[OpenTRV-dev] Hatching product plans in my head for this coming winter...

[Damon Hart-Davis]

No wires other than the two to control the boiler.

Rgds

Damon


On 21 Mar 2014, at 19:30, Bo Herrmannsen <EMAIL ADDRESS HIDDEN> wrote:

> hmm..
> 
> so, we have a box on the wall with 230V in and wires out for the valve?
> 
> and we want to put our stuff in direct replacement?
> 
> 
> Den 21/03/2014 kl. 15.46 skrev Damon Hart-Davis:
> 
>> Given observations in a few houses now I just create the following JIRA story:
>> 
>> 	• TODO-211
>> Make hub box direct physical replacement for 2-wire 230V mech thermostat
>> 
>> 
>> 
>> Build a box which will serve as a physical replacement for standard wall thermostat.
>> 
>> Assume no power socket likely to hand (often in a hall for example), so will ideally be parasitically powered from the sense voltage.
>> 
>> Probably little or no UI (maybe just the LED). Also, as may be floating at mains voltage extra care would be needed for any buttons etc.
>> 
>> 
>> So the parasitic power shouldn’t be too hard (I’ve done something like it in the past) and it only needs ~100mW to keep a radio receiver running.
>> 
>> If we do have any UI on the hub, and it isn’t managing a local valve, maybe it could be modified to handle house-wide party/holiday mode buttons.
>> 
>> Also, conceivably, this could be knitted into dynamic demand type stuff to help the grid by turning off the boiler for a short while when the grid’s having a bad moment.
>> 
>> Rgds
>> 
>> Damon
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