Electronics > Beginners
Digital to analog help. New here, anything appreciated!
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AVcamp:
Hello!
Looking for some help and advice with an automotive project. I'm trying to interface a new ECU with the original speedometer in the car.
Original setup was a reluctor style sensor, frequency varies based on vehicle speed, 0hz to ~128hz. The speedometer board needs to see an AC signal, at least +-3v peak-peak relative to bat 0v to work correctly and is tolerant to >30v p-p. I have tested with a signal generator and it will take any kind of signal, square, sine, triangle, as long as it is in the correct voltage range and zero crossing.
The output from the new ECU is a 0-12v square wave and the speedo board doesn't do anything with the signal.
TLDR, looking for a way to level shift a 0-12v signal down to say a +-6v. Speedo measures at zero crossing point.
I am very much a hardware person. Honestly not all that sure where to start, this is outside of the kind of electronics work that I normally (rarely) do. Would like to have this as simple as possible, discrete is good and just for simplicity would like to avoid using a micro.
If there is anything else that I can add to help just say so. All for learning as much as I can, not in any kind of rush either.
Thanks in advance!
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