The QTR-1A reflectance sensor carries a single infrared LED and phototransistor pair in an inexpensive, tiny 0.5" x 0.3" module that can be mounted almost anywhere and is great for edge detection and line following applications. This sensor is sold in packs of two units.
The YDM musical robot has been featured all over the place, including Make Magazine 27. Along with the members of Let's Make Robots, we felt that a bundle of the electronic components you'd need to build it was in order.
This easy to use and low cost module is capable of sending and receiving serial data wirelessly between microcontrollers or to a PC. The low power consumption makes this module ideal for use in battery powered applications.
This is a small board for prototyping through hole components with the LilyPad system. This allows for quick and easy prototyping - all you have to do is cut the traces between holes you don't want connected!