Flash the firmware

One click to put the Open Battery Information firmware on your Arduino — no IDE needed.

1Plug in

2Flash

3Done

Your board

Arduino Uno ATmega328P · optiboot @ 115200 baud ESP32-C3 SuperMini · esptool @ 115200 baud

Ready. Plug in your Arduino and press the button.

Advanced

Firmware image

Bundled firmware Custom .hex file

Uses firmware/uno.hex from this site, built automatically from the ArduinoOBI source.

Log

Works in Chrome, Edge, Opera or Firefox on desktop, over HTTPS or localhost. If something goes wrong, open Advanced for the full log.