[SOLVED] Accelerometer Question

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fsoender

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My accelerometer is showing 1.6v at 0 degree. The voltage goes up turning it one way, and goes downwards the other way. But on 180 degee it shows 1,6v again. Is this correct? How do I know if the accelerometer is 0 degree or 180 degree when they have same output value?
 

How do I know if the accelerometer is 0 degree or 180 degree when they have same output value?
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You'll get more ambiguities by rotating the accelerometer around other axes. For an unequivocal detection of spatial orientation, you need not less than 3 orthogonal accelerometer channels.
 

Thanks, but why do the Accelerometer give the same voltage twice over a 360 degree span?
Mine give:

0 - 1.5v
90 - 2.4
180-1.5v
270- 0.8v
 

1.5 V simply means zero g, gravitation force is orthogonal to the direction of sensitivity.

Think of accelerometer output = a*sin(phi) + b
 

OK, I get that. But why is there 0g at 0 and 180 degree?
 

Because at zero and 180 to horizontal, your Z acceleration
is orthogonal to the active axis of measurement and has (by
design) null output.
 
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