A Dual Axis accelerometer ADXL202 will be discussed in this document.

Description

The ADXL202 is a low cost, low power 2-axis accelerometers with range of -2g to +2g.  It measures both static accleration (eg. gravity) and dynamic acceleration (eg. vibration).  Since they have digital outputs (duty cycles proportational to acceleration), they can easily be used without the need of a A/D converter.

Reference

Go to the following links for details on the device.

Link to download datasheet in .pdf format:
    http://www.analog.com/pdf/ADXL202_10_b.pdf/
Link to manufacturer:
    http://www.analog.com/

Sample application

In the current project, 4 ADXL202 chips (total of 8 accelerometers) are used to determine the limp position of a robot.  The data from the accelerometers are used for a feedback circuit for servo control.

The following are links on details on the use of this device in current project:

Diagram on ADXL202 and sampling register:
reg-dia1.jpg

VHDL code for smapling register:
acce_cr.vhd

E-mail the author if there are any questions regarding this document.