Opentherm Gateway

This Forum is about the Opentherm gateway (OTGW) from Schelte

Moderator: hvxl

wwolkers
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Re: Opentherm Gateway

Post by 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

Re: Opentherm Gateway

Post by vanisher »

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

Post by Digit »

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

Post by FoRMaTC »

I ordered a batch of 10, lets see how long it takes
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Re: Opentherm Gateway

Post by 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.
Schelte
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Re: Opentherm Gateway

Post by 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

Re: Opentherm Gateway

Post by vanisher »

Digit wrote:Vanisher, don't worry. I have a Calenta and it works just fine.
Great!!
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Re: Opentherm Gateway

Post by sj3fk3 »

FoRMaTC wrote:I ordered a batch of 10, lets see how long it takes
Cool! Count me in as well!
Kind Regards,
Greg.
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Re: Opentherm Gateway

Post by FoRMaTC »

hvxl wrote: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 ;)
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Re: Opentherm Gateway

Post by mo046 »

FoRMaTC wrote:I ordered a batch of 10, lets see how long it takes
Count me in as well!
** Maurice **
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Re: Opentherm Gateway

Post by esschenk »

Count me in as well!

Ed
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Re: Opentherm Gateway

Post by 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?
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Re: Opentherm Gateway

Post by fabian »

WooTz wrote: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.
FoRMaTC wrote:
Volgens mij ken ik jou ;)
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Re: Opentherm Gateway

Post by hvxl »

fabian wrote: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.
WooTz wrote: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.
Schelte
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Re: Opentherm Gateway

Post by FoRMaTC »

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