A brighter desk makes tapping work

Change what the projector puts on the desk

The old dashboard had a dark background. On a regular display that is a visual choice; on this desk it also changes how much projected light reaches the hand the camera needs to track.

I load a brighter version and lower the desk light during the test. The video records the interaction improving under those conditions. It is an observation from this setup, rather than proof that the same lighting will suit every camera or room.

Try a gesture that had previously failed

I had moved toward pinching because tapping had failed so often. In this test, taps begin responding. That changes what seems practical to try next: the projected desk may support direct fingertip interaction as well as pinches.

The important check is the dashboard reacting to the action. Seeing the hand in a camera preview is useful for diagnosis, but it is not the same as successfully using a control.

What still needs checking

Changing brightness is not a complete calibration procedure. The next full-setup test still struggles with grabbing a card and keeping it under control. The later calibration work addresses where the fingertip maps onto the projected surface.