[OpenTRV-interest] Frankenvalve brainstorming

[Damon Hart-Davis]

Note that if you have TRV bases in place (of the right sort) no draindown is needed to replace the top part; they simply screw on and off without getting you anywhere near the water…

Rgds

Damon


> On 9 Jan 2015, at 22:05, Nigel <EMAIL ADDRESS HIDDEN> wrote:
> 
> I don't know about you, but the basic hardware at under £10 is a bargain. 
> 
> The hardest part is going to be the fitting - doing every one of 30 odd radiators is going to make draining the system a good idea! Once fitted, software and outer hardware are a snap to fiddle with by comparison. 
> 
> I can 3D print a new case if need be at small cost. I can swap the 'motherboard' or whatever quite easily. I can update firmware with no issue. But I really don't want to swap the valve hardware ever again. 
> 
> Oh, while I think about it, any chance of a firmware update hardware switch of some form? Like press the button then you have 3 hours to push an update before it disables it forever - until you press the button again?
> 
> That would give you time enough and avoid getting hacked.
> 
> N
> 
> Sent from mobile
> 
> 
> -------- Original message --------
> From: Tim Small <EMAIL ADDRESS HIDDEN>
> Date:09/01/2015 19:42 (GMT+00:00)
> To: "Open, non-developer list for interested parties" <EMAIL ADDRESS HIDDEN>
> Cc:
> Subject: Re: [OpenTRV-interest] Frankenvalve brainstorming
> 
> On 09/01/15 17:13, Nigel wrote:
> > The other option, to re map a different valve, would kind of cease
> > this project, & would also mean being stuck with all their issues and
> > design flaws. Plus of they add DRM or something it could turn out bad.
> > Behind arrested for breaking the DMCA for your radiator valves would suck.
> 
> I'm really only considering this as a stop-gap until cheap OpenTRV
> hardware is available, and any design changes from the manufacturer will
> always cause problems when adapting 3rd party hardware (whether
> replacing their electronics or not).  No DMCA in the UK AFAIK (and the
> EU laws only prohibit circumvention for the purpose of copyright violation).
> 
> They could lock down the firmware using signing etc. but that's going to
> make their life more difficult...
> 
> Until you have cost-effective hardware available, you limit (seriously)
> your developer community.  Until you have a good sized developer
> community it makes it difficult to make cost-effective hardware. 
> Chicken-egg problem.
> 
> There are other solutions to it of course, but it's worth considering IMO.
> 
> Tim.
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