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PostPosted: Mar 3rd, 2017, 1:48 pm 
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Joined: Jan 31st, 2015, 4:12 pm
Posts: 16
I've been playing with thermistors, and after much trial and I error found that simply digital toggling a pin with the right size resistor connected to ground gives you enough noise to make oversampling work well with 3.3v promini style boards:

https://edwardmallon.wordpress.com/2017/02/27/enhancing-arduinos-adc-resolution-by-dithering-oversampling/

The overhead for adding 2-4 bits of extra ADC resolution is pretty small, but the 4n power relationship balloons up quickly after that. Personally I think the sweet spot is oversampling for 4 extra bits with 256 readings. Anyway, this should work with any resistance based sensor, provided there are no capacitors nearby to squelch out your noise signal.


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