Author Topic: Opensprinkler boards Round 2 Q & A  (Read 21954 times)

Offline johanhp

Re: Opensprinkler boards Round 2 Q & A
« Reply #15 on: November 09, 2016, 10:48:55 PM »
My RPi B ver 1.0 is working fine. Did not have to many issues to get it up and running.

Online xrapidx

Re: Opensprinkler boards Round 2 Q & A
« Reply #16 on: November 21, 2016, 11:14:20 AM »
Which Pi is required for this? I see the one(s) I have doesn't fit...

Offline tangmonster

Re: Opensprinkler boards Round 2 Q & A
« Reply #17 on: November 21, 2016, 11:40:44 AM »
Which Pi is required for this? I see the one(s) I have doesn't fit...

Which one do you have?

All raspberry pi's should work as confirmed by johanp

the one with NO mounting holes will work but very hard to mount seeing as it doesn't have any mounting holes. Best way will be to use ribbon cable and put it in second enclosure.

then there is the rev B:

This will also work , but i did not make provision on the pcb for the moutning hole. You should be able to drill a hole in the pcb and use a standoff in the middle. Just double check if there arent any track underneath the board before drilling but it should be just fine. You will only be able to use 1 hole. In the below picture it is the one closest to the HDMI connector.




Online xrapidx

Re: Opensprinkler boards Round 2 Q & A
« Reply #18 on: November 21, 2016, 11:46:32 AM »
That's the one I have, as pictured.

I don't mind ordering another one, but just want to make sure I order the right one for easiest "plug and play".

Offline tangmonster

Re: Opensprinkler boards Round 2 Q & A
« Reply #19 on: November 21, 2016, 11:50:21 AM »
One hole drilled in the board you should be able to use your rev B.

Personally I use a A+ with usb wifi plugin:

https://www.pishop.co.za/store/raspberry-pi-boards/raspberry-pi-model-a

Raspberry pi's however have  2.9mm mounting holes.

It is hard to screw in the m3 screws.

Personally I used a 3mm drill bit and reamed the mounting holes in the raspberry pi by hand.Might be easy enough to screw m3 screw without reaming.


Online xrapidx

Re: Opensprinkler boards Round 2 Q & A
« Reply #20 on: November 21, 2016, 11:53:03 AM »
Thanks, the pin layout in the B also looks different... (less) - haven't spent too much time with it, just noticed yesterday.

Offline tangmonster

Re: Opensprinkler boards Round 2 Q & A
« Reply #21 on: November 21, 2016, 12:09:28 PM »
Thanks, the pin layout in the B also looks different... (less) - haven't spent too much time with it, just noticed yesterday.


yes, but only use a few of the first lot of pins. no issues with pcb

i even opted to only populate a 2 x 10 way connector instead of full length.

Online xrapidx

Re: Opensprinkler boards Round 2 Q & A
« Reply #22 on: January 13, 2017, 08:53:13 AM »
24V ac transformer ( 20VA normally , 30VA advised for pi3):

ACDC R219 according to their website:
T-20VA 230/24
http://www.acdc.co.za/getPage.php?page=77

Yebo: R265
http://www.fort777.co.za/index.php?main_page=product_info&cPath=269_456_676_678_1150&products_id=3752


RS: R236 (short out two middel terminalks for 24Vac
http://za.rs-online.com/web/p/chassis-mounting-transformers/0504280/



For Cabling I used Cat 5 , cheap and easy. Running underground inside black pipe.

About to go shopping - I'm using a Pi3 - so 30Vac? (just want to make sure I don't blow the board somehow)

Offline tangmonster

Re: Opensprinkler boards Round 2 Q & A
« Reply #23 on: January 13, 2017, 08:58:23 AM »
no use 24Vac , don't go higher voltage

The suggested transformer itself must be 30VA , but that depends on how many relays and solinoids you are going to power at the same time.

The Yebo one at 24VA will probably be ok.


the VA and V ac might be getting a bit confusing.

You want to make sure to get a transformer that supplies 24Volt AC. At around 1 amp or more fro the transformer to last.



« Last Edit: January 13, 2017, 09:00:39 AM by tangmonster »

Online xrapidx

Re: Opensprinkler boards Round 2 Q & A
« Reply #24 on: January 13, 2017, 09:00:52 AM »
no use 24Vac , don't go higher voltage

The suggested transformer itself must be 30VA , but that depends on how many relays and solinoids you are going to power at the same time.

The Yebo one at 24VA will probably be ok.

Good thing I asked then.

Probably won't be more than three at a time. (e.g. pump, single garden zone, and maybe lights if its at night)

Online xrapidx

Re: Opensprinkler boards Round 2 Q & A
« Reply #25 on: January 13, 2017, 09:02:48 AM »
Just checked the Zest one - is the output current of 1A enough ?

Offline tangmonster

Re: Opensprinkler boards Round 2 Q & A
« Reply #26 on: January 13, 2017, 09:05:18 AM »
Good thing I asked then.

Probably won't be more than three at a time. (e.g. pump, single garden zone, and maybe lights if its at night)

it looks like yebo has no stock.

Give ACDC a ring in paarden eiland for their 30VA.

I would spend the extra R50 and get their 30VA:

T-30VA 230/24   1 PH TRANSFORMER 230:24V      R277.00


They have 9 in stock according to their website in cape town.

Crude calculations with headroom:

1 amp 24V rating should be just fine. the sprinkler solinoids draw around 200mA each.

a single Ac relay  will be less than 100mA , but lets make it 100mA for headroom/

So with 2 relays ( light / wellpoint pump)  and a solinoid you have 400mA = 9.6W ( crude 0.4 x 24V)

raspberry pi 3 is rounded up with headroom wifi enabled  500mA on 5V so that is 2.5W. (enough headroom to take into account for the regulator effeciency)

2.5W +   9.6W = 12.1 Watt.

you will most probably be fine with 20VA... But you are driving around and getting parts so go for the 30VA at acdc




« Last Edit: January 13, 2017, 09:14:38 AM by tangmonster »

Online xrapidx

Re: Opensprinkler boards Round 2 Q & A
« Reply #27 on: January 13, 2017, 09:06:56 AM »
Thanks - heading to Paarden Eiland today anyway for various odds and ends.

Offline tangmonster

Re: Opensprinkler boards Round 2 Q & A
« Reply #28 on: January 24, 2017, 10:52:38 AM »
Did you come right with the transformer? Any pics of install?

Online xrapidx

Re: Opensprinkler boards Round 2 Q & A
« Reply #29 on: January 24, 2017, 11:06:29 AM »
Did you come right with the transformer? Any pics of install?

Yes - thanks - I think I have everything now, hoping to attempt to install this coming Friday.  (I only get Fridays and weekends for this sort of thing - and I was away this past weekend).

I realized the actual install might be pretty easy as most of the wiring is already done for the existing Hunter system - it should just be a case of removing the hunter system, and replacing with this, as I believe the configuration is the same.

The Hunter system has all the wiring in a conduit for 220v - then the relay and valves. Meaning I wouldn't have to change anything, or run new wiring.