GY-291 ADXL345 digital three-axis acceleration of gravity tilt module IIC / SPI

The ADXL345 is a small, thin, ultralow power, 3-axis accelerometer with high resolution (13-bit) measurement at up to ±16 g. Digital output data is formatted as 16-bit twos complement and is acces-sible through either a SPI (3- or 4-wire) or I2C digital interface. 

The ADXL345 is well suited for mobile device applications. It measures the static acceleration of gravity in tilt-sensing appli-cations, as well as dynamic acceleration resulting from motion or shock. Its high resolution (3.9 mg/LSB) enables measurement of inclination changes less than 1.0°. 

Several special sensing functions are provided. Activity and inactivity sensing detect the presence or lack of motion by comparing the acceleration on any axis with user-set thresholds. Tap sensing detects single and double taps in any direction. Free-fall sensing detects if the device is falling. These functions can be mapped individually to either of two interrupt output pins. An integrated, patent pending memory management system with a 32-level first in, first out (FIFO) buffer can be used to store data to minimize host processor activity and lower overall system power consumption. 

Low power modes enable intelligent motion-based power management with threshold sensing and active acceleration measurement at extremely low power dissipation. 

Features :

• Main Chipset: ADXL345
• Communication: IIC/SPI Communication Protocol
• Measuring Ranging: ±2g±16g
• Digital Output: SPI/IIC
• 3-axis, ±2g/±4g/±8g/±16g
• Compact Accelemotor/Inclinometer
• Working Voltage: 3V to 5V
• Working Temperature: -40° to 85°
• Working Current: 30uA
• Low Power Consumption
• Compatible with 51、AVR、Arduino

http://arduinolearning.com/code/arduino-adxl345-gy-291-example.php

https://github.com/jenschr/Arduino-librarie

http://forum.arduino.cc/index.php/topic,132879.0.html

 Code

This needs the Adafruit library – https://github.com/adafruit/Adafruit_ADXL345

วงจร 

Again a module is easiest to use, here is atypical one that I used

Connection

I used the following connection from the module above to my Arduino