These are very thin variable potentiometers. By pressing down on various parts of the strip, the resistance linearly changes from 100Ohms to 10,000Ohms allowing the user to very accurately calculate the relative position on the strip.

Ribbon cable is really helpful in situations where you need to make a lot of connections without a big mess of wires.

You’ve always wanted to output analog voltages from a microcontroller, the MCP4725 is the DAC that will let you do it!

This is the SparkFun RJ45 MagJack Breakout, a simple board that will provide you with a way to put an ethernet port into your breadboard.

This is a perfect choice if you are in need of a heavy duty push button! These metal push buttons are a very tough, small, panel-mount latching switch with an illuminated green LED ring. It is a SPDT with 16mm threading and 1mm pitch. This button is perfect for basic On/Off functions. Overall length (including leads) is 1.5" and has small solder lugs for connection. These latched buttons are rated up to 3A and 250VAC while the LED is rated for 5-12V.

This is a perfect choice if you are in need of a heavy duty push button! These metal push buttons are a very tough, small, panel-mount latching switch with an illuminated yellow LED ring. It is a SPDT with 16mm threading and 1mm pitch. This button is perfect for basic On/Off functions. Overall length (including leads) is 1.5" and has small solder lugs for connection. These latched buttons are rated up to 3A and 250VAC while the LED is rated for 5-12V.

These tactile buttons are great for all sorts of projects. This assortment comes with 2 of each of 6 different colors for a total of 12 buttons. The colored caps are removable and the buttons fit into breadboards. See the drawing below for exact dimensions.