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???
07/24/09 01:36
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  07/24/09 01:36
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 		 #167783 - There's no need to use two of them...
Responding to: ???'s previous message
Datasheet of ADXL202 says:

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0 to 90°  -> Uout = 2.5...2.812V
0 to -90° -> Uout = 2.5...2.188V

where the angle is measured against the horizontal plane (in parallel to the earth's surface). Remember, exceeding this +-90° range will make your quad rotor crash any way!

No, the quad rotor's x/y-plane is changing only very slightly. The authors say that they have averaged over two to increase the sensitivity. This makes sense to some degree, because summing over two ADXL202 will double the signal. And as the noise will only rise by factor of SQRT(2) this even results in an improvement of signal to noise ratio by 3dB, which isn't so much, of course.

Kai

List of 24 messages in thread
TopicAuthorDate
Accelerometers as angle sensor, analog circuitry            01/01/70 00:00      
   Integrators ?            01/01/70 00:00      
      Seems to work with subtraction            01/01/70 00:00      
         There's no need to use two of them...            01/01/70 00:00      
   A bunch of baloney??            01/01/70 00:00      
      Shame it won't work.            01/01/70 00:00      
         You can compensate for centrifugal accelerations, but not...            01/01/70 00:00      
            How to use Accelerometers as angle sensors            01/01/70 00:00      
               Bloody hell, are you trying to solve this relativistically?            01/01/70 00:00      
                  The problem            01/01/70 00:00      
                     Could this be correct?            01/01/70 00:00      
                        Yes, if...            01/01/70 00:00      
                  Understood but the theird method...            01/01/70 00:00      
                     Upward and downward...            01/01/70 00:00      
                        Am I thinking in 2 Dimensions and you in 3D ?            01/01/70 00:00      
                           Centrifugal acceleration            01/01/70 00:00      
               What I wanted to tell...            01/01/70 00:00      
      Filter you guess then ?            01/01/70 00:00      
         It is a differential amplifier...            01/01/70 00:00      
            Schematics            01/01/70 00:00      
               Yes, but still looking funny...            01/01/70 00:00      
   Gyroscope            01/01/70 00:00      
      Gyro            01/01/70 00:00      
      Gyro ?            01/01/70 00:00      

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