WARNING
There are some changes coming in HA v0.115 to the way sensors work (link).
It is something you need to be aware of and in most cases any changes you need to make to your config look simple - but please check when the time comes 
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It does though, look like a lot of my sensors might need some non-trivial changes. I am not concerned by this apart from the fact that it is always a concern to make changes to something that works.
However, the timing is unfortunate as I have some other changes to this package waiting for ‘publication’. Some are cosmetic, some take advantage of other recent changes in HA to ‘improve’ and simplify the code. These changes have been tested but not exhaustively.
I plan to ‘publish’ the current changes very soon and would be grateful if you can test them in a live environment more extensively than I am currently able. It is no longer summer here so I can’t test using actual switches/valves.
I hop ether are no bugs but I’d rather iron them out now and be dealing with only one set of issues (if there are any) caused by the new v0.115.
Please be aware that you will not be able to upgrade to v0.115 until after I have made the new sensor based changes if you want to continue using this package.