Racking my brain, why am I seeing these tiny voltage fluctuations?

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MikeA

Joined Jan 20, 2013
253
So I hung a long wire off one of the unconnected A/D inputs, it's just as flat as before.

But the A/D input connected to the pressure sensor now has the unexplained rise/drop at a different time. It shifted with DST going away.

I guess isolated power supply is the last step now. Or an RF box around the pressure sensor. :)
 
Last edited:

djsfantasi

Joined Apr 11, 2010
7,626
I am not surprised that you’re seeing those minor fluctuations. In whatever is reading the ADC, I implement a smoothing algorithm. So far, I use a rolling average of several readings. The length of your FIFO buffer depends on the responsiveness required by your application.
 
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