I'm working on my second version a Fan Controller but when now ready to go I discovered that the 'heat' of the Arduino Nano 33 IoT does affect the humidity reading too much.
I didn't have that problem with v1.0 using an Arduino Nano 
Temp. inside the enclosure is 3.6 degr C higher.
I searched online for a possibility to lower the CPU frequency but that's not possible I think?
Also I could power the Arduino with 3v3 instead of 5V??
Any other suggestions are welcome!
The ability to connect to WIFI and Bluetooth both require a lot of power. Plus the controller runs very fast, as you noted. Both require more current and that produces more heat. No way to stop that.
However, you are measuring RELATIVE humidity, which varies with the temperature. Are you allowing for the various temperatures in your code?
Turn off the WiFi and put the sensors to sleep or use another Arduino board that doesn't have a lot of unused equipment onboard.
Powering by 3.3V may help too, as the linear voltage regulator converts the 1.7V from 5V into pure heat.
I'm surpriced it's only 3.6 C in that situation. Plastic is bad at transport heating away. A larger box, an eventual heat dissipating back plane might do better.
No I don't allow for temperature... The output from the sensor is in % RH so I don't need to at least that is what I presume...
Yes I will power the Arduino with 3v3 but wifi was the whole point of this build so...
But thanks to all that replied!
I decided to go for an external sensor as I cannot throttle the Arduino speed apparently.
Most RH sensors also include a temperature sensor. Check the data sheet for your sensor.
You are right, and for me that is an obvious fact. BTW: I only use non-chinese sensors form Bosch and Sensiron. That's why I presumed that the temp factor is included with the output of the sensors.
Thanks for taking the time to reply, very much appreciated!
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