Modification of Hunter Enclosure with transformer for use with OSPi?

[Vendril]

Hi,

I read here somewhere that I can use the transformer from my almost broken Hunter system with my Pi. Can I get some information regards do’s do-not’s for how I should do this to not blow up stuff and for it to stay safe?

I think I will need to move stuff around/mod inside the enclosure to fit my OSPi (which just shipped!) as I don’t not think it will fit otherwise. I have attached a photo of the open box so you can hopefully advise on what you would do in this situation. The enclosure is for an eight station.

Thanks

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[Ray]

Generally you can reuse your existing 24VAC transformer. To double check, you can use a multimeter to measure the AC voltage (note: AC, not DC) of the output from the transformer. As long as it’s below 30VAC, it should be ok. Just plug in the output wires to the orange terminal block of OPSi, tighten the screws, and plug into OSPi board, and that should do it.

From your photo it’s hard to tell whether the space on the right would fit OSPi. It seems more feasible to leave the OSPi enclosure out, but even that it’s not clear to me whether it would fit. If you can measure the size of the empty space on the right I can tell you better.

[Vendril]

Hi Ray,

I put it all together and luckily the it fits fine and I dont need to move the transformer. My new question though is should I leave a few mm gap between the back of the Pi box and the transformer? Is there a big risk of the transformer damaging the electronics?

New picks included.

Thanks.

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[eggsally]

I just did this last week with a Pi Zero and put it in my RainDial (Irritrol) box. I didn’t even have to open the side of the box with the 24AC power supply, I just de-terminated the 24V wires from the old board and landed them on the OSPi board. Removing the old main board in this box was easy and the OSPi fit right in it’s place. I’ve got a micro wifi adapter on the PiZero and I couldn’t be happier with the performance of the whole package.

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[Ray]

Thank you all for posting and sharing pictures. To Vendril’s question: no , you don’t need to leave additional gap between OSPi and transformer. The acrylic case itself is an insulator.

[Vendril]

Thanks all for your help.

[Author]

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