This is the comprehensive guide to ZigBee wireless networks. This kit includes many of the parts and pieces you will need to work through the examples in the book. If you're serious about learning everything you need to know about XBee networks, this kit and the book will get you up to speed in no time (or as long as it takes you to get through the book).
This is an LED-based “candle” that cycles through all the colors of the rainbow. The LectroCandle is a simple, through-hole kit, comprised mainly of 3 RGB LEDs and an ATtiny85 to control them.
This is a PCB made for the MQ-3, MQ-4, MQ-6 and MQ-7 gas sensors.