I read this today and I totally relate to it. Any time I try and build something and run in to problems I do a search on the internet... Actually, I should rephrase that: Any time I try and build something I run in to problems and do a search on the internet...https://www.raspberrypi.org/forums/viewtopic.php?f=29&t=214661&start=25#p1323241 wrote: Unfortunately, I do not have a scope, nor does anybody I know.
The only tool I do have, is a digital multimeter my uncle gave me.
When I do this I find very helpful information, normally backed up by someone showing a 'scope trace showing what's going on.
Like the OP, I just have a cheap multimeter that just about tells me a rough indication of average voltage, continuity and resistance.
I have a hankering to see what's going on but a very tight wallet and don't know what I can cheaply buy that's actually worth having as an occasional tinkering hobbiest.
I'd like to be able see:
1) brownouts or spikes happening - handling supply for 3.3v and 5v up to a little over 12v (for 12v LED Strips controlled from pi)
2) wave forms that may not be as stable as intended or doing what I think - possibly audio, but definitely 3.3v and 5v PWM both sides of logic level converters
3) logic capture - again 3.3v and 5v to debug communication - serial and i2c perhaps?
I see things starting from a DSO138 for £11 all the way up to half an arm and one leg things that wouldn't be out of place in a research physics lab but don't know where to start in choosing something at the bottom end that can do these things well enough to be worth having.
Any advice would be gratefully accepted