3D Robotics Comment by Jordi Muñoz on April 1, 2010 at 8:46pm

Cool!

Moderator Comment by Chris Anderson on April 1, 2010 at 8:48pm

$15 each in quantities of 1

3D Robotics Comment by Jordi Muñoz on April 1, 2010 at 8:50pm

that's pretty cheap...

3D Robotics Comment by Jordi Muñoz on April 1, 2010 at 9:50pm

I just got an eval board.

Comment by Faisal Shah on April 1, 2010 at 11:16pm

Jordi: Strap it onto a plank of wood with a motor and dump the data here please :)

Comment by Xander on April 1, 2010 at 11:35pm

Excellent! Now they've just got to combine this with the 3 axis accel into a single chip and we might finally have an ideal, low cost IMU.

Comment by Melih Karakelle on April 2, 2010 at 12:02am

Another "game controller" type mems device. I'm not thinking it is usefull for IMU. You dont have any control on sampling rates and output values. You can read the values in 100.000hz with any PIC or Atmel controller's ADC with 10 bit resolution. But this device giving 14.000 output only in 8 bit mode. And digital filtering is another problem. You can make perfect filter with a resistor and a capacitor for analog aoutputted sensor. But when using digital sensors, you need calculations + extra ram + extra cpu usage for making a filter and results will already noisy.

Moderator Comment by Krzysztof Bosak on April 2, 2010 at 4:04am

Melih is theoretically on track.
Analog filtering for IMUs is a delicate thing and I believe should be done tailored to our environment, which is full of vibration and oscillations that we cannot control, so we shouldn't try to track them.
The key value is the amount of temperature drift.
Everything else is nearly perfect.

Comment by David Ankers on April 2, 2010 at 6:00am

There are several gyros we tested that should be near perfect according to the data sheet alas in real world testing it does not always work out that way. Lets hope it does, good news is that one member of OpenPilot team has already got an eval unit on the way and is waiting on the 3 axis accel and mag from ST for a new AHRS,

However this is planned to be an FPV head tracker and I'll quote him "For headtracker this will work quite fine and is perfect solution I would hope but for aircraft I am not so sure.". Seems to back up Melih's thoughts and actual but testing will tell.

Because Open Pilot is sold as close to cost as we can get it, we have room to use high-end parts and have always wanted a high end autopilot and AHRS, we also really wanted a flat AHRS and worked really hard to try and achieve this: http://www.openpilot.org/OpenPilot_FAQ#Why_not_a_flat_AHRS.3F

All this OMG and ten thousand exclamation points everywhere doesn't add much credibility to this thread.

Moderator Comment by Brian on April 2, 2010 at 6:19am

If it works well for fpv, then I'll bet these would work well for stabalizing the camera on a slow moving underwater vessel (or surface vehicle for that matter). Think I'll get one for my swimmer!

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