Devlog #6 – HydraCoaster
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Today, I setup HydraCoaster with BLE and made a full-fledged iOS app! The whole reminder system is now onboard: sip detection, automatic zero-drift correction, and self-timed buzz reminders now run on the ESP32 with no computer anywhere. Sips get logged to flash and served over a custom BLE service: live weight streaming, history backfill, time sync, calibration commands, battery. The product build is BLE-only, but a dev build keeps WiFi OTA so reflashing stays cable-free.
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The app has a sixty-second onboarding (pair + set a goal), Today screen with a goal ring and live weight, 14-day history chart, Settings with sound/light/reminder toggles, buzz test, notification test, reset data button, and a guided recalibration flow. Sips sync into SwiftData, write to Apple Health with their real timestamps, and the phone mirrors the coaster’s reminder as a local notification.