Build Your Own Batteries!
Arduino Motor Shield Tutorial
Intro to Arduino
Simple IR proximity sensor with Arduino
DIY Arduino Motor Shield (L298N 2x4A)
Tempduino - Arduino Based Temp and Humidity Display
Arduino Cellular Shield Tutorial
DIY Miniature Thermometer
Athena: The Global Car Tracking System(3D Images)
1HP Electric Car
easy glass bottle cutter made up of common parts [UPDATED... again]
DIY Human Powered Wooden Hydrofoil - The "Hydrothopter"