More temp probes

ScottT · Post by **ScottT** » Mon Mar 18, 2013 8:11 am

Is it possible to have more than 3 temperature probes on a Reef Angel?

rimai · Post by **rimai** » Mon Mar 18, 2013 8:24 am

Yes, but the controller only has 3 ports.
You would need to splice an extension to have more ports.
The other thing that would need to be done is libraries changes. It's hard coded to only 3 probes right now.

ScottT · Post by **ScottT** » Mon Mar 18, 2013 9:29 am

Thank you,
I'm not up for that quite yet, but maybe one day. Three will do for now

Piper · Post by **Piper** » Mon Mar 18, 2013 9:51 am

Roberto - Is there a limit on the probes if you splice like that?

rimai · Post by **rimai** » Mon Mar 18, 2013 10:00 am

I think just RAM memory constrains.
You will probably start seeing errors when the capacitance hits a certain level.
More cable = more capacitance and the pull-up resistor can't keep up to pull the data line as fast as the signal needs to be, which will cause errors.
At this point, I'm sure there are dedicated chips to pull-up the data line faster than a single resistor.

Piper · Post by **Piper** » Mon Mar 18, 2013 11:54 am

I'm still on chapter 1 in my Electronics for Dummies book so maybe I need to rephrase my question

I can probably get away with 5 total if I wanted to, yes?

rimai · Post by **rimai** » Mon Mar 18, 2013 1:11 pm

You should be fine with 5

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