Little clicky switches are standard input "buttons" on electronic projects. These work best in a PCB but can be used on a solderless breadboard as shown in this tutorial. The pins are normally open (disconnected) and when the button is pressed they are momentarily closed. They come in a pack of 20, they're pretty handy so you'll want to keep them around. You can find an EAGLE cad package for these in switch-omron:B3F-10XX
- Downloads: Example 6mm tactile switch datasheet for dimension information
- Tutorials: Tactile button tutorial
- Product Dimensions: 6.0mm x 6.0mm x 5.0mm / 0.2" x 0.2" x 0.2"
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Tactile Button Switch (6mm) - Pack of 20 
- Brand: Adafruit
- Product Code: ADA-367
- Availability: 5
- Ex Tax: £3.95