This design is based on the Rotary Encoder LED Ring Breakout Board by Mayhew Labs. I used 1 × red, 1 × green, and 1 × blue to make this RGB Controller. You also need 3× Rotary Encoders - I used these from SparkFun which are inexpensive and work. I cannot really recommend them though - they feel kind of cheap when you rotate them and they have only 12 steps for a 360° rotation, which is not enough! I also do not like the potentiometer knobs from SparkFun - I need to find better knobs.
Parts List
| Count | Part | Cost |
|---|---|---|
| 1 | Rotary Encoder LED Ring Breakout Board - Red | $16 |
| 1 | Rotary Encoder LED Ring Breakout Board - Green | $16 |
| 1 | Rotary Encoder LED Ring Breakout Board - Blue | $16 |
| 3 | Rotary Encoders | $9 |
| 3 | Potentiometer Knob | $3 |
| 1 | USB Boarduino v2.0 | $25 |
Wiring
| Breakout Board Pin |  |
 |
 |
|---|---|---|---|
| GND | GND | GND | GND |
| VCC | 5V | 5V | 5V |
| ENCA | DIGITAL 2 | DIGITAL 4 | DIGITAL 6 |
| ENCB | DIGITAL 3 | DIGITAL 5 | DIGITAL 7 |
| SWITCH | DIGITAL 8 | DIGITAL 9 | DIGITAL 12 |
| SDI | Green SDO | Blue SDO | DIGITAL 11 (MOSI) |
| CLK | DIGITAL 13 (SCK) | DIGITAL 13 (SCK) | DIGITAL 13 (SCK) |
| LE | DIGITAL 10 (SS) | DIGITAL 10 (SS) | DIGITAL 10 (SS) |
| OE | GND | GND | GND |
| SDO | Red SDI | Green SDI |
Programming
The code is based on the example code on the ledRings Arduino library on google code.