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I see how my example could be construed as trying to achieve 0-5v. I've already decided I'm going to use a voltage divider to prevent damage of the arduino. Let's forget about U and U max for a...

It appears that this won't work for what I'm trying to achieve.

@itsmorefun is there another way to get 0-10v to send a signal based on pH value? For example if pH = 8.00 can I program profilux to...

Oh... Got it.

Gaël, thanks so much for helping me understand this.

Jimmy

That was a piece of the puzzle I was unaware of. It does send 0.5v to relay1 when it's above nominal value and 0v when below. Am I correct to assume that 0.5v is the relay output when on?

Thank You Gaël,

That seems to help a lot. However, I'm not experiencing the -10v when you go below nominal value. It's + in both directions.

Can you expand on this by giving examples? I can't wrap my mind around what you're telling me?



proportional how? in both directions? And what is the range of the 0-10v output? How far is the...

Morning all,

I'm trying to figure out how the 1-10v logic interacts with the pH. I was hoping that the analog voltage would be linear based on the pH reading but when I probe the 1-10v and ground...