vacuum

Hello everyone, i have a roidmi eve plus with non spinning LDS(The sensor on top). The board you see is on the sensor assembly. I measure 5v coming to the board, and 2,3v on the pwm pin. The mosfet on the top left corner measures 2,3v on the gate and when i turn the vacuum on i have continuity...

I wanted to create a self cleaning device that could clean white boards. But the device would stay on the board through vacuum. But it should be one of a very small size. Any suggestions on how I can do that. My friend said that I should use magnets instead then the device would be driven by the...