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Unread 12-02-2015, 21:48
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Re: 5K ohm 10 turn Potentiometer trouble

Just to verify - do you have the red and black wires connected to the ends of the resistor, and the white to the "sweep"? (I'm assuming the usual 3-wire arrangement, black=0V, red=5V, white=signal.)

You can check this by unplugging the pot from the 'RIO and measuring the resistance between red and black with a meter - it should stay constant at about 5K no matter what position the knob is in.

Then, measure the resistance between white and either of the others - it should sweep from 0 ohms at one end to 5K at the other.

5K should work just fine. We're using a 10K 10-turn pot from Jameco, and 5V should work oh-so-slightly better for measurement purposes, at the trivial cost of drawing a full mA of current as opposed to a half mA.
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