Arduino - Rotary Encoder LED
In this tutorial, We are going to learn how to program Arduino to control the brightness of a LED according to the rotary encoder's output value.
Hardware Required
Or you can buy the following kits:
1 | × | DIYables STEM V3 Starter Kit (Arduino included) | |
1 | × | DIYables Sensor Kit (30 sensors/displays) | |
1 | × | DIYables Sensor Kit (18 sensors/displays) |
Additionally, some links direct to products from our own brand, DIYables .
Buy Note: To simplify the wiring process, we recommend using the LED Module, which comes with a built-in resistor.
About LED and Rotary Encoder
If you do not know about LED and rotary encoder (pinout, how it works, how to program ...), learn about them in the following tutorials:
Wiring Diagram

This image is created using Fritzing. Click to enlarge image
Arduino Code
Quick Steps
- Connect Arduino to PC via USB cable
- Open Arduino IDE, select the right board and port
- Copy the above code and open with Arduino IDE
- Click Upload button on Arduino IDE to upload code to Arduino
- Open Serial Monitor
- Rotate the rotary encoder
- See the LED's brightness
- See the result on Serial Monitor
Code Explanation
Read the line-by-line explanation in comment lines of source code!
Video Tutorial
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