Hi
On my weatherstation I have installed an DHT22 humidity sensor. He works normally a well, but on longer time and after a number of very humidity days, the sensor will stay in a hi level (>90%)
To day I have changed the 3. Sensor
- the programmed data request is (reading) approx. every 7.5seconds (Arduino)
- voltage by the sensor is 4.98VDC
- on top over the sensor is a axial fan installed to grant a air flow
are there any ideas, what can be happened?
thank you for your assistance
Max
DHT22 humity
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- adafruit_support_bill
- Posts: 88093
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Re: DHT22 humity
That is a common problem with capacitive humidity sensors. If the sensor becomes saturated, it can take a long time to dry out and resume normal readings.
Some of the more sophisticated sensors like the ones from Bosch have built-in heating elements to keep the sensing element above the dew-point.
Some of the more sophisticated sensors like the ones from Bosch have built-in heating elements to keep the sensing element above the dew-point.
- maxmueller50
- Posts: 2
- Joined: Fri Aug 27, 2021 7:02 am
Re: DHT22 humity
Thank you, this I thought the sameadafruit_support_bill wrote:That is a common problem with capacitive humidity sensors. If the sensor becomes saturated, it can take a long time to dry out and resume normal readings.
Some of the more sophisticated sensors like the ones from Bosch have built-in heating elements to keep the sensing element above the dew-point.
Forum rules
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