Sparkfun Electronics LilyPad Accelerometer ADXL335

The LilyPad Accelerometer ADXL335 is a three axis accelerometer for the LilyPad system. Based on the ADXL335 accelerometer from analog devices, it can detect joint movement as well as inclination and vibration. It outputs a 0V to 3V analog signal on each of the X, Y, and Z axis. You will need to convert this analog voltage to a gravity amount and use trigonometry to calculate a true angle. It is very easy to use this sensor for basic motion sensing. Each LilyPad is designed to have large connecting pads to allow them to be sewn into clothing. Various input, output, power, and sensor boards are available.