The ESP module can read a SHT1x (SHT10, SHT11, SHT15) temperature/Humidity sensor using it's custom protocol.
The SHT1x sensor needs to be connected to two selectable GPIO pins. These pins can be configured on the hardware tab.
Use the device tab on the ESP Easy webinterface and create a new task by editing one of the available tasks. Select "Temperature & Humidity - SHT1X" from the dropdown box.
Enter the IDX found in the Domoticz device page. Select the two GPIO pins that are connected to the module. That should be all.