In order to correctly reflect the humidity of the sht31 temperature & humidity sensor space to be measured, it is also necessary to avoid placing the sensor too close to the wall or in a dead corner where the air is not ventilated. If the room being tested is too large, multiple sensors should be placed. Some humidity sensors have relatively high requirements on the power supply, otherwise the measurement accuracy will be affected. Or the sensors interfere with each other or even fail to work.