naladka:
Looks like sensor resetting procedure helps me. I think it happens when sensor is used in extreme conditions like when breathing on it or placing straight under vapor stream or ultrasonic humidifier.all you need to do:
Step one: Keep the DHT sensor at the condition of Temperature 50~60Celsius, humidity <10%RH for 2 hours;
Step two:K keep the DHT sensor at the condition of Temperature 20~30Celsius, humidity >70%RH for 5 hours.In my case it wasn't hard to get that environment: first one can be achieved just placing sensor in air heater (water or electric), second- just cover sensor with something wet in room temperature. After resetting i have checked measurements and surprisingly humidity was both equal on DHT11 and expensive, calibrated hygrometer.
Sorry, I realize this is an old thread.
How do you keep a DHTxx sensor at 50-60°C and 10% humidity? My oven has a low setting of 200°F (≈93°C), which is well that range.
I built a thermostatically controlled warm air heater that I could turn way, waaaay up (it's set to put out air at about 38°C to dry my bike gear/ski gear after use) but the thermostat is a rather touchy bimetal thermostat and getting it readjusted for normal use would take some time.