Battery
Connect the Arduino, insert a Makita LXT pack and read everything in one go.
Connect your Arduino
The OBI firmware must already be flashed (Flash tab). Use Chrome or Edge on desktop.
Web Serial isn’t available
Open this page in Chrome or Edge on desktop, over HTTPS.
Battery status
–
Insert a battery and press Read battery.
–Est. charge
Actions
Identity
ROM ID–
Balance vs lowest cell
Battery message–
Cells
Waiting for a readingModel–
Pack voltage–
Charge count*–
Capacity–
Cell sensor–
MOSFET sensor–
Highest cell–
Lowest cell–
Cell spread–
Status code–
Built–
Balance–
Flash
Install the OBI firmware on an Arduino Uno / Nano or ESP32-C3 straight from the browser.
1Plug in
2Flash
3Done
Ready. Plug in your board and press the button.
Advanced
Uses the bundled firmware from firmware/uno.hex, built from the ArduinoOBI source.
Guide
This tool talks to battery BMS hardware. Use at your own risk.
- Flash the firmwareOpen the Flash tab, pick your board and flash. Unplug and replug it afterwards.
- ConnectPress Connect and choose the board’s serial port. The OBI firmware runs at 9600 baud.
- Read the packInsert the battery so the pins make contact, then press Read battery.
- Locked pack?If State shows LOCKED, press Unlock battery, then read again.