Playing With Accelerometers
I've found two 3-axis acceleremoters and went discovering how they work. A third one, the ADXL345 is based on I²C bus.
Actually, it's a mix of hardware and software.
The accelerometer is a standard breakout.
It is small enough to fit into the standard sensor case used by ft for blinking lights, tracer or colour reader modules.
Right, an example of casing into a tracer module.
For more details about accelerometers (and gyroscopes), please refer to these excellent tutorials: