Hello everyone,
I'm creating a MIDI volume pedal (well, trying) using a Wah pedal and an Arduino. The wah pot (device indicating position of pedal) that I have is 200K, yet the analog input takes 10K. Any suggestions on what to do? Can the CPU of the Arduino be modified to take a different resistance? Or do I need to create a circuit that will go from 200K to 10K?
Thanks,
Jeff
Is the pot set up as a voltage divider? In that case, it should not matter as long as the output voltage is between 0 and 5 volts.
No, it doesn't have a voltage divider.
In that case you won't get the full control swing out of the pot. Connect the two wires from your peddle to ground and the analogue input. Then connect a 200K (or so) resistor from the same analogue input pin to +5V. As the impedance is soo high it might be a bit noise so average several readings.
You may find that the pot in the pedal does not rotate the full 270 degrees when the pedal is operated. So you may not get the full range of analog input that you expect. If you can, it will be best to re-wire the pot as a voltage divider so that the two ends of the track are connected to 5V and Ground, and the wiper is connected to Analog In 0.