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Gravity as a Calibration Reference
Acceleration can be measured in units of gravitational force or "G", where 1G represents the gravitational pull at the
surface of the earth. Gravity is a relatively stable force and makes a convenient and reliable calibration reference for
surface-dwelling earthlings.
Calibration Method:
To calibrate the sensor to the gravitational reference, you need to determine the sensor output for each axis when it is
precisely aligned with the axis of gravitational pull. Laboratory quality calibration uses precision positioning jigs. The
method described here is simple and gives surprisingly good results with just a block of wood.
Mount the Sensor:
FIrst mount the sensor securely to a block or a box. The size is not important, as long as all the sides are at right
angles. The material is not important as long as it is fairly rigid.
Load the Calibration Sketch:
Load and run the Calibration sketch below. Open the Serial Monitor and wait for the prompt.
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