When I connect the Arduino to the computer, the keyboard starts typing automatically without stopping! Any help.

Hi @alx10m . I'll provide instructions you can follow to work around this problem: Disconnect the USB cable of the Arduino board from your computer. Open the sketch you want to upload. Select the appropriate board from Arduino IDE's Tools > Board menu. Hold down the reset button on your Arduino boa…

Thank you But if you can help me for my mouse When I connect it, it doesn't move, even though I followed all the steps. I installed HID-Project by NicoHood, USB Host Shield 2.0, and Mouse by Arduino, but it's no use! I'm using an Arduino Leonardo with a host shield, and the mouse I'm using is a Ra…

You are welcome. [image] alx10m: if you can help me for my mouse When I connect it, it doesn't move Since it is unrelated to the original subject of this topic, please open a new forum topic for that question. This will ensure it gets the attention of the forum helpers knowledgeable about t…

Problem with Arduino Leonardo

Development Tools IDE 2.x

sterretje February 14, 2026, 5:13pm 3

To prevent some of the issues that you might encounter when using the Leonardo as a HID, you can read Pro Micro clone programmer error - #18 by sterretje.

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Problem with Arduino Leonardo

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