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Thread: My HGI80 equivalent Domoticz setup without HGI80

  1. #131
    Automated Home Guru
    Join Date
    Feb 2016
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    183

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    Yes, it is a bit pot-luck with the low-cost CC1101 devices. I was lucky with my first purchase which was a 2 device purchased directly via an Ebay seller in China and an 868MHz device turned up. I decided to purchase my last one from a UK seller which cost 12 as I wanted one with header pins and antenna with socket to help with further testing.

  2. #132
    Automated Home Jr Member
    Join Date
    Jan 2019
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    Well, I have an 868Mhz setup now (with irritating slightly-smaller header spacing that meant I had to alternate pins on each side of the board!). Unfortunately this board doesn't support the SMA connector and has its own little antenna, but the range seems to be much improved and I'm reliably getting messages from all over the house.

    My questions now:

    • Is there any way to "inject" commands safely? I'm using evohome-Listener to connect to OpenHAB via MQTT. I've always wanted some form of local control, but equally don't want to end up writing my own software to replace the whole controller!
    • How does heat demand work? I have two BDR91s - CH and DHW with no direct boiler control (boiler is fired from the valve microswitches). I frequently see messages suggesting the relay heat demand is 56%, but the actuator is off so the boiler isn't firing. Is the CH relay doing some (very slow) PWM or similar? This even seems to happen if I tell the controller there's an OpenTherm relay (without anything bound) - I just start to get boiler demand messages in the same way - but the actuator turning on and off seems to be independent.


    Edit: done a bit of reading and it sounds like this is expected behaviour - TPI at 6 cycles/min with no minimum on-time in the case of my two-relay system. I'm hoping it behaves slightly differently when it thinks there's an OpenTherm boiler connected as the water temperature will vary (which is what I'm expecting to do with my reset-sensor hack)
    Last edited by thigger; 10th February 2019 at 12:36 PM. Reason: heat demand info

  3. #133
    Automated Home Ninja
    Join Date
    Aug 2016
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    469

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    Yes, the heat demand (and config params) are sent to the BDR, and it takes care of turning itself on and off according to the required demand.

    You can inject commands, yes. I'm not sure which firmware you're running. If it's mine (or a derivative), this *used* to work. I've not tried it for a long time though, but I see no reason why it shouldn't. Domoticz uses this feature to be able to update the controller mode (away, day off, etc.), the setpoints, etc.

  4. #134
    Automated Home Guru
    Join Date
    Feb 2016
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    183

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    Is there any way to "inject" commands safely? I'm using evohome-Listener to connect to OpenHAB via MQTT. I've always wanted some form of local control, but equally don't want to end up writing my own software to replace the whole controller!
    I play around a lot with injecting commands into my Evohome systems via Domoticz and also directly as part of my of my ongoing work on the Domoticz code, fixing bugs and adding additional functionality. The only time I've ever been able to temporarily mess up my system is during some testing of experimental schedule upload/download functionality which caused the controller to lock-up. This was fixed simply by removing the batteries and it restarted with no problems or loss of information, so I'm pretty confident that you won't mess things up by injecting commands. Unfortunately though, I don't have any simple suggestions for how to directly inject your own messages. I sometimes just send an appropriately structured message via a serial port client e.g. PuTTY etc, but there is very little publicly available information on the message structure etc. so it's pretty much trial and error.

    Dan

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