# Accelerometer Circuit

Posted on Feb 6, 2014

As you are probably familiar, an accelerometer is a device that can measure dynamic acceleration (vibrations) and static acceleration (gravity). Being that it measures this, it can measure tilts, rotations, and movements/lack-of-movements for alarm system sensing. Basically, it can measure if it`s being tilted, rotated, or moved around. Being that

an accelerometer measures tilts, it needs a microcontroller to be able to read these tilts and record how much it is tilted. The microcontroller we will connect to the accelerometer is an arduino microcontroller. Tilts and imbalances on accelerometers are measured in unit millig`s. A millig (mg) is a 1/1000th of a g. Being that the g-force is equal to 9. 81m/s2, a millig is equal to 1/1000th of this value. The memsic 2125 is a dual- or two-axis accelerometer. It can measure tilts in the 2 directions, the X-direction and the Y-direction. This means that if we shift it left and right, this is the X-direction. If we shift it forward or backward, this is teh Y-direction. The memsic is able to record these movements and then the arduino can sense and output to us the data. To connect the accelerometer, we give it +5VDC of power. Accelerometers need power in order to operate. We connect both GND pins to GND. These are Pins 3 and 4. Then we connect Pin 2, Y OUT, to D3 of the arduino. We connect Pin 5, X OUT, to D2 of the arduino. Terminals D3 and D2 of the arduino are digital input pins, which receive the digital readings that the accelerometer gives out, showing its X and Y axis tilt readings. Now that we have connected the circuit, we now need to create a program which calculates the millig readings and can display to us on the computer so that we can know all the readings that go on as the accelerometer is tilted. Once we put...

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