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ReBorne
Apprentece
United Kingdom
13 Posts |
 Posted - May 10 2004 : 7:32:48 PM
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Don't know if this will be of any use to anyone, but hey, you never know......
Anyone who is involved in the auto trade in any way will probably know that a majority of modern vehicles use a pulse somewhere in the system - easy way to tell is see if your radio has RDS - if so the vehicle has probably got a pulse. This is basically generated from the gearbox, and produces a 12v pulse which increases in frequency as the vehicle gains speed. On newer 'classier' cars (eg. Mercedes) these have now been replaced by a can-bus, which uses the pulses at a more rapid rate as a communication between systems. To gain a usuable pulse from these, you will need to purchase a can-bus interface from a reputable auto electronics company. Be careful though - get something wrong on a car with warranty, and you can guarantee that if ANYTHING electric goes wrong on the car the dealer will blame your handiwork and void the warranty.
The main reason I'm posting this is after reading the 'electronic speedo' posts. If the car is too old to have a pulse (eg. like my old Mini) then the easiest way to get one by far is to have a look in your local Yellow Pages for a taximeter fitting company, and get them to supply a pulse kit.....or get them to fit it. Basically you cut the speedo cable, fit a pulse generator in line and Robert is your Mother's Brother....... If your vehicle already has a pulse, these same guys will tell you which wire to use and where to locate it.
Now, while I know the vehicle side of it ( I'm an agent for a taxi meter which is built into the rear view mirror ;) ) I know sweet Fanny Adams about how to create a speedo from that pulse.
Interesting times ahead :D
(",)
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Finding a pulse......
