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The observatory I help run is 150km up the road. The roof control system is fairly robust but I don’t mind adding redundancy.
We have a staircase timer on the roof control motor. If it doesn’t receive a signal from the software every 60 seconds, the timer will expire and the roof will automatically close. The optical rain sensor would break that circuit (by opening a normally closed relay) and close the roof in the event of say bad data coming from the weather sensor and the software not knowing it was raining.
DT
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