STM8S Car 12V Battery Charger Voltage Logging

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12V Battery Charger Voltage Logging 


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):

Android app view charge monitor


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):

KiCad 3D view of charge monitor






















Prototype images including 3D printed covers:



























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 ):

Android app view for charger monitor


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


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