expo and EAS
summary
Builds a Bluetooth LE Modbus controller app in a week: 48 hours to reverse‑engineer the protocol from a vendor app, seven days to a working prototype, then ~350 hours of polishing with 60 beta testers. Uses Expo + EAS development client to include native modules, Reanimated2 for the dashboard, bleno for a mocked peripheral, and react-native-quick-sqlite (JSI) plus native charts to handle ~150 ms sampling and ~480k points per ride. Publishes via EAS auto submit; demo mode and CSV dyno export work.
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chapters (13)
- 0:00Introduction to bike modding
- 3:11Problem with stock controller
- 5:56Goals for the app
- 6:38Reverse engineering the protocol
- 10:27Bluetooth with Expo EAS
- 13:37Building the UI
- 15:40Live demo of Kilowatt
- 19:11Data logging and analysis
- 21:39Native libraries with EAS
- 24:55Voice control integration
- 27:20Config plugins for EAS
- 28:46Observability and beta testing
- 30:56Thanks and community impact
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