The analog accuracy and sensitivity of the standard Uno / Nano pins is about 5mv per 'step' that we can read from executing an AnalogRead. Fine for many purposes but not so great if you're trying to ...
A tube is fixed in the fountain with its end below the lowest expected water level. A pump blows air into the tube until it bubbles out of the lower end. Then, the air pressure in the tube will be ...
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