Daniel,

Sorry, but I can't help you with your speedo project ... but if
you would limit your text line to 72 characters or less, more
people would read your posts.

Good luck,
 - Nick -

Daniel Nagy wrote:
>
> Ok, i got a question for you all. i've been working around PIC micro's for a l
ittle time now, done a Engine immobiliser / Central locking based around a 16F84
 with a RF receiver.
>
> Anyways, i'm working on a new little project. Its called a "Electronic Ratio B
ox" basically its used on Electronic Speedo's within Automobiles.
> a simple description on why i require it..
>
> I've got a modified car, where as i've changed the Diff Ratio gears, and for t
hose who have done this, you will notice your speedo is now also incorrect.. als
o in cases when you change the size of your Wheels. in my case. both. for those
who are interested, original Diff gears were 2.77:1, now i'm running 3.45:1 (but
 i've also got 4.11, 3.25 gears). anyways.. the principle is simple.
>
> the Speedo Sender is a Hall Effect sensor, which is a square wave output, vari
ed depending on the speed.
> i need this little circuit too interface between the Sender, and the speedo it
self.
>
> Also, i want to work with a PIC12C672, as it has a A/D conversion, where i wan
t to connect a trimpot upto (for adjustability, so i can adjust it depending on
tyre size, diff gears. ie 80% faster, or slower)
>
> just say the sender is sending 100 pulses
> i require this to send out <so many pulses> in the same time span. i believe y
ou all understand what i mean
>
> the problem is, i'm still fairly new to ASM, and i have no idea how i can do t
his.. any suggestions?
>
> Sent by YAP P/L at http://www.yap.com.au/