NodeMCU
Connect Things EASY
An open-source firmware and development kit that helps you to prototype your IOT product within a few Lua script lines
Features
Open-source, Interactive, Programmable, Low cost, Simple, Smart, WI-FI enabled
Arduino-like hardware IO
Advanced API for hardware IO, which can dramatically reduce the redundant work for configuring and manipulating hardware. Code like arduino, but interactively in Lua script.
Nodejs style network API
Event-driven API for network applicaitons, which faciliates developers writing code running on a 5mm*5mm sized MCU in Nodejs style. Greatly speed up your IOT application developing process.
Lowest cost WI-FI
Less than $2 WI-FI MCU ESP8266 integrated and esay to prototyping development kit. We provide the best platform for IOT application development at the lowest cost.
Development Kit
The Development Kit based on ESP8266, integrates GPIO, PWM, IIC, 1-Wire and ADC all in one board. Power your developement in the fastest way combinating with NodeMCU Firmware!
USB-TTL included, plug&play
10 GPIO, every GPIO can be PWM, I2C, 1-wire
FCC CERTIFIED WI-FI module, PCB antenna
Examples
A few examples to play with

Connect to the wireless network

              
print(wifi.sta.getip())
--nil
wifi.setmode(wifi.STATION)
wifi.sta.config("SSID","password")
print(wifi.sta.getip())
--192.168.18.110
              
            

Arduino like IO access

              
pin = 1
gpio.mode(pin,gpio.OUTPUT)
gpio.write(pin,gpio.HIGH)
gpio.mode(pin,gpio.INPUT)
print(gpio.read(pin))

              
            

HTTP Client

              
-- A simple http client
conn=net.createConnection(net.TCP, false) 
conn:on("receive", function(conn, pl) print(pl) end)
conn:connect(80,"121.41.33.127")
conn:send("GET / HTTP/1.1\r\nHost: www.nodemcu.com\r\n"
    .."Connection: keep-alive\r\nAccept: */*\r\n\r\n")

              
            

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("<h1> Hello, NodeMCU.</h1>")
    end) 
end)
              
            

PWM

              
function led(r,g,b) 
    pwm.setduty(1,r) 
    pwm.setduty(2,g) 
    pwm.setduty(3,b) 
end
pwm.setup(1,500,512) 
pwm.setup(2,500,512) 
pwm.setup(3,500,512)
pwm.start(1) 
pwm.start(2) 
pwm.start(3)
led(512,0,0) -- red
led(0,0,512) -- blue
              
            

Blinking Led

              

lighton=0
tmr.alarm(0,1000,1,function()
if lighton==0 then 
    lighton=1 
    led(512,512,512) 
    -- 512/1024, 50% duty cycle
else 
    lighton=0 
    led(0,0,0) 
end 
end)

              
            

Bootstrap

              
--init.lua will be excuted
file.open("init.lua","w")
file.writeline([[print("Hello World!")]])
file.close()
node.restart()  -- this will restart the module.
              
            

Use timer to repeat

              
tmr.alarm(1,5000,1,function() print("alarm 1") end)
tmr.alarm(0,1000,1,function() print("alarm 0") end)
tmr.alarm(2,2000,1,function() print("alarm 2") end)
-- after sometime
tmr.stop(0)
              
            

A pure lua telnet server

              
-- a simple telnet server
s=net.createServer(net.TCP,180) 
s:listen(2323,function(c) 
    function s_output(str) 
      if(c~=nil) 
        then c:send(str) 
      end 
    end 
    node.output(s_output, 0)   
    -- re-direct output to function s_ouput.
    c:on("receive",function(c,l) 
      node.input(l)           
      --like pcall(loadstring(l)), support multiple separate lines
    end) 
    c:on("disconnection",function(c) 
      node.output(nil)        
      --unregist redirect output function, output goes to serial
    end) 
    print("Welcome to NodeMCU world.")
end)

              
            

Interfacing with sensor

              
-- read temperature with DS18B20
t=require("ds18b20")
t.setup(9)
addrs=t.addrs()
-- Total DS18B20 numbers, assume it is 2
print(table.getn(addrs))
-- The first DS18B20
print(t.read(addrs[1],t.C))
print(t.read(addrs[1],t.F))
print(t.read(addrs[1],t.K))
-- The second DS18B20
print(t.read(addrs[2],t.C))
print(t.read(addrs[2],t.F))
print(t.read(addrs[2],t.K))
-- Just read
print(t.read())
-- Just read as centigrade
print(t.read(nil,t.C))
-- Don't forget to release it after use
t = nil
ds18b20 = nil
package.loaded["ds18b20"]=nil
              
            
Contact us