adxl345-python

Raspberry Pi Python i2c library for the ADXL3453-axis MEMS accelerometer IC which is used in breakout boards like the Adafruit ADXL345 Triple-Axis Accelerometer (http://shop.pimoroni.com/products/adafruit-triple-axis-accelerometer).

This library is a basic implementation of the i2c protocol for the IC offering a simple way to get started with it on the Raspberry Pi.

You can import the module and get a sensor reading like this:

from adxl345 import ADXL345

adxl345 = ADXL345()

axes = adxl345.getAxes(True)
print "ADXL345 on address 0x%x:" % (adxl345.address)
print "   x = %.3fG" % ( axes['x'] )
print "   y = %.3fG" % ( axes['y'] )
print "   z = %.3fG" % ( axes['z'] )

or you can run it directly from the command line like this:

sudo python ADXL345.py

which will output the current x, y, and z axis readings in Gs.

If you wish to exercise the ADXL345's interrupt functionality to alert the Pi when it detects motion, connect a wire between the 'INT1' pin on the ADXL345 and the GPIO-7 pin on the Raspberry Pi. Then, refer to example-interrupt.py:

from adxl345 import ADXL345
from time import sleep

adxl345 = ADXL345(interrupt = True)

try:
  while True:
    sleep(10)
except KeyboardInterrupt:
  adxl345.cleanup()