Vassilis's Comments

Comment Wall (4 comments)

At 7:01am on October 11, 2009, Rana said…
Hi !
Where did you get Paparazi hardware ?
Which version it is ?
How much it costed it to you without shipping charges ?
How can I buy one like this ?

Regards

Rana
At 5:12pm on October 12, 2009, Rana said…
Vassilis,
How much it costed you ?
At 7:12am on November 7, 2009, William Premerlani said…
Vassilis,

The only gyros that we have tested are the ST LISY gyros and the Analog Devices ADXRS gyros. We found that the Analog Devices are immune to vibration, but the ST LISY gyros are very sensitive to vibration.

Using a higher sampling rate on the LISY gyros will help with small vibration, but if the vibration is large enough, we think that the gyro resonates and "rattles", producing a nonlinear effect that leads to a large offset. In other words, there is nothing you can do to fix the LISY gyros when there is large vibration.

We have done testing on a conventional helicopter, but not with a quadcopter. Possibly the quadcopter has less vibration than a conventional helicopter.

In any case, I would be very interested in what you learn.

Best regards,
Bill
At 12:26pm on November 7, 2009, William Premerlani said…
Vassilis,

Oh, no!! I was seriously considering using the IDG-500 on the next revision of my board, but now you tell me that they are vibration sensitive!! That's not good.

Looks like I may have to go with the Analog Devices ADXRS. They are more expensive and will have to mount vertical, but they work well, and are vibration-proof.

Guess I will have to buy some gyros and do my own testing.

Bill

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