Code and SchematicFeature This module is mainly controlled by ESP8266 01 ESP 01S and DHT11 is a temperature and humidity sensor The temperature and humidity in the ESP8266 acquisition environment are uploaded to the server Support 3 7v 12V DC power supply 3 7V lithium battery Can be used as a temperature and humidity collection node for smart home or IOT projects Characteristic Master ESP 01 ESP 01S This module does not include ESP 01 ESP 01S Temperature and humidity sensor DHT11Working voltage DC 3 7V 12V supports 3 7v lithium battery power supply Measuring range 20 90 RH 0 50 CMeasurement accuracy Temperature 2C Humidity5 RH Application example 1 Power supply 3 7V 12V DC power supply is connected to VCC GND 2 54mm pin header 2 Download the program to ESP 01S package does not includes this wireless module 3 Plug the ESP 01 ESP 01S package does not includes this wireless module into the 2 4 Pin female in the direction of the arrow Package includes 1 x WiFi Node Module