Graham
That's weird. The dew point should approach the ambient temp as humidity approaches 100%. I'll check with mine.
What was the ambient temperature?
Chris
Edit: I just realised you are using the Jaycar one. I don't think its very good - I wouldn't trust the way they measure temperature with resistors, plus it uses the DHT11 versus the DHT22 in mine and others
Quote:
Originally Posted by GRM
Hello All,
I took the Dew heater kit out last night and it seemed to work. IE: Heater strap connected correctly to the MOSFET, heating up. The thermistor and Ambient temperature reading correctly. However, the Ambience Humidity was reading 99% and Dew Point 42C. I suspect this is not right.
ChrisV, I used your code for the Dew Point. Thankyou.
However, I suspect the Dew Point reading of 42C is not right because of the high Ambient Humidity in the calculation.
Next steps. Calibrate the DHT11 as proposed by Garbz. I may also upgrade to a DHT22 and DS18B20s.
Thanks ChrisV, Garbz and Luka for the feedback.
Kind Regards
Graham Galea.
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