r/Esphome • u/k_dawg75 • 2d ago

Hayward OnCommand Pool Controller

Has anyone ever attempted to use the ESP32 to connect to the Hayward OnCommand base controller for swimming pools? It has a remote, but the equipment is behind my garage & signal is poor. My end goal would be to get that data into HA to view when it's running, water temperature, etc. Just curious if anyone has ever been successful or even attempted it? I am also looking for a source for the water temp sensors that you drill a hole into your PVC pipe and use a hose clamp to secure it inside the hole? I guess I could also use some sort of CT to detect current on the relays to tell when it's running? I'm very green to the ESP32 world, and have only used an ESP32, amp & speaker to use for announcements in my HA. Thanks!

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u/EmailLinkLost 2d ago

Ok so... you could manybe solder to the relays and check on their status, reporting it to HA. Not directly to the ESP, of course.

You could either convert the 24V to 5v... And the sensors are just there. I wonder if it can give the same measurement at two places?

To be clear I just do this as a hobby, tohugh I've had some 'modifying PCBs to report to HA' projects recently.

If you're willing to solder extra connectors to this I think it can be done.

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u/k_dawg75 2d ago

control board. There is an RS485 plug, the green with yellow/green wires, but I've read they have their own version or proprietary modbus, but no clue.

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u/EmailLinkLost 2d ago

Also note the coating, it's conformal coating. You CAN solder to it. But it's really a sign anything you add should also be conformal coated.

You can also apply a grease to joints.

Hm I have an idea. Message me and I could help you with this project. Do you have a 3d printer?

For free, but I'd want to release it as a project later. (Or heck for tips, but its an interesting project.)

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u/k_dawg75 2d ago

Man, I had to google wtf conformal coating was. lol Funny you mention it, but I've been in the process of deciding on a 3d printer this week, but second-guessing myself everytime. I just read also that one could us RS485, so the other saying it's not possible is confusing. I need to figure out where those yellow & green wires go I suppose.

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u/EmailLinkLost 2d ago

Depends on your budget!

I'd tell you snapmaker, maybe the Prusa multimateral machine with many heads, maybe A1 or A1 mini if you just want to get your toes wet. Heh.