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Author Topic: Automotive Gauge Sin/Cos  (Read 1032 times)
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Lenexa, KS
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I have hit a bit of a roadblock on my latest project. I am trying to use an Arduino to drive the Speedometer and Tachometer from a 92 Acura Legend. I purchased the dashboard from E-bay, and dismantled it to find that the gauges are actually controlled via 3 contacts marked SIN/COM/COS.  I had assumed incorrectly that the gauge was a simple spring resistance volt meter. Frustrated I sent the whole project aside...

I was able to find this:
http://www.onsemi.com/pub/Collateral/CS8190-D.PDF
But have been unable to find the chip for sale (for a reasonable price).

So here I ask for some help, I simply do not know where to begin. I get the feeling that this is not going to be as simple as driving the SIN and COS point with but I really don't know.

Any direction provided would be much appreciated.
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We did something similar where I work a while back. I will see if I can get some details. I remember it was a pain to get those gauge driver's working but it can be done. I might be able to help with the chip also.
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Lenexa, KS
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4fun,

Wow, that would be great! I would love to complete this project.

Please! let me know if there is anything that you need from me.

I look forward to your reply.
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Sorry for the delay, the part numbers for the gauge drivers I got from my buddy at work are as follows. He did the figuring out on this one so this is all I have I am afraid.

CS4122XDWF24 IC DRIVER TRIPLE AIR CORE 24SOIC
CS4192XDWF16 IC DRIVER AIR CORE SINGLE 16SOIC
CS8190ENF16 IC DRIVER AIR CORE SINGLE 16SOIC

As my friend reminded me he had a time of it finding out which pin needed +sin -sin etc. You may need to work all of the permutations. Try Digikey for the parts. Good luck.
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FindChips.com shows mouser and digikey both stock the CS8190 in PDIP and sell in single quantities.
Mouser: $3.95
Digikey: $4.24

If by "for a reasonable price" you mean "less than $3", I wouldn't expect much; ONSemi's budgetary price is $2.0933 so unless you're picking up 10,000 or more, expect some markup.
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How do you guys plan to create the FREQin for the CS8190?
I'm currently trying to get the same "thing" working, some hints appreciated smiley

Greetings.
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Lenexa, KS
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So, I would like to be able to say that I have been hard at work on this one. But no such luck. This particular project has been put on the back burner.

I will be sure to post what I know when I know something.  Thanks to all the positive responses.
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