what kept ya
HAHAHA how long has it been?????? looked in the history and it turns out its been about a year now ive been doing this immobiliser.
i had it working on a 'cheese board' at christmas but was very crude and only tested the chip's programing. now i have a full circuit
including relay to switch on any auto circuit. all thats left is to put it in a box and provide an RF filter. I guess being away at uni for six months
of the year hasnt helped and whenever im back half the time im going out with mates or visiting uni mates.......
So the immobiliser...... type in a 4 digit code and it closes the relay allowing what ever circuit you immobilise to work. to open the relay again
just turn off the ignition and then 10 secs later it auto immobilises. There is also a valet function. Just seeing if there was still interest for
these. here was the original thread.....
http://www.locostbuilders.co.uk/viewthread.php?tid=3034
btw ill be using it in my car because im at the wiring stage at the moment.
cheers
fin
You coming to Walton this weekend or Newlands on the 1st?
Bring it along...
James
Yep still interested....
Any idea on a final price ?
Have you fully tested it yet ?
A friend was working on one a while back and found that when the ignition was turned the drop in voltage to the imobiliser triggered it so he
couldn't start his car........
Ill try and make it to Newlands..... If i do go ill bring it along.
Yeah, interested.
definately interested sounds perfik
fin
what kept ya
yes, intrested...price deppendent of course!
tim
sorry bob, i know you always wanted one!!! still a few more things to get sorted tho, works fine with batteries but well see when i get it hooked into a running car......... gotta check out this spiking thing and whether itll be affected much, ive got an inductor and a fairly large capacitor to help reduce the porblems.
I ignition/start moule I have on my car suffered with spiking, would re-immobilise when the starter was operated. mate at work built a mark 2 version
that has been fine, but took a bit of sorting out.
If you get a similar problem I'll post the diagram/architecture for comparison.
Keypad sounds better as I still have to carry a little button like they use on pub cash tills.
John
quote:
Originally posted by Findlay234
gotta check out this spiking thing and whether itll be affected much, ive got an inductor and a fairly large capacitor to help reduce the porblems.
Just to bring this one back to the top.......
Have you had any further success?
I am currently sorting my wiring and have been looking but no-one seems to sell exactly what I want....
For my home-built immobiliser I used a 3-pin voltage regulator that was specifically designed for car use - resistant to spikes, 2x over-voltage,
reverse voltage (in case the battery is connected backwards!), and so on.
The circuit has proved to be interference-resistant so far, with just a resistor (current limiter), 100uF electrolytic and one or two 0.1uF ceramics.
If you want to know the type number let me know - I'll dig it out.
David
Look in 'Locost related'. I posted about a Microscan Immobiliser that is Thatcham 2 approved and meets SVA and Insurance requirements.
I have ordered one from a company that is £10 cheaper than manufacturers and delivers overnight.
One of my requirements was low current consumption. This unit only consumes 5mA.
The Caterham guys fit the loop aerial under the handbrake finger cutout. Dropping the small transponder into that cutout allows keyless ignition.
I have the starter button and flipswitch fitted, having removed all other security devices. This should meet my insurance requirements now and help
secure the car.
[Edited on 14/9/04 by Rob Lane]
Thing is I really WANT a keypad arrangement...
OK understood. 
Watch out for standby current requirements though. This can easily flatten a battery on a stored car.
I keep my battery on a conditioner when cars not in use, keeps battery perfect during winter layoff.
I'm interested in a keypad immobiliser. was thinking of rolling my own, but prob more sense to buy a proven one if it's a decent price.
This is the immobiliser I went for 
I added another relay which worked from the ignition so it doesn't cut the engine if the button is pressed while the car is running.
I've put the whole lot into a black box I got from maplin and there are about 9 brown wires leading from it and into the wiring loom.
At the moment it just cuts the LT lead but it can be used on other circuits.
Right after a good while researching the best methods for spike protection ive found something at work. bit of a cheat i know but itll help me. ive been working at halfrauds over the last few weeks (try and recover some of the debt built up over the year at uni). what i found was a spike protector for an audio system so i stripped it and then had a look inside, now just looking on the net for the same components. will keep you posted..... soon hopefully.
Fin
Not taken long this project then,LOL
Hahahaha, good banter but yeah what about my car tho havent exactly been doing that fast either, i think its due to me being very lazy, oh and the fact that ive been at uni for 6 months of the year. Im planning to take the car up to uni tho this term so should get a bit more done.
Fin
Taking the car up to uni is not a bad idea,hopefully we will catch up soon.
quote:
Originally posted by Rob Lane
Look in 'Locost related'. I posted about a Microscan Immobiliser that is Thatcham 2 approved and meets SVA and Insurance requirements.
I have ordered one from a company that is £10 cheaper than manufacturers and delivers overnight.
One of my requirements was low current consumption. This unit only consumes 5mA.
The Caterham guys fit the loop aerial under the handbrake finger cutout. Dropping the small transponder into that cutout allows keyless ignition.
I have the starter button and flipswitch fitted, having removed all other security devices. This should meet my insurance requirements now and help secure the car.
[Edited on 14/9/04 by Rob Lane]
Try this link, it's near bottom of page as MI600 immobiliser.
http://www.dyor.co.uk/car_security.asp