ADXL345 Triple Axis Accelerometer Breakout SparkFun

The ADXL345 is a small, thin, low power, 3-axis MEMS accelerometer with high resolution (13-bit) measurement at up to +-16 g. Digital output data is formatted as 16-bit twos complement and is accessible through either a SPI (3- or 4-wire) or I2C digital interface.
The ADXL345 is well suited to measures the static acceleration of gravity in tilt-sensing applications, as well as dynamic acceleration resulting from motion or shock. Its high resolution (4 mg/LSB) enables measurement of inclination changes less than 1.0 degrees.
Key Features

2.0-3.6VDC Supply Voltage

Ultra Low Power: 40uA in measurement mode, 0.1uA in standby@ 2.5V

Tap/Double Tap Detection

Free-Fall Detection

SPI and I2C interfaces

Resources

Schematic

Eagle Files

Hookup Guide

Datasheet

Example Code(ATmega328)

GitHub