Electronics > Beginners
Something to see my signals with?
Cody Turner OKC:
Hi guys, so I have been wanting to have a oscilloscope for a very long time now and I promise that some day I will have one hopefully in the next 2 years, so I am not looking for a alternative to a oscilloscope, but I have been very interested in seeing signals from the little circuits I build up and stuff, and never really thought of a way,
Well yesterday I was at a local Goodwill store and found one of those Arduino uno things that was 4 dollars so I ran home and scooped up my saving jar and got the 4 dollars and went and bought it luckily it was still there!
So now I am wondering if maybe I could use it some way to be able to view my signals graphically kind of like a oscilloscope, I don't really care about the frequency I just want any way at all to see just for fun to exoirement and learn and I am really excited feeling I might finally have a chance to, hopefully at least!
I thought maybe someone could give me advice, not on how to build it because I can research it maybe, but if 1, it's even possible, and two is there any like circuit I could build for the input to maybe help or make it possible, if not it's okay but I would like to know, thank you guys so much!!
darrellg:
https://www.instructables.com/id/Ultimate-Guide-to-Adruino-Serial-Plotter/
rstofer:
The Arduino has multiple ADC inputs so, yes, it is 'possible'. The limiting factor will be the sample rate. I don't know for sure how fast the Arduino can sample 1 or more inputs but apparently, that maximum is around 10 kHz. Therefore, the maximum signal you can properly sample is around 5 kHz (Nyquist/Shannon Sampling Theorem). What you probably can't do is display while sampling. You would need to take a bunch of samples (the Arduino Uno can only take 2k 8-bit samples and that's making some assumptions about memory use). Maybe you can take 1024 samples in about 0.1 seconds and then figure out how to display them. If you use the Mega 2569, you have much more memory.
There are a LOT of resources via Google - you can just buy the shield:
https://www.instructables.com/id/Make-an-Oscilloscope-Using-the-SainSmart-Mega2560-/
rstofer:
If it's digital you want to see, a cheap logic analyzer will work better.
https://www.saleae.com/
Cody Turner OKC:
Okay cool I see, great! It is analog signals and I think 5khz would be plenty like I said I just want to see for fun because it would be kind of like owning a oscilloscope in a way! I will look through those links , I don't know anything about the Arduino yet so I will have a lot of research to do I suppose and dang that "shield" would be awesome! I unfortunately can't order stuff online or buy stuff except what I can find in local stores within walking distance, but thank you guys so much it gives me something to work off of!
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