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'virtual car'
2000\03\07@010136 by Tony Nixon

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Whew!!

Finally got somewhere with this project.

I've now got a PIC16F877 talking to another PIC16F877 over a radio link.

The first PIC monitors steering and throttle positions from the virtual
car, plus some other stuff and relays all the info to the other 877.

This then tells two 12C672's to move the real thing via some rather
large servos.

I just blew a 10A fuse trying to do a quick steering direction change,
but I noticed the motor manufacturer specified up to 20A when this
happens, so maybe a 30A fuse is needed. The motor is braked when told to
stop or change direction, so I may have to put in a bigger dead time as
well. It's pretty hairy the first time you apply power to these things
considering the power behind them and not exactly knowing what's going
to happen. You can take all the precautions in the world, but there's
always some little thing you forgot :-)

Still,  it's somewhat gratifying to know the darn thing works thus far.
The MOSFETs didn't even get warm during fairly hard testing.

I was a little bit worried how the PIC would perform being on the same
PCB as the power drivers, but it seems to handle things ok. It uses a
seperate power supply and controls the power section via opto couplers.

One interesting thing. The MOSFETs are rated at around 70A, but the
leads look smaller than a 7805 regulator. I wonder if thay could
actually carry that amount of current.

--
Best regards

Tony

http://www.picnpoke.com
spam_OUTsalesTakeThisOuTspampicnpoke.com

2000\03\07@020150 by David Covick

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> One interesting thing. The MOSFETs are rated at around 70A, but the
> leads look smaller than a 7805 regulator. I wonder if they could
> actually carry that amount of current.
>
Tony,
The lead size on the MOSFET's is dependant on the "resistance", rather than
the "diameter.

Sounds like a great project you are working on!!!!!!!



{Original Message removed}

2000\03\07@021445 by Robert Rolf

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Tony Nixon wrote:
{Quote hidden}

So use a high wattage light bulb as your self resetting fuse. It has a
low resistance as long as the current is low enough, and then develops a
very high resistance once that threshold is crossed (I.E. quite
non-linear just like a varistor). It also flashes to let you know
that you've gone overcurrent.

2000\03\07@122340 by jamesnewton

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My father and I have done this in the past with good results. As the
filament heats, its resistance increases and the circuit is automatically
protected. Under normal operation, below the operational current of the
bulb, very little power is dissipated. It does not protect will against
spikes, however.

---
James Newton .....jamesnewtonKILLspamspam@spam@geocities.com 1-619-652-0593
http://techref.massmind.org NEW! FINALLY A REAL NAME!
Members can add private/public comments/pages ($0 TANSTAAFL web hosting)


{Original Message removed}

2000\03\07@175928 by Tony Nixon
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Robert Rolf wrote:

> So use a high wattage light bulb as your self resetting fuse. It has a
> low resistance as long as the current is low enough, and then develops a
> very high resistance once that threshold is crossed (I.E. quite
> non-linear just like a varistor). It also flashes to let you know
> that you've gone overcurrent.

I just tried a 40W bulb, and the motor sang "Sweet Adeline" :-)

Maybe I can double the use of the bulb for a hazard light on top of the
car.


--
Best regards

Tony

http://www.picnpoke.com
salesspamKILLspampicnpoke.com

2000\03\07@183913 by Rick

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maybe i missed something in the original post...but what exactly is a
"Virtual Car"?

Rick
{Original Message removed}

2000\03\07@190454 by Tony Nixon

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Rick wrote:
>
> maybe i missed something in the original post...but what exactly is a
> "Virtual Car"?

Nothing :-)


Actually, I am designing a project whereby you can drive a car remotely.


--
Best regards

Tony

http://www.picnpoke.com
.....salesKILLspamspam.....picnpoke.com


'Virtual Car'
2000\04\11@003242 by Tony Nixon
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Hi all,

Just thought I'd say that the first real test of this system went ok
today.

All of the projects "funders" were quite impressed.

I don't think I flinched when the vehicle hit the concrete barrier, but
I might have :-)

The car is unrecognizable, and will have to be cut apart to recover
what's left of the gear. I'll be interested to see if the PIC's still
function.

Not bad, I think, considering the development time was cut by 9 weeks.
I'm sure none of the people "up top" understand the complexities of
creating something like this just from a simple idea.

Time for a beer now I think - and relax before the next version.

--
Best regards

Tony

http://www.picnpoke.com
EraseMEsalesspam_OUTspamTakeThisOuTpicnpoke.com

2000\04\11@003956 by Sean Breheny

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Congrats, Tony!

You mean, your car was supposed to hit a concrete barrier on its first
run?! <VBEG>

Sean

At 04:07 PM 4/10/00 +1000, you wrote:
{Quote hidden}

| 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\04\11@200538 by Tony Nixon

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Alice Campbell wrote:
>
> congratulations, i think, on smashing your new pic project to
> smithereens.  However, if i had known you were going to just going
> to smash it into a wall, i would have sent over my ex-husband, and
> saved everyone the price of an innocent pic.
> alice

|-))

I just turned the system back on and all is well. It seems the PIC's are
rugged little chaps after all.

There's a bit of battery acid splashed here and there, so I would
envisage a total rebuild just in case. The crystal is now sporting a
nice head of fuzzy stuff and could do with a trim.

Considering these boards were all prototypes, hand made and have heaps
of mods patched all over the back of them, they didn't do too bad.

I'm pretty sure I can simplify the design and use a single board with
one 16F877 in control, but my guess is, now that the LEDs lit up, they
will want to use it again ;-)

--
Best regards

Tony

http://www.picnpoke.com
KILLspamsalesKILLspamspampicnpoke.com

2000\04\11@201403 by Alice Campbell

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D
> I just turned the system back on and all is well. It seems the PIC's are
> rugged little chaps after all.
>
> There's a bit of battery acid splashed here and there, so I would
> envisage a total rebuild just in case. The crystal is now sporting a
> nice head of fuzzy stuff and could do with a trim.
>
seriously, i would just wash everything well with deionized water
and a mild detergent and blow them dry-- they will probably be fine.
I just the other week spilled coffee on my keyboard, and thats the
standard protocol.  deionized water just wont hurt electronics if
they arent turned on when wet.


> Considering these boards were all prototypes, hand made and have heaps
> of mods patched all over the back of them, they didn't do too bad.
>
and doubtless knitted from hand-spun wire.
> I'm pretty sure I can simplify the design and use a single board with
> one 16F877 in control, but my guess is, now that the LEDs lit up, they
> will want to use it again ;-)
wheeeeeeeeeeeeeeeeeeeeeeeeeeeeee--ha
>
have fun with the next one.

a.

2000\04\12@101650 by Wagner Lipnharski

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Film makers use explosive and gasoline to do the same you did with a
PIC. They use the remote just to detonate, at least fast results I
think... :)
Instead to drive the car horizontally (as you did), their remote drives
the car vertically... :)

Tony Nixon wrote:
{Quote hidden}

2000\04\12@102106 by Wagner Lipnharski

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Several opportunities I found electronic boards from printers, monitors,
machinery in general, used by rats and roaches as home-sweet-home, or as
their preffered bathroom.  I believe that de deionized water should be
the best, but I always used plain tap water with lots of detergent and
regular soft brush to wash it all, lots of water to remove the foam,
then a nice air dryer (lots of air flow) to remove all the hidden water
drops in between the components.

Wagner Lipnharski
Orlando, Florida
http://www.ustr.net

{Quote hidden}

2000\04\12@185452 by Tony Nixon

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Wagner Lipnharski wrote:
>
> Several opportunities I found electronic boards from printers, monitors,
> machinery in general, used by rats and roaches as home-sweet-home, or as
> their preffered bathroom.  I believe that de deionized water should be
> the best, but I always used plain tap water with lots of detergent and
> regular soft brush to wash it all, lots of water to remove the foam,
> then a nice air dryer (lots of air flow) to remove all the hidden water
> drops in between the components.

I've seen TV sets hosed out in the back yard to remove the crud that has
accumulated over the years. When dried out thouroughly, they worked like
a charm.

I don't think you need a detergent in this case, there are enough soaps
on the TV already ;-)

Days Of Our Dreary's
As The Stomach Turns
etc
etc...

--
Best regards

Tony

http://www.picnpoke.com
spamBeGonesalesspamBeGonespampicnpoke.com

2000\04\13@080511 by paulb

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Tony Nixon wrote:

> I've seen TV sets hosed out in the back yard to remove the crud that
> has accumulated over the years.  When dried out thouroughly, they
> worked like a charm.

 Since (decent, something we really enjoy in this country so far) tap-
water is a fairly good insulator, this should work fine, as long as you
manage to flush out *all* the cocky-poo etc.

 Hair dryer.
--
 Cheers,
       Paul B.

2000\04\20@123207 by MegaBolt

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You have a web for the proud display of your virtual car?
Like to see it.

CHL
----- Original Message -----
From: Tony Nixon <TakeThisOuTTony.NixonEraseMEspamspam_OUTENG.MONASH.EDU.AU>
To: <RemoveMEPICLISTspamTakeThisOuTMITVMA.MIT.EDU>
Sent: Sunday, April 09, 2000 11:07 PM
Subject: Virtual Car


> Hi all,
>
> Just thought I'd say that the first real test of this system went ok
> today.
>
> All of the projects "funders" were quite impressed.

2000\04\27@211617 by Tony Nixon

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MegaBolt wrote:
>
> You have a web for the proud display of your virtual car?
> Like to see it.

I don't have any rights to the project, so unless those that do put it
on public display, I can't actually show anything. Sorry.

--
Best regards

Tony

http://www.picnpoke.com
salesEraseMEspam.....picnpoke.com


'virtual car'
2000\05\22@001145 by Tony Nixon
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Hi all,

I don't know if anyones been interested, but I've just completed 3 tests
of the virtual cars. Two of the new vehicles were written off totally
after impact with barriers, and one survived reasonably well.

The original PICs are still functioning, 3 are inside the vehicle.

Those miniature CMOS cameras are pretty tough. The one we are using has
survived the 3 impacts and is still working. It got pushed out the
windscreen by the dashboard on the first test and we found it about 30
meters away in a paddock. The last car flipped on it's roof and ground
some of the camera into the bitumen as it skidded to a halt. The PIC
controlling the car was still alive then, because I saw the brakes come
on while it was upside down. A bit useless though ;-)

I have to say, it is an experience driving a vehicle at 110 KPH
controlled by a handful of PICs and a mini camera to 'see' by. It's very
spectacular at the end and I'm sure I flinch when the cars finally come
to grief. It surely will be the most expensive Nintendo game I'll ever
play :-)

I've been using ROMzap to 'fiddle' with the software in the field using
a laptop which has saved untold time. FLASH is definitely the way to go
with projects like this.

Just 4 more to go and then back to reality.

--
Best regards

Tony

http://www.picnpoke.com
EraseMEsalesspampicnpoke.com

2000\05\22@012402 by Plunkett, Dennis

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Gee I hope that this is not the access car!

Dennis

{Quote hidden}

2000\05\22@074641 by Andrew Kunz

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It would sure be nice to have some videos from an on-board camera.

Andy

2000\05\22@192054 by Tony Nixon

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Andrew Kunz wrote:
>
> It would sure be nice to have some videos from an on-board camera.
>
> Andy

I've taken two already and should have had three. It is very stressful
just before driving the thing when 100 pairs of eyes are focussed on you
at the controls. As such I forgot to set the video for the last test,
which was a shame because it was the wildest ride yet. The video didn't
give out until the vehicle actually stopped on it's roof and the PIC
shut down everything. Because you are seeing this through a virtual
headset, it really makes your brain wonder what is going on.

I make the videos for two reasons, one to see how well the vehicle was
kept on line, and second, the video transmission has digital speed
information mixed in after the receiver so I can keep a record of this
as well. The penny pushers also like to see this stuff for thier
records. Unfortunately, they own the videos so I can't share them around
unless they publicly release them.

I actually control the vehicle's accelerator from a 'dummy' accelerator
under my own foot. Even though I can manually change speed, I just have
to 'floor' it and after the target speed is reached the PIC takes over
and keeps it fairly constant. I tried to control both speed and steering
manually at first, but it is very difficult at high speed. Steering is
reasonably easy once you have confidence in the system.

In the one we are doing tomorrow, I have to steer the car around a 30
degree bend at 40KPH, then accelerate to 80KPH before impact. This will
be tricky especially since my sight is not much more than 2 dimensional
tunnel vision. It would be interesting to see if two video cameras could
be set up for stereo vision to see how much spacial improvement it
gives.

It's funny because you have to try hard to stop turning your head when
you want to 'look out the side window'.

--
Best regards

Tony

http://www.picnpoke.com
EraseMEsalesspamspamspamBeGonepicnpoke.com

2000\05\22@230426 by rottosen

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Tony Nixon wrote:
{Quote hidden}

A few years ago a friend and I did stereo video using a pair of
industrial grade cameras that I had on loan. I added a video multplexer
that switched between cameras at vertical field rate. To do this, the
cameras must be gen-locked.

The two fields (one from each camera), together, are a standard TV
video. This allows recording with a normal video recorder.

Viewing is done by a pair of LCD shutter glasses switched at the same
vertical field rate using an LM1881 to get the field signal off the
video.

Unfortunately no cheap CCD cameras that are gen-lockable are yet
available in my personal budget.

If you ever want to try this, drop me a note and I will dredge up what
notes I have  :-)


-- Rich


>
> --
> Best regards
>
> Tony
>
> http://www.picnpoke.com
> RemoveMEsalesKILLspamspampicnpoke.com

2000\05\31@093428 by Larry P. Thomas wa0gwa

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<x-flowed>>It would be interesting to see if two video cameras could
>be set up for stereo vision to see how much spacial improvement it
>gives.

The army was doing this for a remote mine sweeper using some video
transmitters I designed some 12 years ago.  I had the opportunity to see
and view the results of the work.  The used two cameras on a rack and
pinion which allowed them to vary the camera to camera spacing.  Each
camera had its own transmit frequency to two separate monitors using
polarizing filter material and semi silvered mirror/glass so both eyes saw
both monitors and the viewer used polarizing glasses to direct the
images.  It would be interesting to genlock the two cameras together and
let one contribute to the RED and the other contribute to the GREEN or BLUE
of a composite NTSC color signal to a single monitor and them use the
typical 3D glasses that show up from time to time.

BTW, the used stereo sound also which really tended to cause you to want to
turn your head to see where the sound was coming from.  All in all it was a
weird trip to see the TV screen pop into 3D once the eyes and brain figured
out what it was receiving.

Later
Larry

- Imagine it / Achieve it - Dream it / Become it -
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