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Thank you a lot for your response. If I understand, with the USB alimentation there is a low frequency accuracy. I need to try with an external supply for a better accuracy. I'll try as soon as possible. Have you tried with the 2 sensors ? I'll tried with the 2 values but nothing changed, I can't ha...

Hi, I would like to know if it's possible to use the HC-SR04 with the DHT11 into same INO project. HC-SR04 works if I comment the two next lines : humidity = dht.readHumidity(); temperature = dht.readTemperature(); Same if I comment HC-SR04 and uncomment DHT11. I can't have the two at the sametime. ...