Quote:
Originally Posted by ChrisV
Hi Daniel. Should be simple enough. How is the fan cooler supposed to be controlled?
- does it just turn on for a certain amount of time or
- oes it sense the mirror temp and turn the fan on until the mirror drops to within a few degrees of ambient?
Let me know.
One other thing. Don't get the components for a week or two as I'm making some changes - different ambient temp/humidity sensor, and big changes to the code. I'll have it all up on GitHub soon.
Chris
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Actually, I have choosen a different kind of DHT sensor, the AM2301, mainly because the enclosure, and some tests show it is on pair with dht22 in accuracy.
Regarding the fan, it should be set probably something like this;
Temp diff > 3 degrees C - 100% fan (Both under or over primary mirror temp)
Temp diff between 2-3 degrees C - 75% fan
Temp diff between 1-2 degrees C - 50% fan
Temp diff between 0-1 degrees C - 0% fan
I am thinking taking the differential temperature measurements from the ambient DHT- sensor and the DS18B20 attached to the primary mirror.
It should be doable uding the 4th channel of the IR540 board i presume?
Regards, Daniel.