STM8S Car 12V Battery Charger Voltage Logging

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 Car 12V  Battery smart charger voltage logging is useful, when you want to know charged capacity and battery state of charge.

Connecting this wireless logger to 12 V battery can also check real battery voltage during start, off and driving.

Battery connected on 12V Smart Charger (3A , 0.8 A , 0.1A):



Hardware was done with STM8S103 module and HM-10 Bluetooth Low Energy module.


Charger logger schematic diagram done with KiCad:
























Also KiCad design files are included. KiCad 3D images shown here (did not order PCB):























Prototype images including 3D printed covers:



























STM8S module firmware was developed with ST Visual Studio and COSMIC C compiler.
Debugging interface was ST Link V2.

Android apk was developed with Android Studio. Application displays battery voltage (current,maximum,minimum) and logged battery voltage (intervals: 1 second, 1 minute, 6 minutes ):



KiCad project , ST Visual Studio Project and Android apk can be downloaded from GitHub:


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