Most RTs also has built in ‘push-on’ momentary switch, usually one side has 3 ... Now that your rotary encoder hardware is up and running it’s time to tell your Arduino what to do with the encoder ...

Resultant audiogram from the device showing each ear in a different color By using an Arduino to produce tones ... and a rotary encoder with push-button serves as the user input.

I needed a rotary encoder — I pulled a cheap one out of one of those “49 boards for Arduino” kits you see ... at a different technology like an optical encoder. I mention this because ...