Arduino RGB colour mixer: three knobs, one RGB LED
Open in the lab ▸Make my own copy
Three potentiometers mix red, green and blue on one RGB LED, each colour through its own 220 Ω resistor. analogRead gives 0 to 1023; divided by 4 that is the 0 to 255 analogWrite wants. Red and blue make purple, red and green make yellow, all three make white. Open it and press Run: the sketch is inside the board (click the board, then Code). Every part, pin and resistor matches what you would build on a real breadboard; the guided build of the same name has the test sheet and hidden faults.
What is on the bench
9 parts, 17 wires, with a sketch (the program runs in the lab). Boards: Arduino Uno R3.
| Potentiometer | 3 |
|---|---|
| Resistor | 3 |
| Arduino Uno R3 | 1 |
| USB charger / port | 1 |
| RGB LED | 1 |
Put it on your page
The project runs live inside the frame: readers can press buttons, turn knobs and read the meters.
<iframe src="https://zencircuitlab.com/embed/zclcrgb" width="100%" height="560" style="border:1px solid #2f363a;border-radius:10px" loading="lazy" title="Arduino RGB colour mixer: three knobs, one RGB LED on Zen Circuit Lab"></iframe>
Link
https://zencircuitlab.com/p/zclcrgb
Published by its author under the lab's community terms: it may be opened, copied and changed by anyone. Simulation results are for learning; check a real build against the parts' datasheets.