So far I will only use analog output gyros. I've developed several small vehicles that use propellers rotating say 6000 Rpm and less. If you're running say a 50 hz autopilot you really must watch out for aliasing in your sensors. The lower the noise source frequency the bigger the problem will be. So far the economical digital inertial sensors that I've seen would not give me the noise immunity that I need in a high vibratory environment.
Just wanted to make it clear: InvenSense 3 axis is a SINGLE CHIP 3 axis gyro product,
ST is three axis single package, not SINGLE chip, product. Anyone can stick three gyros into a fat package....
Quite a small case. I like analog because it's easy to work with. Now all the arduIMU designs have a new gyro for their next revision. Its hard to keep up with these new gyro releases but I'm not complaining!
For accelerometers I have been looking at ST's AIS326 3 axis digital (+/- 2g) and so far like it better than the 7260 analog. Mainly because it comes closely calibrated from the factory and has 12 bits of digital accuracy which can easily get lost in micro a/d's. I can post plots if any one is interested.
After seeing the datasheets od ITG3200 & LYPR540AH, it is clear that both the devices are 3 axis gyroscopes.
ITG3200 is a 3-axis digital gyroscope where as LYPR540AH is 3-axis analog output gyroscope.
Angus, I have a Chinease 3-D Mechanical Gyro mounted in the X-UFO, similar to Quadrocopter.
It has 3 Hall sensors mounted in three orientations such that whereever the motor with rotating disc tilts, the change in magnetic flux is communicated by the Hall sensors.
I have seen almost zero vibration issue in this type of gyro, what u guys think about it ?
I'm pretty sure this really is the first single chip 3-axis gyroscope. What we saw (perhaps a month or two ago) was the introduction of 2-axis gyros that can be mounted FLAT side-by-side on a PCB so you get the same effect but with two chips. Up until then you always had to mount one of the gyros at 90 deg sticking out of the board.
Man, you can barely get the latest chip onto a breakout board before something better comes along!
With all the talk of vibration testing recently, I'm looking forward to the results on this one.
Comments
So far I will only use analog output gyros. I've developed several small vehicles that use propellers rotating say 6000 Rpm and less. If you're running say a 50 hz autopilot you really must watch out for aliasing in your sensors. The lower the noise source frequency the bigger the problem will be. So far the economical digital inertial sensors that I've seen would not give me the noise immunity that I need in a high vibratory environment.
(Other than to be a troll)
ST is three axis single package, not SINGLE chip, product. Anyone can stick three gyros into a fat package....
Sounds like your Chinese mechanical gyro is really a 3 axis magnetometer. What is the cost and source?
ITG3200 is a 3-axis digital gyroscope where as LYPR540AH is 3-axis analog output gyroscope.
Angus, I have a Chinease 3-D Mechanical Gyro mounted in the X-UFO, similar to Quadrocopter.
It has 3 Hall sensors mounted in three orientations such that whereever the motor with rotating disc tilts, the change in magnetic flux is communicated by the Hall sensors.
I have seen almost zero vibration issue in this type of gyro, what u guys think about it ?
Man, you can barely get the latest chip onto a breakout board before something better comes along!
With all the talk of vibration testing recently, I'm looking forward to the results on this one.
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