Opentherm Gateway

[wwolkers]

There are more than enough people willing to buy them, I went through my batch of 10 in 2 days, and there are more requests open. You should have no problem getting them sold, as long as the price is fair.

[vanisher]

If it's working with the Remeha Calenta count me in also (if the price is right ofcourse).

[Digit]

Vanisher, don't worry. I have a Calenta and it works just fine.

[FoRMaTC]

I ordered a batch of 10, lets see how long it takes

[hvxl]

FoRMaTC, if you want I can already mention your name on the web site so people can contact you. That way you may have sold all boards already by the time they arrive.

[yjb]

Just wondering; I've got a Remeha Quinta connected to a Celcia-20. If that setup is supported I'm interested in a PCB as well.

[vanisher]

Vanisher, don't worry. I have a Calenta and it works just fine.

Great!!

[sj3fk3]

I ordered a batch of 10, lets see how long it takes

Cool! Count me in as well!

[FoRMaTC]

FoRMaTC, if you want I can already mention your name on the web site so people can contact you. That way you may have sold all boards already by the time they arrive.

I think you already did

[mo046]

I ordered a batch of 10, lets see how long it takes

Count me in as well!

[esschenk]

Count me in as well!

Ed

[WooTz]

stupid question maybe, but im checking your schematic, I see a 24VDC supply, however the trafo is only 15 VAC? Any plans on releasing an Ethernet version?

[fabian]

stupid question maybe, but im checking your schematic, I see a 24VDC supply, however the trafo is only 15 VAC?

I'f i'm not mistaken, adding a diode bridge as rectifier to a 15V AC powersupply creates a DC voltage of carrot(2) * 15V - ~ 0,6 (per diode) ~= 20V DC with a small ripple which can be filterd out with capacitor C1.
I've even meassured 27V on X1. It drops after connecting a load.

http://tclcode.com/opentherm/debugging.html#power has detailed information on the voltages which can be expected.

Volgens mij ken ik jou

[hvxl]

I'f i'm not mistaken, adding a diode bridge as rectifier to a 15V AC powersupply creates a DC voltage of carrot(2) * 15V - ~ 0,6 (per diode) ~= 20V DC with a small ripple which can be filterd out with capacitor C1.

In addition, the voltage listed for transformers is the voltage they are able to produce while drawing the maximum current. The opentherm gateway circuitry doesn't use much power. As a result the actual voltage out of the transformer is higher than 15V, probably closer to 18V. In my first prototype I used an 18V AC transformer and ended up with a DC voltage close to 30V. That's why I chose a 15V transformer this time, which brought the DC voltage much closer to my target of 24V. But the value is not very critical, a DC voltage anywhere between 20V and 35V will work.

Any plans on releasing an Ethernet version?

Not by me. But I've had inquiries by someone who was considering doing that. I don't know if he's planning to publish his modifications, though.

[FoRMaTC]

I will have a look tomorrow and check with my collegues to make it somehow wireless/ethernet