HP 15c CE - New firmware update officially available!

[Radim Frydrych]

(07-25-2024 01:03 PM)chromos Wrote:  Thank you very much for official update!

I've been testing the new firmware for several hours now and so far no key bouncing. So maybe the 120 ms will be enough to solve the problems with the keyboard (100 ms in the unofficial firmware was much better than the original one, but not enough).

By the way, what kind of keyboard is it that even 100 ms is not enough for debouncing? My experience with buttons from various manufacturers is that the wobble lasts up to 5 ms max (measured with an oscilloscope) and in my projects I have debouncing set to 10 ms and in years of use no key bouncing.

The 15c uses the same keyboard as the 12c, and we haven't noticed any major keyboard problems with it over the past few years.

We have received a few complaints about keyboard issues, but have not been able to collect enough samples to send to the factory to verify that this is indeed a HW issue.

I have also personally tested some of the returned calculators, and most have passed the keyboard test. I have 1-2 calculators on hand that have real keyboard problems, but unfortunately that is not enough to start the process with the factory. Also, we are not getting any major complaints from our resellers on this issue.

Radim