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Hts221 how long does the heater have to be ON to clear condensation
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Eleon BORLINIBest answer
ST Employee
Sep 29, 2020 9:30 AM UTC
HI @RSoto.1 ,
the exact time of the condensation recovery would depend on the "condensation level" on the sensor.
Assuming the maximum condensation, I can share you an average characterization results:
- Example: Fridge. Max condensation to ambient 68%:
- without heater --> 800 seconds
- with heater on --> 10 seconds
Please note also that the amount of current flowing in the heater depends on the Vdd, and is proportional to the RH% reduction in a constant timeframe. For example, 1-minute heater ON at Vdd=3.3V drops the humidity of -23rH, while at Vdd=1.8V the drop is -8rH, same timeframe.
-Eleon