Now a days measuring temperature and humidity is not a difficult job. Because lot of sensor are available in the market. DHT11 and DHT22 are very familiar from others. DHT11 Module is very low cast and available in market long days. In this tutorial you will learn how to  interface DHT11 with ESP8266 module using NodeMCU Firmware. In this project I’m used  Espressif’s ESP8266X of Ai-thinger’s ESP-12F module with  Aosong DHT11 module using NodeMCU DHT Module in windows system. You can also use any other ESP8266 Modules for this project.

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Required

• Required Hardware Components : ESP8266 Any Module( Used Ai-Thingers ESP-12F) – 1Nos, DHT11 Temperature and Humidity Sensor (eBay) – 1Nos, 4R7 Kilo Ohm Resistor-0.25W (eBay) – 1Nos, ESP8266 Programmer (FDTI chip or use your Arduino board) – 1Nos, Wires
• Required Software and Tools :  NodeMCU Flasher , Any version of ESPlorer by 4refr0nt (Used v0.2.0-rc5), DHT11 Firmware (Build your custom firmware),

• Save the code name as “AEW_DHT11.lua” in your system
• Flash DHT11 NodeMCU Firmware to ESP8266 Module using NodeMCU firmware flasher, Follow below connection details

• Connect ESP8266 Module GPIO-5 pin to DHT11 Data pin with 4.7K ohm pull-up resistor

• Upload the above lua code to esp module using ESPlorer(Use baud rate 115000), follow above connection details
• Do-file (AEW_DHT11.lua)

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Circuit Diagram

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Code

pin = 23
status, temp, humi = dht.read11(pin)
if status == dht.OK then
    print("DHT Temperature:"..temp..";".."Humidity:"..humi)

elseif status == dht.ERROR_CHECKSUM then
    print( "DHT Checksum error." )
elseif status == dht.ERROR_TIMEOUT then
    print( "DHT timed out." )
end

 

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Result

 

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