Data Sheet

tmr.stop(1)

print("Connected!")

print("Client IP Address:",wifi.sta.getip())

cl=net.createConnection(net.TCP, 0)

cl:connect(80,"192.168.4.1")

tmr.alarm(2, 5000, 1, function()

if(wifi.sta.getip()==nil) then

wifi.sta.disconnect()

wifi.sta.config("test","12345678") -- connecting to server

wifi.sta.connect()

print("Looking for a connection")

tmr.start(1)

end

cl:send("Hello World!")

cl:send(i)

i=i+1

end)

else

print("Connecting...")

end

end)

We can according the print information display in the Lualoader debug window to judge the

two NodeMCU Whether have established a connection. If the “AP mode ” NodeMCU receive a

“Hello World!” from the “STA mode” NodeMCU that means the communication establish

successful.

Lesson18: DHT11 Temperature Display System

In this lesson you will know how to use the DHT11 temperature sensor, and display it on the

OLED, It is easy to make us always know the current temperature. And we will use two ESP8266

NodeMCU for the sake of knowing the temperature of the DHT11 that placed anywhere.

Material:

Crowtail- ESP8266 NodeMCU x 2

Crowtail- OLED x 1

Crowtail- Temperature & humidity Sensor x 1

Hardware Connection