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Duck
Wow. I didn't think I was going to get so much help. Thanks people. Some of this
has gone over my head, though, I'm learning a lot of it by researching what you say.
I suppose I should have spelt it out better. The more info you have, the easier
it is to provide an answer. Chris Foley had it the closest. It's an automotive
application.
The Speed Sensor sends a 4000 pulse per mile sine wave. I've found a schematic
to convert this into a square wave. I want to display the speed in a graphical
display, and also be able to use formulas to convert to KM's and for a trip
computer/mileage display. I will be interfacing all the sensors, but the rest
seem much easier. I figure if I can interface the speedo, the rest shouldn't be
a problem. The tach will output 3 pulses per rpm. So, theoretically, the very
most I'd ever see would be about 400 hertz. The rest of the sensors are either
resistance or voltage.
Will I be able to read two different sets of pulses reliably? Perhaps I should
resort to using a PIC or other IC. Unfortunately this is being done on a tight
budget and a chip programmer would be another expense. Oh well. C'est la vie.
Anyway, thanks again for all the help so far.
Kris
has gone over my head, though, I'm learning a lot of it by researching what you say.
I suppose I should have spelt it out better. The more info you have, the easier
it is to provide an answer. Chris Foley had it the closest. It's an automotive
application.
The Speed Sensor sends a 4000 pulse per mile sine wave. I've found a schematic
to convert this into a square wave. I want to display the speed in a graphical
display, and also be able to use formulas to convert to KM's and for a trip
computer/mileage display. I will be interfacing all the sensors, but the rest
seem much easier. I figure if I can interface the speedo, the rest shouldn't be
a problem. The tach will output 3 pulses per rpm. So, theoretically, the very
most I'd ever see would be about 400 hertz. The rest of the sensors are either
resistance or voltage.
Will I be able to read two different sets of pulses reliably? Perhaps I should
resort to using a PIC or other IC. Unfortunately this is being done on a tight
budget and a chip programmer would be another expense. Oh well. C'est la vie.
Anyway, thanks again for all the help so far.
Kris