Arduino interface to Accelerometer

With the advent of 20^th century and internet, the concept of open-source came into force. It is a practice in production and development that promotes access to source data of an end-product. Arduino is a descendant from the same open source culture. Arduino is an open-source single-board microcontroller. This project is about interfacing Memsic2125 accelerometer to arduino. The Memsic 2125 is a low cost, dual-axis thermal accelerometer capable of measuring tilt, acceleration, rotation, and vibration with a range of ±3 g. These Micro-electro-mechanical systems (MEMS) IC based accelerometers have an advantage over the conventional laboratory accelerometers that they are capable of measuring the acceleration due to gravity (represented by dynamic acceleration).

The output of Memsic2125 is a pulse width modulated waveform which indicates the acceleration. The arduino is powered through a USB port.

On a flat surface, as the law says the acceleration due to gravity is zero which shows a 100Hz, 5V square wave on the oscilloscope. Otherwise, some swing is observed in the output wave which indicates some finite value of acceleration.

This way you can interface a Memsic2125 to an arduino to measure acceleration. Turn the device at various angles to record more values on the oscilloscope and get a better idea about the project.