Feature 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 ESP8266 ESP 01S 1MB 8Mbit Flash size AP STA AP STA modes available Very simple AT commands easy to use Low power consumption and smallInternal LWIP interface Only four pins interface VCC 3V3 GND TXD and RXD AT commands firmware New IC ESP8266exThis module just have small upgradation on ESP 01 PCB boardCharacteristic 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 Module1 x ESP 01S Wireless Module