ArduinoOBI

After you prepared the hardware (microcontroller), here is how to upload the ArduinoOBI firmware and get a working Makita dongle.

This YouTube video explains how to build the adapter and provides free 3D printing files for a matching enclosure.

Uploading Firmware to your Adapter

The original author and also the YouTube video uses the Arduino IDE to compile and upload the firmware to the Arduino Nano or UNO.

I prefer platform.io, so here is what I did:

1. download the ready‑to‑build PlatformIO ArduinoOBI project
2. Open the folder with the extracted content in VSCode.
3. In the VSCode platformio extension, click Build.

Manually Creating PlatformIO Project

In PlatformIO, create a new project and select your target microcontroller. Once the project is created, adjust it in the file explorer:

1. Open platform.ini and review the auto‑generated settings. For an Arduino Nano Clone, use:

    [env:nano_old]
    platform  = atmelavr
    board     = nanoatmega328
    framework = arduino
    upload_speed = 57600
   

2. In your browser, open Arduino OBI/main.cpp and copy the complete source code.
3. In VS Code, open src\main.cpp and replace its contents with the copied source.
4. In the VS Code Explorer, right‑click lib → New Folder and name it OneWire2.
5. In your browser, navigate to ArduinoOBI/lib/OneWire where you find OneWire2.cpp and OneWire2.h.
6. Open OneWire2.cpp, copy the source, then in VS Code create OneWire2.cpp inside the OneWire2 folder (exact file name and casing) and paste the code. Save the file.
7. Repeat the previous step for OneWire2.h.
8. In the Explorer, right‑click the OneWire2 folder → New Folder and name it util.
9. In your browser, navigate to ArduinoOBI/lib/OneWire/util, which contains OneWire_direct_gpio.h and OneWire_direct_regtype.h.
10. Copy OneWire_direct_gpio.h, then in VS Code create a file with the same name under OneWire2/util, paste the contents, and save.
11. Repeat for OneWire_direct_regtype.h.

Now everything is in place; in PlatformIO, choose Upload to build and flash the firmware onto your microcontroller.

Next Steps

To test drive your dongle, run the OpenBatteryInformation python script, or run a PowerShell script.

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