开云体育

This thread discusses the thumbwheel switch.
/g/nanovna-users/topic/32796736
In post 869 of that thread, Hugen tells us where he buys the switch that the nanoVNA ships with
In post 1305 of that thread, Hugen recommends a better switch.

This thread discusses other options:
/g/nanovna-users/topic/34151142

And another:
/g/nanovna-users/topic/34166411

The thumbswitch is mechanically unreliable, mine often gets stuck.
One solution for this would be to drill out the front panel to take 3 button switches,
or fab a replacement using one of the many low cost board fab shops.
Drill a hole in the main nanoVNA board, run 3 wires plus ground from the thumbswitch
up to the three new button switches. No need to remove the old switch, the three pins
we are interested in are exposed.

I have a PCB with three button switches from some other gear,
may just glue the strip of three down to the top of the nanoVNA top panel.

But beyond the unreliable thumbwheel switch, we also have a software issue.
Seems the switches are polled, and if the ARM processor
is busy doing other stuff it may not see your switch action.
I'd think it should be interrupt driven, and simply bail out of processing the current crop
of data when the switch is pressed.

Jerry Gaffke, KE7ER