I will not go into greater detail of the code behind the rotary encoder + arduino experiment, as featured articles and great tutorials are available all over the web. Lab Note: RT & Arduino experiment ...

This is an easy tutorial showing how you can control the brightness of an LED or adjust the speed of a DC fan using Arduino Board, a small BC547 transistor and a potentiometer.

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For beginners learning to program Arduinos, a web-based, fully networked developer environment called Codebender could drastically reduce the learning curve.

Created by the parts supplier and Arduino tutorial creator Adafruit, the camera is built using an Arduino, an Eye-Fi Wi-Fi SD card, a TTL Serial JPEG camera, and a few other parts.