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RELATED GUIDES

Circuit Playground: D is for Diode
Learn about the electronic one-way valve!
by C. Cunningham
Join Adabot & Woz as they explore how a diode controls the flow of electrons and how it's used in a circuit.
LSM303 Accelerometer + Compass Breakout
Triple Axis Accelerometer and Magnetometer (Compass) breakout board.
by Bill Earl
Learn how to use the LSM303 breakout module with your Arduino to build a basic navigation system.
2.2" TFT Display
220x176 pixels in 18 bit color with a microSD breakout
by lady ada
This lovely little display breakout is the best way to add a small, colorful and bright display to any project. Since the display uses 3-wire SPI to communicate and has its own pixel-addressable frame buffer, it can be used with every kind of microcontroller. Even a very small one with low memory and few pins available!
Photocells
CdS Cells, Photoresistors, & Light Dependent Resistors (LDR)
by lady ada
Photocells are sensors that allow you to detect light. They are small, inexpensive, low-power, easy to use and don't wear out. For that reason they often appear in toys, gadgets and appliances. This guide will show you how they work, how to wire them, and give you some project ideas.