[120] opentherm gateway

For OpenTherm-gateway related questions in Domoticz
CaptainSlow
Posts: 27
Joined: Thursday 08 December 2016 22:07
Target OS: Raspberry Pi
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Re: [120] opentherm gateway

Postby CaptainSlow » Monday 09 January 2017 19:10

With the Remeha Tzerra and the Kiwi bought OTGW with esp8266 wifi to serial bridge the only value for that works without errors is VR=1. All the other values, especially the higher ones gave me all but error 03's....

rjblake
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Re: [120] opentherm gateway

Postby rjblake » Monday 09 January 2017 23:43

CaptainSlow wrote:With the Remeha Tzerra and the Kiwi bought OTGW with esp8266 wifi to serial bridge the only value for that works without errors is VR=1. All the other values, especially the higher ones gave me all but error 03's....


Did you use a higher rated transformer and change out the 7805 for the Recom DC/DC converter? If not, that may be the reason. The parts needed, with Conrad.nl part number are:

RECOM R-78E5.0-0.5 DC/DC-converter, print 24 V/DC 5 V/DC 500 mA (part 157954 - 89)
EI 30/15,5 printtransformator VB 2 VA Primair: Secundair: 2 VA VB 2,0/1/15 Block (part number 710564 - 89)

CaptainSlow
Posts: 27
Joined: Thursday 08 December 2016 22:07
Target OS: Raspberry Pi
Domoticz version: Beta
Location: Bussum
Contact:

Re: [120] opentherm gateway

Postby CaptainSlow » Tuesday 10 January 2017 6:45

rjblake wrote:
CaptainSlow wrote:With the Remeha Tzerra and the Kiwi bought OTGW with esp8266 wifi to serial bridge the only value for that works without errors is VR=1. All the other values, especially the higher ones gave me all but error 03's....


Did you use a higher rated transformer and change out the 7805 for the Recom DC/DC converter? If not, that may be the reason. The parts needed, with Conrad.nl part number are:

RECOM R-78E5.0-0.5 DC/DC-converter, print 24 V/DC 5 V/DC 500 mA (part 157954 - 89)
EI 30/15,5 printtransformator VB 2 VA Primair: Secundair: 2 VA VB 2,0/1/15 Block (part number 710564 - 89)


THX... 8-) 8-) ...I was thinking about that already and I read the posts about it. Thought I'd give it a try with the one that came with the package. The transformer is hottish but not bloody hot I would say. I might need to change it to the heavier one and swapping the 7805 to DC/DC converter.
I don't get error messages yet and the connection seems stable. Had 2 drops in 2 days something like that but in the end I probably need to change it anyway :D :D


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