very messy and needs a lot of sorting out….but it does work on our functioning system. manages delta t and also secondary heating if needed.
click the link to download…
code so far
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DIY solar hot water controllerthe solar hot water system you can see on this blog has cost approximately £200 all in. In particular the flat plate collector was made out of mostly recycled materials! Here in the UK people regularly pay anywhere in the region of £6000 - £8000 for a system which we regard as inferior. And what's more it has a horrific amout of embodied carbon due to shipping from China. So have a go yourself and we hope this blog will assist you in your system design and construction.. below you'll find the blog area which we're updating constantly with new info regarding the controller...coming soon...a dedicated PCB!!! approved Propeller controller PCB port assignment table 
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