mahmood Elnasser wrote:
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Is v/f and f/v conversion at other end easier than PWM as Mr Michale stated?

Like you say, I don't think you have the time or luxury of doing this the perfect method - whatever that may be. Just get it working. An opto-isolated interface is nice and can be done, but high precision is tricky.

Erik's method V-F F-V is also do-able, but 12 bits will need a 4095:1 change in frequency...then you need to clip it up, feed it to the opto isolators, pick it back up and convert to volts again - with 12 bit precision.....

I tend to disagree Erik for my application which is sending dc level between 0 - 1 VDC to emulate a sensor reading for the software guys to start working on their project.
However V/F and F/V might be better solution for higher frequency signals. Would this method work to transmit isolated video signals?

Don't need to bother with V-f - its already AC, which fixes the problem with your system- you're using DC.


Steve