I'm slowly getting through a laser spirograph project that's controlled by an Arduino (save/load patterns etc
) and I have 4 100ohm pots that I'd like to use for controlling the speeds of the motors. Now, I bought these because originally I planned for this circuit to be completely analogue - they're wire wound and can take up to 2W, which is perfect for driving motors, but now I'm using the Arduino I'd love to adapt them for it.
A single one works fine with the standard setup for a pot, but of course because this is only a 100ohm pot it constantly draws 50mA from the Arduino (on the 5V output). This isn't desirable at all, especially since I need 4. I've tried several combinations of resistors with the analogue reference pin and the pot itself, but so far haven't got anywhere useful.
Is there an easy way to make these draw less current? I'd love to not have to buy 4 more, however cheap they are. I'm quite poor at the moment
I've tried making the overall voltage drop less and changing the analogue reference, but I've been having issues with it.
Thanks in advance!