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'[OT] 64-Kb Shift Register or Maybe a FIFO'
2000\05\17@212140 by Martin McCormick

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       I need to delay a bit stream of audio for one second.
What would work is a 65536-stage shift register because all that
needs to happen is for a bit to start at Stage 1 and march
through the register until it appears at the final stage.  That's
it.  Just clock and data.

       Obviously, if there is a shift register or something that
can easily be made to behave like one that has 16 Kb or 32 Kb or
is variable between 0 and 65536 bits, that would be gravy, but I
need to delay the stream for 1 second.  That is the most
important feature, and the data are serial so only one bit is
needed.

Martin McCormick WB5AGZ  Stillwater, OK
OSU Center for Computing and Information Services Data Communications Group

2000\05\17@213425 by Sean Breheny

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Hi Martin,

There are devices like that called "Bucket Brigade Devices". Check for
them in the digikey catalog.

Sean


On Wed, 17 May 2000, Martin McCormick wrote:

{Quote hidden}

2000\05\18@012955 by Robert Bednarz

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take a look at Electronic Design   May 15, 2000
ideas for design
FIFO Simulates Large Shift Register
by Massimo Gottardi

bucket brigades are for analog signals

Bob

{Original Message removed}

2000\05\18@013435 by vrf.craig

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Hello guys... here's an interesting thing to see if someone's got it already:

Anybody ever take a small accelerometer and use a pic to read its data state, and to record calculated telemetry data from, say, a remote controller car or remote controller airplane?

Knowing the weight of the vehicle, couldn't we translate the acceleration of the vehicle into speed, Gs, pitch, and bank?

Anybody got any ideas?

Thanks!
 {Original Message removed}

2000\05\18@014042 by Dale Botkin

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Been done, though not with a PIC.  G-Cube, G-Tech, and similar products
are in use by road racers, autocross drivers, and the occasional drag
racer.  I think the G-Tech, at least, is 68HC11 based, though I could
certainly be wrong.

Dale

On Thu, 18 May 2000, vrf.craig wrote:

> Hello guys... here's an interesting thing to see if someone's got it already:
>
> Anybody ever take a small accelerometer and use a pic to read its data state, and to record calculated telemetry data from, say, a remote controller car or remote controller airplane?
>
> Knowing the weight of the vehicle, couldn't we translate the acceleration of the vehicle into speed, Gs, pitch, and bank?
>
> Anybody got any ideas?
>
> Thanks!
>   {Original Message removed}

2000\05\18@014456 by David Duffy

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<x-flowed>Martin wrote:
> >         I need to delay a bit stream of audio for one second.
> > What would work is a 65536-stage shift register because all that
> > needs to happen is for a bit to start at Stage 1 and march
> > through the register until it appears at the final stage.  That's
> > it.  Just clock and data.
> >
> >         Obviously, if there is a shift register or something that
> > can easily be made to behave like one that has 16 Kb or 32 Kb or
> > is variable between 0 and 65536 bits, that would be gravy, but I
> > need to delay the stream for 1 second.  That is the most
> > important feature, and the data are serial so only one bit is
> > needed.

Is the bit stream really that slow ? (8KHZ & 8-bit ?)
Regards...

</x-flowed>

2000\05\18@023127 by Sean Breheny

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Hi Bob,

Yeah, I wondered about that when I was typing my previous message. I guess
I never looked closely enough at the description in the catalog.

Thanks,

Sean

At 01:12 AM 5/18/00 -0400, you wrote:
>
>bucket brigades are for analog signals
>
>Bob
>

|
| Sean Breheny
| Amateur Radio Callsign: KA3YXM
| Electrical Engineering Student
\--------------=----------------
Save lives, please look at http://www.all.org
Personal page: http://www.people.cornell.edu/pages/shb7
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2000\05\18@030546 by Sean Breheny

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Hi,

I'm a part of a team here at Cornell which is doing that, although with an
AVR. We built a 3-axis
gyroscope/accelerometer inertial measurement unit and put it in a small
helicopter to do autonomous control. In fact, tonight was the first night
we had success, we actually did 1 degree of freedom control (yeah, 1 degree
of freedom is not impressive, but it was mainly to test all the elements of
our system).

At this point, our web page is months out of date, but over the summer,
someone who is staying here is going to be updating it, so we should have
information on there in not too long.

Sean

At 01:36 AM 5/18/00 -0700, you wrote:
>Hello guys... here's an interesting thing to see if someone's got it already:
>
>Anybody ever take a small accelerometer and use a pic to read its data
state, and to record calculated telemetry data from, say, a remote
controller car or remote controller airplane?
>
>Knowing the weight of the vehicle, couldn't we translate the acceleration
of the vehicle into speed, Gs, pitch, and bank?
>
>Anybody got any ideas?
>
>Thanks!

|
| Sean Breheny
| Amateur Radio Callsign: KA3YXM
| Electrical Engineering Student
\--------------=----------------
Save lives, please look at http://www.all.org
Personal page: http://www.people.cornell.edu/pages/shb7
.....shb7KILLspamspam@spam@cornell.edu ICQ #: 3329174

2000\05\18@040625 by Alan B Pearce

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>Anybody ever take a small accelerometer and use a pic to read its data state,
and to record calculated >telemetry data from, say, a remote controller car or
remote controller airplane?

>Knowing the weight of the vehicle, couldn't we translate the acceleration of
the vehicle into speed, >Gs, pitch, and bank?

This scheme has been used in an electronics magazine to make an inclinometer, I
think it was for model train use. A National Semiconductor accelerometer was
used, and while mobile a calculation of the horizontal and vertical forces was
made to calculate the gradient of the track. If I remember correctly it was in a
European magazine called Elektor.

2000\05\18@064147 by Thomas C. Sefranek

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Martin McCormick wrote:

>         I need to delay a bit stream of audio for one second.
> What would work is a 65536-stage shift register because all that
> needs to happen is for a bit to start at Stage 1 and march
> through the register until it appears at the final stage.  That's
> it.  Just clock and data.

So you are running up to 65K bits per second.
At 8 bits per word you really have 8Kbytes per second.
That's low fidelity audio.
But maybe you are doing something different.

>         Obviously, if there is a shift register or something that
> can easily be made to behave like one that has 16 Kb or 32 Kb or
> is variable between 0 and 65536 bits, that would be gravy, but I
> need to delay the stream for 1 second.  That is the most
> important feature, and the data are serial so only one bit is
> needed.

My first idea  is to use 4 8 bit shift registers in series and whent hey
accumulate 32 bits
parallel transfer them to 2K IDT FIFOs.
You can use static RAMs too.
On the other end, use 4 parallel to serial shift registers.

>
>
> Martin McCormick WB5AGZ  Stillwater, OK
> OSU Center for Computing and Information Services Data Communications Group

--
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 |  __O    Thomas C. Sefranek   tcsspamKILLspamcmcorp.com
 |_-\<,_   Amateur Radio Operator: WA1RHP
 (*)/ (*)  Bicycle mobile on 145.41, 448.625 MHz

hamradio.cmcorp.com/inventory/Inventory.html
http://www.harvardrepeater.org

2000\05\18@075616 by Martin McCormick

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David Duffy writes:
>Is the bit stream really that slow ? (8KHZ & 8-bit ?)

       No.  I am a little hazy on this one, but the codec I will
use is either sending 32 kilobits or 64 kilobits per second.  The
samples are at 8KHZ to give an upper audio frequency of 4KHZ.

       This means that the 64 Kb shift register will either give
me a 1 or 2-second delay.

2000\05\18@081440 by Jon Hylands

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On Thu, 18 May 2000 01:36:00 -0700, "vrf.craig" <.....craigKILLspamspam.....VRF.COM> wrote:

> Anybody ever take a small accelerometer and use a pic to read its data state, and to record calculated telemetry data from, say, a remote controller car or remote controller airplane?
>
> Knowing the weight of the vehicle, couldn't we translate the acceleration of the vehicle into speed, Gs, pitch, and bank?

The Analog Devices ADXL202 or ADXL210 are ideal for this kind of thing...
2-axis accelerometer, digital PWM interface, $30 for an eval board you can
stick right into your circuit...

I'm interfaced a 16F84 to one, its dead easy. Four pins (and two are ground
and power). They make fantastic tilt chips as well -- real time 2-axis tilt
with 30mA of current (and you can shut down between readings as well).

Later,
Jon

--------------------------------------------------------------
  Jon Hylands      EraseMEJonspam_OUTspamTakeThisOuThuv.com      http://www.huv.com/jon

 Project: Micro Seeker (Micro Autonomous Underwater Vehicle)
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