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Old 07-19-2012, 02:28 PM   #23 (permalink)
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Scopes and Arduino external power

Originally Posted by Daox View Post
I have yet to hook the arduino up to a more noise proof power source. I was going to do this but I am depending on the arduino's serial output to get feedback on the variables. I'm not sure how to connect the arduino to the computer without using the USB to power it. This is where a scope would come in quite handy.
I sometimes find it difficult to get a scope to trigger on a small change in the measured signal. You are not expecting a periodic signal that can be triggered 10 or 100 times a second to give you a nice stable display, so how are you going to 'capture' the 15 mV change?

I thought that an externally-powered USB hub would still allow you to plug your computer and the Arduino both in - but my computer tells me that the com port is not found. I guess you already knew that!
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