FNIRSI GC-01: EMI activates keyboard

[alfmck]

After flashed radpro I noticed that when my GC-01 is in measurement state, time by time it enters in MODE state.
I checked the signals on buttons wires with oscilloscope and saw that the short pulses to ground induces from high voltage generator. The biggest of them were on MODE button wire. It looks that the button state scanning algorithm sometimes detects these pulses as the MODE button was pressed. My GC-01 has a H614 tube soldered nearby this button. Maybe there was defect in pin9 of CH32F103R8T6 that after trying physically filter that pulse, pin9 on MC became faulty. So, I'm going to reprogram radpro, making button UP to fulfill MODE button function. Thank Gissio that You supplied distributives.

[Gissio]

Oh my, the dreaded EMI.

Can you post a screenshot or photo of what you see on the oscilloscope? Does this also occur with the original firmware? Did you try adding shielding?

IMHO this should be solved at the software level. But for that I would need to know what the spikes look like.

[alfmck]

The bin i1uo9h0rqvzg01v6 was created

[Gissio]

That's greatly helpful.

Can you tell me what time scale you used? I would need to know how long the pulses are!

[alfmck]

15mks/cm for factory default, 7mks/cm for custom setting

[Gissio]

alfmck: that was extremely helpful. Thank you so much for all your effort!

[alfmck]

One more experiment: The induction field (probe close to button SETTINGS/RIGHT in the first part of video and close to the button UP on the end of the video). The scales are 0.5V/cm, 10mks/cm.
The bin 4ibejqxch2fxo267 was created

[Gissio]

I think I've read somewhere about a similar problem.

Can other users report?

[alfmck]

I've a bit corrected a soft and solved the problem by making the UP key to work as SETTINGS/RIGHT key.