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Opensprinkler boards Round 2 Q & A

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xrapidx:
Thought this could be a Q&A thread relating to the use and installation of these boards:


Ref:
Sale thread: http://www.avforums.co.za/index.php/topic,58271.0.html
&
Initial thread: http://www.avforums.co.za/index.php/topic,44460.0.html
&
Sale: http://tangtechnologies.spaza.co/

Heinrich:
1st round of questions:

would i be able to add level limit switches and only have the system come on when the water level is enough without having to connect it to the rain sensor input?


is it possible to adjust the time each zone will be on measures against water level?

tangmonster:
Thanks , yes this makes sense

Hi All


The basics of powering show very good in the below picture:

NO 5v is needed for PI. IN fact i didn't put in protection so don't plug in usb power and AC power, something will blow up.

ONLY 24V AC.

The onboard circuit regulates the 24Vac to 5V dc to power the pi Directly from the Header.
The Pi then has in onboard 3.3V regulator.

This regulator is used to power other circuits like the DS1307 RTC etc.

You cannot power the board with DC, At least the pi should work but the TRIACS can only switch AC which 99% of all solenoids use. You do get DC latching solenoids but that is a very speciality item that needs a whole different circuit.

tangmonster:

--- Quote from: Heinrich on November 09, 2016, 09:02:15 AM ---1st round of questions:

would i be able to add level limit switches and only have the system come on when the water level is enough without having to connect it to the rain sensor input?

is it possible to adjust the time each zone will be on measures against water level?

--- End quote ---


At this stage I don't know of any way to do that on a zone specific way.

The Weatherunderground input that uses temp , humidity and wind etc to decide on watering percentage is the best they have.




xrapidx:
Looks like I've already been saved from blowing things up...

My 4th Valve has started randomly tripping the power - so this has become a priority... you can see how the valves are wired behind the relay  :facepalm:


Some general questions from my side
1.) Where would I be able to get a 24v transformer? I don't want to take the one from the Hunter unit if it requires disassembling (I'd prefer to sell it). I currently have a "bare" power cable coming in from the house, so it should be easy enough to connect something to it.

2.) Where can I get the single cable with multiple strands for the valves? (not sure what the cable is called)

I need to try and make sure I have everything upfront - my garden dies in a day or two without water, once I start, I don't want to get stuck.







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