I’m asking here because if you aren’t a member of these forums, I don’t trust your opinion (not entirely true, I do trust my wife).
I have a couple of “touchless” trash cans that use a motion sensor to detect a hand motion or whatever and then opens the trash can lid. They worked great for a while, but eventually took on a life of their own and opened whenever the heck the felt like it. Whether someone was in the room or not, it would sporadically open every few seconds or every few hours. Just random. Since both trash cans sit within inches of an outlet, I figured I could put a Spark Core in each one powered by USB to replace the brains. I had to make a better use case for it, so I decided I wanted to stick some DHT22 sensors in them to get environmentals (outside, not inside) and count the times they trash cans have been opened.
The hardware guts seem relatively simple, but I’d like to be able to debug the voltages, timings, etc on some of the circuits to know how the thing operates before I try to make too many assumptions. What equipment would I need? I have a cheap multimeter, but it’s really slow, so it’s no good for timing, and I can’t be sure the voltage it reads is the max voltage applied to the motor or servo. Would I need an oscilloscope? A logic analyzer? How cheap can I reliably get away with? Are there any USB/software ones?