Problem with Arduino Leonardo

Development Tools IDE 2.x
1

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

2

Hi @alx10m. I'll provide instructions you can follow to work around this problem:

  1. Disconnect the USB cable of the Arduino board from your computer.
  2. Open the sketch you want to upload.
  3. Select the appropriate board from Arduino IDE's Tools > Board menu.
  4. Hold down the reset button on your Arduino board.
  5. Connect the Arduino board to your computer with a USB cable.
  6. Select Sketch > Upload from the Arduino IDE menus.
  7. Watch the black output panel at the bottom of the Arduino IDE window until you see some output of this form:
    Sketch uses 3462 bytes (12%) of program storage space. Maximum is 28672 bytes.
Global variables use 149 bytes (5%) of dynamic memory, leaving 2411 bytes for local variables. Maximum is 2560 bytes.
  8. Immediately release the reset button

The upload should now complete successfully.

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.

4

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 Razer Cobra Pro.

5

You are welcome.

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 the subject of your new question.

pert 6

@alx10m has now created the dedicated topic for the new problem they encountered:

Please use that topic for all discussion of the USB host problem. Further discussion of the out of control keyboard emulation problem is welcome here.