NodeMcu

###A lua based firmware for wifi-soc esp8266 version 0.9.2 build 2014-12-02

Change log

2014-12-02
fix the heap recover too slow issue, heap will recover in seconds, not minutes.
modify the return of file.open, return nil if file not exist, true if opend ok.
move startup version display before doing the init.lua.
modify wifi.ap.config(), remove the restart at the end of config.

more change log
更多变更日志

Summary

• Easy to access wireless router
• Based on Lua 5.1.4
• Event-Drive programming preferred.
• Build-in file, timer, pwm, i2c, net, gpio, wifi, adc, uart and system api.
• GPIO pin re-mapped, use the index to access gpio, i2c, pwm.
• GPIO Map Table:

IO index	ESP8266 pin	IO index	ESP8266 pin
0	GPIO12	8	GPIO0
1	GPIO13	9	GPIO2
2	GPIO14	10	GPIO4
3	GPIO15	11	GPIO5
4	GPIO3
5	GPIO1
6	GPIO9
7	GPIO10

#Flash the firmware nodemcu_512k.bin: 0x00000
for most esp8266 modules, just pull GPIO0 down and restart.

#Connect the hardware in serial braudrate:9600

#Start play

####Connect to your ap

    print(wifi.sta.getip())
    --0.0.0.0
    wifi.setmode(wifi.STATION)
    wifi.sta.config("SSID","password")
    print(wifi.sta.getip())
    --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/1.1\r\nHost: www.baidu.com\r\n"
        .."Connection: keep-alive\r\nAccept: */*\r\n\r\n")

####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("<h1> Hello, NodeMcu.</h1>")
      end) 
      conn:on("sent",function(conn) conn:close() end)
    end)

####Do something shining

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

####And blink it

  lighton=0
  tmr.alarm(1000,1,function()
    if lighton==0 then 
      lighton=1 
      led(512,512,512) 
    else 
      lighton=0 
      led(0,0,0) 
    end 
  end)

####If you want to run something when system started

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

####With below code, you can telnet to your esp8266 now

    -- 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)           -- works like pcall(loadstring(l)) but support multiple separate line
       end) 
       c:on("disconnection",function(c) 
          node.output(nil)        -- un-regist the redirect output function, output goes to serial
       end) 
       print("Welcome to NodeMcu world.")
    end)

#Check this out Tencent QQ group: 309957875
nodemcu wiki
nodemcu.com