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This module to ESP8266-01 / ESP-01S as the master, DHT11 for the temperature and humidity sensor. ESP8266 collection environment temperature and cooling upload to the server. Support 3.7v-12V DC power supply (3.7V lithium battery). Can be used as a moisture and humidity collection node for intelligent home or IOT projects. Characteristic: * Master: ESP-01 / ESP-01S (this module does not include ESP-01 / ESP-01S) * Temperature and humidity sensor: DHT11 * Operating voltage: DC 3.7V-12V (support 3.7v lithium battery power supply) * Measuring range: 20-90% RH 0-50 ° C * Measurement accuracy: Temperature: ± 2 °Humidity ± 5% RH Application example: 1. Power supply: 3.7V-12V DC power supply connected to VCC GND (2.54mm pin) 2. Download the program to ESP-01S 3. Insert ESP-01 / ESP-01S into the 2 * 4 Pin 4. Temperature and humidity sent to another WiFi module, the serial display: as shown below: