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Detecting more breaths and killing noise
I had two problems: too much noise, likely due to a high impedance, and not enough amplitude in some sleep positions.
When sleeping on my tummy, not enough of the belt moves, and it may be stuck under my body.
A longer belt seemed like a way to detect movement all around my chest.
But to compensate for increased resistance (mine was already too high), I put a triple layer of fabric. This brought resistance down to 10kOhm, this sounded perfect!
Results were disappointing, the noise didn't go away, and the amplitude measured went down since the amount of stretch per fabric length was lower.
So, back to a smaller single piece of fabric.