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imapbox
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 Posted: Mon Aug 23, 2004 2:42 pm Post subject: |
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too big. I saw accelrometers that are little over a few millimeters in length though. in any event, I don't believe there are gyro's in it at all. I think it's only accelerometers. |
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imapbox
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| Posted: Mon Aug 23, 2004 2:45 pm Post subject: |
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| lbendlin wrote: | | delboy0754 wrote: |
They are sensative. To prove this, you only need to walk with the TT Go. I have a walking disability, but it still registers me at the blistering speed of 1mph |
Are you sure that's not the GPS receiver registering the speed? Remember, this thread is about the ASN. |
does it register speed or is it calculated from the changes of present position ? at my work, they only use the lat/long of GPS and calculate whatever needed to keep the aircraft flying. |
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lbendlin
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| Posted: Mon Aug 23, 2004 2:45 pm Post subject: |
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this may be nitpicking, but gyros are always accelerometers. And the piezo gyros are very small - substantially less than an inch for the innards. And even though they are called Gyro they do not have any moving parts.
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lbendlin
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| Posted: Mon Aug 23, 2004 2:49 pm Post subject: |
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| imapbox wrote: |
does it register speed or is it calculated from the changes of present position ? at my work, they only use the lat/long of GPS and calculate whatever needed to keep the aircraft flying. |
You can do it either way (but then you would need the VTG or RMC sequence from the receiver) Not sure how it is implemented in the GO, but I suspect they do it from the position difference.
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imapbox
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| Posted: Tue Aug 24, 2004 10:39 am Post subject: |
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| lbendlin wrote: | | this may be nitpicking, but gyros are always accelerometers. And the piezo gyros are very small - substantially less than an inch for the innards. And even though they are called Gyro they do not have any moving parts. |
a gyro itself doesn't have an accelerometer. if you want to do something useful with sensing directions, you do need accelerometers.
in fact, standby gyros on aircraft do not have any accelerometers installed. they only need a stable platform. that's it.
keep on nitpicking though  |
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Kaymo1
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| Posted: Tue Aug 24, 2004 11:18 am Post subject: |
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http://www.hobbico.com/accys/hcam4000.html
Just out of interest that gyro shown in the link to Hobbico is a really old unit. I fly RC helicopters where we use a gyro to help stabilize the tail and the modern units are a lot more sophisticated, and more expensive :D |
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imapbox
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| Posted: Tue Aug 24, 2004 1:45 pm Post subject: |
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| Kaymo1 wrote: | http://www.hobbico.com/accys/hcam4000.html
Just out of interest that gyro shown in the link to Hobbico is a really old unit. I fly RC helicopters where we use a gyro to help stabilize the tail and the modern units are a lot more sophisticated, and more expensive :D |
and this model doesn't have accelerometers as it's not intended for navigation.
I saw very small accelerometers btw, a few millimeters long; probably pretty cheap to include in a nav-unit. hmm, when am I going to do the step of disassembly of the unit.... |
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lbendlin
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| Posted: Tue Aug 24, 2004 1:57 pm Post subject: |
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ahh, finally I got you on the right track. why don't we just go ahead and invent a 3D accelerometer ourselves that can be placed between the GPS receiver and the PDA, and that then "augments" the NMEA stream with its own data, for heading, steering, and altitude changes. wouldn't that be cool?
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imapbox
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| Posted: Tue Aug 24, 2004 6:07 pm Post subject: |
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| lbendlin wrote: | | ahh, finally I got you on the right track. why don't we just go ahead and invent a 3D accelerometer ourselves that can be placed between the GPS receiver and the PDA, and that then "augments" the NMEA stream with its own data, for heading, steering, and altitude changes. wouldn't that be cool? |
what PDA ?
we don't even know the internals of the TTGO as of yet; the interest is there. don't even know if the GPS receiver sends NMEA data or proprietary (as with sirf* chipsets) |
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