Bluetoothbatterymonitor22001zip

| Issue | Possible fix | |-------|---------------| | No devices found | Ensure BLE is on and devices are advertising. Restart Bluetooth stack. | | Battery shows “Unknown” | Device may not support Battery Service – check compatibility. | | Permission errors | Run as administrator (Windows) or add user to bluetooth group (Linux). |

Once I flashed the firmware to a $5 microcontroller and connected it to a 12V LiFePO4 battery, the monitor displayed:

If you wanted a .zip with software/firmware for a custom Bluetooth battery monitor, consider building one with open-source components. bluetoothbatterymonitor22001zip

The 22001 in the filename seems to denote a specific hardware revision that fixes the deep sleep bug from version 2.1. Previous monitors drained a 2000mAh battery in 3 days. This version draws only 12µA when idle. That means you can leave it attached to a parked car battery or a solar shed setup for months. | Issue | Possible fix | |-------|---------------| |