# i2c_scanner Aiming to provide a more qmk friendly version of <https://playground.arduino.cc/Main/I2cScanner/> > This very simple ~~sketch~~ keymap scans the I2C-bus for devices. If a device is found, it is reported to the ~~Arduino serial monitor~~ console. ## Flashing Pick a target that is aligned to the MCU you want to test: ```console make handwired/onekey/elite_c:i2c_scanner:flash # also 32u4 + dfu bootloader make handwired/onekey/promicro:i2c_scanner:flash make handwired/onekey/teensy_2:i2c_scanner:flash # ChibiOS is currently 'best effort' and might not report accurate results make handwired/onekey/proton_c:i2c_scanner:flash ``` others might work with additional configuration. ## Usage Output is viewable through a compatible tool <https://docs.qmk.fm/#/newbs_testing_debugging?id=debugging-tools>. You can change the wires, and plug-in I2C devices while the i2c_scanner is running. The output of the console will look like this: ``` Listening: Scanning... I2C device found at address 0x20 done ```