Bluetooth Low Energy 12V Car Battery Voltage Logger

Car 12V Battery Voltage Logger If you are unsure about your car battery and charger capacity , you can use this diy battery logger in 12V plugin connector to measure it. For this logger I used STM8S103 module and HM-10 Bluetooth Low Energy module and Android Smartphone as displaying device. STM8S103 bluepill module: HM-10 BLE module Android application screenshot: Hardware schematic diagram drawn with KiCad: STM8S103 Firmware was developed with ST Visual Studio with COSMIC C compiler in Windows PC. ST Link V2 as programming /debugging interface. Kicad 3D images of project hardware: And actual prototype images: Android application screenshots of battery voltage logging: Project files for KiCad , ST Visual Studio and Android apk to download: https://github.com/joukohak/batlog