I am reading temperature using a 10K thermistor. I am feeding this thermistor as the input to a solar hot water controller which uses a microcontroller in there somewhere. I would also like to feed this same thermistor as input to an A/D converter board for monitoring purposes. Actually I have 5 thermistors and only one at a time is used by the controller. I would like to read the status of all of them using the A/D. I could use a rotary switch to choose which one at any given moment goes to the controller, while the rest go to the A/D. That's sort a cheesy work-around... kind of amateurish in my opinion. Can I just run parallel leads... one to each device? If I do, theoretically one device will load the other to some extent. I presume both devices have high impedance inputs, so that loading should be minimal. But tech support for one of the devices tells me not to do it. I know he has to think of liability. But what is the right way to do this? I suppose some sort of buffer device exists... one in to many out. Or does it? Or is there an easy simple way to do this?
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