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 cycleelse 
    lighton=0 
    led(0,0,0)endend)

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)endend 
    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 linesend) 
    c:on("disconnection",function(c) 
      node.output(nil)--unregist redirect output function, output goes to serialend) 
    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




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