On Sun, 2017-01-29 at 08:47 -0500, Gene Heskett wrote: > Greetings everybody; > > I am in the process of bringing a nearly 70 yo Sheldon lathe back to > life, useing an raspberry-pi 3b for the machine controller. > > However, I have now had 5 different keyboards plugged into it, some > wired, some wireless, and none of them can give me a dependable response > to a key, and the error seems much worse for the key-up event. When > driving the machine by hand as we often do for one-offs, missing a keyup > event can be disastrous for the part being made because it keeps on > cutting until you've given that, or another key, a quick tap to stop the > unwanted motion.
I'm wondering if the problem is noise on the power, or RFI noise being picked up/interfering with the usb cable and/or PI in general. I'm guessing that the lathe is probably kicking out a shed load of RF noise into the air or on to the power line and the pi is not overly hardened for such a harsh environment. Another possibility is that they keyboard/pi is working ok, but the pi>lathe is where the problem is. The only way to tell would be to some how have the application give a visual indication of the keys pressed state so you would know if the pi had even seen the key released event. > > There is something funkity in the usb keyboard handling that can get much > worse with a reboot, or get almost perfect with a reboot. > > Its all uptodate a/o yesterday. The psu is a 4 amp box, making 5.07 volts > solidly. Verified with a 100 Mhz scope. > > What can I do to fix this? > > Cheers, Gene Heskett
