ADXL345 3-Axis Digital Acceleration of Gravity Tilt Module for Arduino

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Introduction
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 two’s complement and is accessible through either an SPI (3- or 4-wire) or I2C digital interface.

ADXL345 DATASHEET
Hardware Overview
Features

Supply Voltage: 2.0 - 3.6 VDC
Ultra Low Power: As low as 23 uA in measurement mode, 0.1uA in standby mode at 2.5V
SPI or I2C Communication
Single Tap / Double Tap Detection
Activity / Inactivity Sensing
Free-Fall Detection
The ADXL345 has special sensing abilities! The single and double tap sensing detects when a single, or two simultaneous, acceleration events occur. Activity and inactivity sensing detect the presence or lack of motion. Free-fall sensing compares the acceleration on all axes with the threshold value to know if the device is falling. All thresholds levels that trigger the activity, free-fall, and single tap/double tap events are user-set levels. These functions can also be mapped to one of two interrupt output pins. An integrated, patent pending 32-level first in, first out (FIFO) buffer can be used to store data to minimize host processor intervention.

The ADXL345 is well suited to measure 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°. Furthermore, low power modes enable intelligent motion-based power management with threshold sensing and active acceleration measurement at extremely low power dissipation.

Applications
Handsets
Medical Instrumentation
Gaming and Pointing Devices
Industrial Instrumentation
Personal Navigation Devices
Hard Disk Drive (HDD) protection
GND This pin must be connected to ground
VCC Supply Voltage
CS Chip Select
INT1 Interrupt 1 Output
INT2 Interrupt 2 Output
SDO Serial Data Output (SPI 4-Wire) / I2C Address Select
SDA / SDI / SDIO Serial Data I2C / Serial Data Input (SPI 4-WIRE) / Serial Data Input and Output (SPI 3-Wire)
SCL/SCLK Serial Communications Clock