Voltage Divider Resistors - with 15 inputs, choose value greater than 10k?

Emoncms
21

And, remember, because all the inputs are biased off the same source, they’ll all be at the same voltage. The implication of this: you only need one low-pass filter (probably on the voltage input) to derive the count that will remove the d.c. offset in all the other inputs to to that processor (because they all use the same ADC, it should be exactly the same value for each).

You don’t have to do this, emonLib will work fine anyway. (In fact, what you gain in samples per second probably won’t be worth the trouble.)

22

uh oh, low pass filter? Is that something else I am forgetting about, or is that something I have already created and only need to use once?

23

It’s part of emonLib. I wouldn’t worry, unless you’re desperate to have a better sampling rate, and even then it will make only a few percent difference.

24

good news. This sounds like something I can address later pretty easily.