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Memsic 2125 Accelerometer
The Memsic 2125 (datasheet) is a two-axis accelerometer capable of measuring acceleration up to plus or minus 2g. It has a simple digital interface: two pins (one for each axis) emit pulses whose duration corresponds to the acceleration of that axis.
Circuit
Schematic:
click the image to enlarge
The 5V pin and GND pins on the Arduino are connected to the 5V and GND pins of the Memsic 2125; digital pin 2 of the Arduino is connected to the X out pin of the Memsic, and digital pin 3 is connected to the Y out pin.
Code