I put together Arduino nano and temperature/humidity sensor DHT11 using DHT11 library..
DHT11 humidity should work in range 20%-90% RH.
I am getting 27%RH at 21 Celsius -dry but ok.. but when i increase temperature to 40 degrees of Celsius i get result 4% RH ..
Sensor is in the sealed box with two ventilators..
...even if i put inside wet towel i still don't get more than 11% RH
do i have problem with sensor or with understanding the physics??