An open-source Android app for the BLE-YC01 Bluetooth water quality tester. Connects via BLE to read real-time sensor data and track water quality over time — ideal for swimming pools and hot tubs.

Features

* Live dashboard with real-time readings for pH, ORP, EC, TDS, Free Chlorine, and Temperature
* Battery status displayed in the navigation bar
* Percentage change shown on each parameter card based on recent history
* Temperature chart on the dashboard (last 5 hours)
* Pool and hot tub reference lines on all charts (ideal ranges for pH, ORP, Chlorine, TDS, Temperature)
* History screen with time-series charts for all parameters (5h, 10h, 2d, 7d, 14d)
* Configurable poll interval (default 4 min, max ~5 min before device auto-off)
* Configurable save interval for persisting readings to local database
* Temperature alert with notification when a target temperature is reached
* Auto-reconnect to the last paired device on app launch
* All data stays on your device (Room database) — no cloud, no tracking

Supported Device

Model: BLE-YC01 (6-in-1 Bluetooth Water Quality Tester)

This is a white-label device sold under several brand names including Yinmik, Yieryi, Eujgoov, ANKROYU, and RCYAGO. All variants use the same BLE protocol and are compatible with this app. Look for model name BLE-YC01 in the product listing.

Sensors

* pH: 0.1 – 14.0
* ORP: -1200 – +1200 mV
* EC: 0 – 20,000 uS/cm
* TDS: 0 – 9,990 ppm
* Free Chlorine: 0.1 – 4.0 mg/L
* Temperature: 0.1 – 80.0 °C

Device Notes

* Powered by 3x AAA batteries
* The device auto-powers-off after ~5 minutes without an active BLE connection
* Continuous polling drains batteries faster; at the default 4-minute interval, batteries should last several months