2018-03-05, 05:23 PM
Another thing to check is your power supply to the Pi especially if it is a Pi 3. If it draws a lot of power for some reason such as CPU load then it can starve the USB power and cause the voltage to sag. you need a really clean stable source that can provide a minimum 3 amps because most are switching regulators and when you start hitting 75% of their rated power the output can look like everything but DC and will have a lot of AC noise or switching spikes on it that can cause all sorts of weird problems and glitches
I built one of these for my boat
https://www.amazon.com/Handheld-Pocket-s...oscope+kit
And although it doesn't have a very high bandwidth it does have enough for check for noise on DC power lines as well as checking NMEA 0183 and NMEA 2000 data lines and other things a multimeter just can't do .... I'm an Electrical Engineer and have "real" o-scopes but for the price you really can't beat this device. I would have loved having something like that 40+ years ago when I was starting out in electronics. For the folks that aren't handy for a little bit more you can buy one that's already assembled but if you even have the most basic of soldering skills this kit is easy to do and I have helped kids as young as 12 put them together in a Mentoring Program I'm part of
I built one of these for my boat
https://www.amazon.com/Handheld-Pocket-s...oscope+kit
And although it doesn't have a very high bandwidth it does have enough for check for noise on DC power lines as well as checking NMEA 0183 and NMEA 2000 data lines and other things a multimeter just can't do .... I'm an Electrical Engineer and have "real" o-scopes but for the price you really can't beat this device. I would have loved having something like that 40+ years ago when I was starting out in electronics. For the folks that aren't handy for a little bit more you can buy one that's already assembled but if you even have the most basic of soldering skills this kit is easy to do and I have helped kids as young as 12 put them together in a Mentoring Program I'm part of