Use a 3D printed encoder wheel, LED, and 2 photocells to demonstrate how a quadrature encoder works.
Project tutorial by Shawn hymel
Make life an adventure with new places and companions!
Project in progress by Team Transplants
Unlimited MIDI channels, XY plotter, faders, buttons, and settings. Also visual support with OLED display!
Project in progress by yilmazyurdakul
There are a lot of Arduino-based metal detectors using various technologies. This is one of them that uses direct frequency measurement.
Project tutorial by Andrius Purr
Turn an LED on and off using Windows Remote Arduino.
Project tutorial by Team Windows IoT
Well done hacking both a rotary phone and a cheap cell phone together. I dig it! :)
SparkFun used to make and sell the "Port-o-Rotary" several years ago, which was a Bluetooth-enabled rotary phone that acted as an interface for your cell phone: https://www.sparkfun.com/products/retired/9804
The 10k resistors are only needed to create a voltage divider with the photocells. I don't know that particular encoder, but I don't think you need the resistors. You should be able to connect them to any pin (configured as input with pullup resistor) on the Arduino. SparkFun sells a similar encoder here (https://www.sparkfun.com/products/10932), and there is some example code in the comments section that should get you started.
The name of this project was well done :)
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