Findlay234
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| posted on 2/5/03 at 09:05 AM |
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Cheers for the new incentive guys, ive been working in swizerland for the last month so havent been able to do anything. sorry its taken so long, just
need to etch the circuit board and then plug everything in really.
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Dave_the_sparks
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 posted on 18/5/03 at 08:52 PM |
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immobilisers
If we are still chatting about immobilisers, im going to use a Scorpion transponder immobiliser, has a reciever loop placed behind the trim where the
ign key goes in, has a little key fob which hangs on your key ring, when you insert the key and switch the ign on the immobiliser reads the key fob
and disarms the system! very simple and is thatcham aproved to boot! It has all black wiring to confuse the prospective theif and cuts into the
cranking circuit and the coil feed or fuel pump supply. It has a little L.E.D. to show when its armed too! Its the same immobiliser that is fitted to
most Mercades cars that come off the production line at the moment (the chip is hidden inside the ign key) so if its good enough for them its good
enough for my Tiger. But i would say that because i am a Scorpion dealer ha ha. If any of you builders want one I can supply at discount prices, email
me and let me know.
p.s. good luck with the touch key project, sounds interesting.
mobile auto-electrical specialists www.hammondauto.co.uk
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Mr G
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| posted on 19/5/03 at 09:21 AM |
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Being able to supply it cheap is good - but - What about the installation certificate that insurance companies want to prove it was fitted by a
recognised professional and not joe public? I've always been up for installing one myself but hav'nt due to this issue.
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billy
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| posted on 19/5/03 at 09:46 PM |
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a valid point there mr g.id like to have a anti theft system fitted to my car simular to the ones ive seen in south africa.......when the thief trys
to steal it ,they get smoked by flame throwers out the side of the car.there take that thief...lol
luego-lo-cost finished,vauxhall 16v 2.0,twin 45s de-dion rear set up
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ned
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| posted on 20/5/03 at 09:01 AM |
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Fin,
Forgive my ignorance and lack of electrical expertise, but what would there be to stop a wannabe theif just bridging across the keypad and hot wiring
the circuit? or does it not work like that?
Cheers,
Ned.
beware, I've got yellow skin
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ceebmoj
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| posted on 20/5/03 at 09:56 AM |
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Hi all
Just my 2 worth but pending on the PIC you are using for this immobiliser it may well have some non volatile memory for user variables (I would say
all of them but there are hundreds and I only have experience with the devices towards the top end of the range).
This non volatile memory is very easy to use all you do is supply the address you wish to read/Wright to and the data. If any one is interested I can
give you some C functions for doing this alternately if you use assembly for your pic code I am sure there are some examples on the web and falling
that I am sure that the microchip manual for the particular PIC will tell how to do it. (sorry my assembly is a bit rusty)
non volatile memory = memory whose contence is not lost when power is removed
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Dave_the_sparks
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| posted on 20/5/03 at 10:33 AM |
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immobilisers
with regards to the installation certificate, i was just offering another solution to car security, its not like there will be a certificate that can
be sent with the touch pad immob is there!
Anyway, if any of you are in surrey and want one fitted i can do it for you so that you have a certificate to send off, normal price for a transponder
system is £145 fitted but i can supply and install to people on this site (providing you are in surrey or can get to me) for £105 if anyone is
interested? this is a legit offer too!
mobile auto-electrical specialists www.hammondauto.co.uk
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Findlay234
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| posted on 20/5/03 at 11:09 AM |
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Ok, ned, theoretically yes, a tea-leaf could plug in a 6v battery into the wires that go between keypad and relay. The plan is to have a ribbon cable
coming out the back, most of the wires going nowhere, so it deters a thief from trying to hot wire it with so many wires. Itl be safer than a kill
switch, but not as safe as a thatcham approved alarm, if you want one of those you can pay the £100, plus £100 for installation.... The sva require
you to have some form of immobilisation (they dont ask you to have it thatcham installed), this is a cost effect step up from a kill switch.
If the battery is disconnected the memory will remain intact and the the immobiliser will just reset when powered on again, as though nothing
happened. The relay is powered by the keypad so with power off it wont work. And BTW you should be able to disarm more than one circuit if you
wanted(with more relays), so making the job for the thief harder.
The bottom line is that where theres a will theres a way. Nothing will stop the most determined thief, not the thatcham cat1's or the
flamethrower (now illegal, even in South Africa BTW).
If you have anymore questions then just ask.
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Bob da builder
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| posted on 5/6/03 at 01:28 PM |
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Findley.
Hi Mate, Im still interested in your key pad, all that im interested in is keepin Mr. SVA happy!! im not planning on keeping may car unattended for
long and i just want a `trick` feature!! anyway if some one realy wants my locost then imobliser or not aint gonna stop them!! to the point im off to
the alps mountaineering for the summer, im back in september and will be doing my electrics then so i will be the guinnea pig if need be or if not ill
be paying cash for one!!
leave me a post on the foroum or email me with details etc.... will be in contact september time..
Happy building
Bob  
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Findlay234
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| posted on 5/6/03 at 02:02 PM |
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Roge-o sir. Have an excellent time, just think of us slaving away in sunny england
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Findlay234
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| posted on 5/6/03 at 02:19 PM |
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Right, a decision. In light of Neds words I wanted to make the system more tea-leaf proof, Im thinking of keeping the chip and the relay away from the
keypad, in their own box which can be hidden away from sight. The only wires that the thief could tamper with would be those going to the keypad. The
way the signal goes to and from the keypad, it would be harder to hot wire than to try and guess the code. Here comes the decision part..... for those
of you who have expressed an interest, would you want the keypad in a little box that you can mount somewhere with velcro or such like or would you
want to have it poking through the surface of your dash or tunnel. Its just that its quite difficult to find a box of the right size, that can be
easily waterproofed as well.
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Bob da builder
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| posted on 5/6/03 at 05:16 PM |
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Cheers mate, im sure that i will have a gud time!! personally i would perfere if it was not in a box then i can mount it into my tunnel for the
unique look!!!
keep one with my name on till september!!!!
cheers
bob.
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Findlay234
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| posted on 6/6/03 at 07:44 AM |
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Mate that helps so much, finding a suitable small plastic box is hell but if you and others just want the keypad then thats great, itll look as though
the car was built with it in and its not just an after thought.
BTW heres the maplin website showing the keypad ill be getting for the kit (the one im using at the mo is one i had before)
http://www.maplin.co.uk/Search/results.asp?hiddId=030606083604913&Criteria=keypad&CartID=030606083604913
The second one down! metal keys would be nice but its a tad pricey
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DaveFJ
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| posted on 6/6/03 at 08:07 AM |
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I have been looking for just such an item recently, the only one I could find is at the following link.....
http://www.astrogen.com/sc2001.htm
Certainly I would be very interested in your device. and just for my tupenny worth - I would like to see a seperate keypad that i could integrate into
my dash or tunnel.
Look forward to seeing the finnished item....
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Bob da builder
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| posted on 6/6/03 at 09:38 AM |
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findlay.
Me again.... if it is not a problem to you can you build mine with a metal key pad, well assuming that they are only £4 or so....more, i dont mind
paying a little more.... if its a problem then dont worry the plastic keypad will be great, cheers.
im on a friends computer now, wont have internet access till september now so gud luck and i will be in contact when im back.
just a thourght....are you going donnington?? from memory its bout 15th sept ish well im back then and will be going so maybe pick it up from you
then!???
cheers for your time mate, take it easy, have a good summer building!
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Jasper
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| posted on 7/6/03 at 09:48 AM |
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Just a quick reminder if people need one now and can't wait:
http://www.abacuscaralarms.co.uk/selca/mc2.htm
Cost me about £60, easy to install, lots of black wires to confuse theives, works loverly, cuts 2 circuits, flasing LED, and touch key fob.
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andyd
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| posted on 7/6/03 at 08:33 PM |
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Jasper, that link gives a "moved page" page. Can you post another link or give "directions" from their home page?
Andy
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Jasper
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| posted on 8/6/03 at 01:29 PM |
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Sorry chaps - looks like they no longer do them - I seem to remember the price was good cos he didn't have many left.
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MK7
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| posted on 8/6/03 at 10:12 PM |
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Is this the immobiliser / web page?
http://abacuscaralarms.co.uk/alarms/immobilisers/apollo2002.htm
£45 sounds reasonable, but I'm also interested in the home brewed version.
Russell
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blueshift
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| posted on 9/6/03 at 12:14 AM |
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glad someone woke this thread up so I saw it.. did any of these PIC-based immobilisers get built?
I am thinking of building my own now, I have some experience with PICs and electronics.. RS sells what sounds like a nice LED backlit keypad. could be
quite sexy.
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MK7
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| posted on 12/6/03 at 08:52 AM |
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Findlay,
are we on then?
I'd also opt for the metal keypad and pay the extra fiver.
What sort of timescales are we looking at for this and which circuits will need to be re-routed to the black box to get it running. I'm harness
building (actually stripping and rewiring) over the next couple of weeks so this is quite timely for me.
Regards
Russel
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Findlay234
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| posted on 12/6/03 at 11:42 AM |
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People seem to like the metal keypad dont they? Right then, as ive just looked at the sva manual..... doh, loadsa regs on electronic immobilisers. Its
got to be two circuits that it immobilises. So make some provision in the ignition circuit and the fuel pump circuit. Or any other circuit for that
matter, as long as it doesnt overload the relay current rating, which i dont know yet BTW as i havent got that far. 
As for timescales, well im being sent off to switzerland again next week so thatl slow me down but theoretically if i put the effort in i could get it
done in a few weeks.
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DaveFJ
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| posted on 12/6/03 at 12:15 PM |
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great - count me in - and I also prefer the metal keypad
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bob
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| posted on 13/6/03 at 07:54 AM |
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Fin
The extra few quid for the metal keypad seems worth it IMO.
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MikeRJ
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| posted on 13/6/03 at 09:46 PM |
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Mr Findlay234, you are a brave man! I used to build all sorts of stuff like this for friends, people at work etc. but it took far too much of my time
in the end (plus I program realtime embedded systems for living, don't want to do it at home as well!)
Anyway, if you are after a limited run of PCB's (rather than etching all of them yourself), I know several people that have used Olimex
(http://www.olimex.com/pcb/index.html) for prototype PCB's. They are easily the cheapest around ($21 for 160mm x 100mm with tinned tracks,
solder resist and silk screen), and they will panelise small PCB's for you. Only downside is you have to FAX your order to them.
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