Datasheet

Overview

The ADXL345 is a low-power, 3-axis MEMS accelerometer modules with both I2C and SPI

interfaces. The Adafruit Breakout boards for these modules feature on-board 3.3v voltage

regulation and level shifting which makes them simple to interface with 5v microcontrollers

such as the Arduino.

The ADXL345 features 4 sensitivity ranges from +/- 2G to +/- 16G. And it supports output

data rates ranging from 10Hz to 3200Hz.

ADXL345 datasheet (http://adafru.it/c5e)

How it Works:

(http://adafru.it/c5f)MEMS - Micro Electro-Mechanical Systems

The sensor consists of a micro-machined structure on a silicon wafer. The structure is

suspended by polysilicon springs which allow it to deflect smoothly in any direction when

subject to acceleration in the X, Y and/or Z axis. Deflection causes a change in capacitance

between fixed plates and plates attached to the suspended structure. This change in

capacitance on each axis is converted to an output voltage proportional to the acceleration

on that axis.