Step #1: Next
- Decide to Tackle this project.
- If you want to make music, then this project is for you; move on to step 2.
Step #2: Next
- Solder Wires onto the potentiometer. I used red for the audio voltage in on the left and green for the voltage out in the center.
- I initially soldered on a black wire on the third pin, but removed it as it was redundant.
- Hot glue the Dowel onto the servo, centered, and then super glue the sandpaper to the dowel to provide a traction for the rubber band.
- Find a rubber band, preferably wide, that can be used to transfer the servo motion to the potentiometer.
- Hot glue the potentiometer in place. Don't be sparing with the hot glue, as it is not terribly strong.
- Turn both the potentiometer and servo all the way to the left and link them together with the rubber band. I had to use several as the servo shifted while the glue was cooling.
Step #3: Next
- Wire that Arduino.
- Supply +5V to the power rail on the breadboard, and then to each ultrasonic power pin, the servo power pin, and the photo-resistor.
- Supply GND to the GND rail on the breadboard, and then to each ultrasonic ground pin, the servo ground pin, and the piezo buzzer ground pin.
- I use analog 0 for the photo-resistor output, digital 10 for the servo, digital 2 for the ultrasonic output, and digital 8 for the ultrasonic input
- Use a 10k Ohm resistor as a pull-down for the photo-resistor, by connecting it to GND and analog 0, or whatever analog pin you end up connecting the photo-resistor to.
- Now it is time to code the Arduino.
- See attached file, theremin.pdf for the code.
- The volume should increase as your hand is moved closer to the Ultrasonic, so if else happens, simply reverse the mapping of the servo position.
- Change the code from rad = map(dist, 8, 20, 0, 90); to rad = map(dist, 8, 20, 90, 0);