Description:
NodeMCU is an open source IoT platform.It uses the Lua scripting language. It is based on the eLua project, and built on the ESP8266 SDK 0.9.5. It uses many open source projects, such as lua-cjson,and spiffs. It includes firmware which runs on the ESP8266 Wi-Fi SoC, and hardwarewhich is based on the ESP-12 module.

Description:
NodeMCU is an open source IoT platform.It uses the Lua scripting language. It is based on the eLua project, and built on the ESP8266 SDK 0.9.5. It uses many open source projects, such as lua-cjson,and spiffs. It includes firmware which runs on the ESP8266 Wi-Fi SoC, and hardwarewhich is based on the ESP-12 module.

It is the 5th design of NodeMCU devkit. It uses CP2102 as UART bridge, and can flash firmware automatically by using nodemcu-flasher. It support apple's MAC OS.

Easy to access wireless router
Based on Lua 5.1.4 (without debug, os module.)
Event-Drive programming preferred.
Build-in json, file, timer, pwm, i2c, spi, 1-wire, net, mqtt, coap, gpio, wifi, adc, uart and system api.
GPIO pin re-mapped, use the index to access gpio, i2c, pwm.
Both Integer(less memory usage) and Float version firmware provided.
Dependencies

Build on ESP8266 sdk 0.9.5
Lua core based on eLua project
cjson based on lua-cjson
File system based on spiffs
Flash the firmware

nodemcu_latest.bin: 0x00000
for most esp8266 modules, just pull GPIO0 down and restart.
You can use the nodemcu-flasher to burn the firmware.

Or, if you build your own bin from source code.
0x00000.bin: 0x00000
0x10000.bin: 0x10000

Better run file.format() after flash

Connect the hardware in serial

baudrate:9600

Start play

Connect to your ap

ip = wifi.sta.getip()
print(ip)
-- nil
wifi.setmode(wifi.STATION)
wifi.sta.config("SSID","password")
ip = wifi.sta.getip()
print(ip)
-- 192.168.18.110
Manipulate hardware like a arduino

pin = 1
gpio.mode(pin,gpio.OUTPUT)
gpio.write(pin,gpio.HIGH)
print(gpio.read(pin))
Write network application in nodejs style

-- A simple http client
conn=net.createConnection(net.TCP, 0)
conn:on("receive", function(conn, payload) print(payload) end )
conn:connect(80,"115.239.210.27")
conn:send("GET / HTTP/1.1rnHost: www.baidu.comrn"
    .."Connection: keep-alivernAccept: */*rnrn")
Or a simple http server

-- A simple http server
srv=net.createServer(net.TCP)
srv:listen(80,function(conn)
  conn:on("receive",function(conn,payload)
    print(payload)
    conn:send("

Hello, NodeMcu.

")
  end)
  conn:on("sent",function(conn) conn:close() end)
end)
Connect to MQTT Broker

-- init mqtt client with keepalive timer 120sec
m = mqtt.Client("clientid", 120, "user", "password")
-- setup Last Will and Testament (optional)
-- Broker will publish a message with qos = 0, retain = 0, data = "offline"
-- to topic "/lwt" if client don't send keepalive packet
m:lwt("/lwt", "offline", 0, 0)
m:on("connect", function(con) print ("connected") end)
m:on("offline", function(con) print ("offline") end)
-- on publish message receive event
m:on("message", function(conn, topic, data)
  print(topic .. ":" )
  if data ~= nil then
    print(data)
  end
end)
-- for secure: m:connect("192.168.11.118", 1880, 1)
m:connect("192.168.11.118", 1880, 0, function(conn) print("connected") end)
-- subscribe topic with qos = 0
m:subscribe("/topic",0, function(conn) print("subscribe success") end)
-- or subscribe multiple topic (topic/0, qos = 0; topic/1, qos = 1; topic2 , qos = 2)
-- m:subscribe({["topic/0"]=0,["topic/1"]=1,topic2=2}, function(conn) print("subscribe success") end)
-- publish a message with data = hello, QoS = 0, retain = 0
m:publish("/topic","hello",0,0, function(conn) print("sent") end)
m:close();
-- you can call m:connect again
UDP client and server

-- a udp server
s=net.createServer(net.UDP)
s:on("receive",function(s,c) print(c) end)
s:listen(5683)
-- a udp client
cu=net.createConnection(net.UDP)
cu:on("receive",function(cu,c) print(c) end)
cu:connect(5683,"192.168.18.101")
cu:send("hello")

Package Included:
1 X NodeMCU Devkit 2.0