..the tests continue now it's winter..
So far sadly not too good. The tests I did initially were using plastic bags to restrict the airflow and then I was getting good results. Now I've had a few (not many) real scenarios and disappointingly the results didn't match the tests.
I'm continuing to monitor but as we have few days cold enough to cause frosting progress is slow.
I'm going to investigate another approach in parallel; monitoring humidity (from one of the sensors) as well as temperature. As the humidity hugely influences frost then this may be a more reliable method and it may be possible to calculate probability based on humidity/exterior and evaporator temperatures.
If this still doesn't produce the required results then there is always the IR emitter/detector method but I'm going to see how I get on with the humidity one first.
Acuario
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