What is NodeMCU and how to code a Simple LUA Script

NodeMCU is an Open Source Firmware Development Board that helps you to build your IOT(Internet of Things) projects with a few LUA Script Lines, NodeMCU it is like Arduino Hardware with a Input Output built in the Board itself, it has also a Wifi built in to connect directly to internet to control your things online using Nodejs Style network API for digital network applications, which facilitates developers to code running on the Board, Greatly speed up your Internet of Things application development process.

The Development Board base on ESP8266 Chip, integrated GPIO(General Purpose Input Output), PWM(Pulse with Modulation),IIC(Interconnected Integrated Circuit), 1-Wire and ADC all in one board to power up your development board in fastest way combined with the NodeMCU Firmware.

Development Board Features:

OPEN SOURCE Development Board
USB to TTL built in “Plug & Play”
10x GPIO(General Purpose Input Output)
Built In Wireless Network(Wifi) to Communicate true out the Internet

Pin Out Diagram

Connecting to the wifi network

print(wifi.sta.getip())
--nil
wifi.setmode(wifi.STATION)
wifi.sta.config("SSID","password") -- COnfigure the wireless network (wifi)
print(wifi.sta.getip()) -- Get IP Adress
--192.168.18.110

print(wifi.sta.getip())

--nil

wifi.setmode(wifi.STATION)

wifi.sta.config("SSID","password") -- COnfigure the wireless network (wifi)

print(wifi.sta.getip()) -- Get IP Adress

--192.168.18.110

To Access (GPIO) / Input Out

pin = 1
gpio.mode(pin,gpio.OUTPUT) -- Pin 1 Configure to Output
gpio.write(pin,gpio.HIGH)  -- Pin 1 swithch swith it On
gpio.mode(pin,gpio.INPUT)  -- Pin 1 defines as Input
print(gpio.read(pin))       -- Pin 1 read the input Pin 1

pin = 1

gpio.mode(pin,gpio.OUTPUT) -- Pin 1 Configure to Output

gpio.write(pin,gpio.HIGH) -- Pin 1 swithch swith it On

gpio.mode(pin,gpio.INPUT) -- Pin 1 defines as Input

print(gpio.read(pin)) -- Pin 1 read the input Pin 1

Configure a http client

-- Configure as simple http client
conn=net.createConnection(net.TCP, false)  
conn:on("receive", function(conn, pl) print(pl) end) -- Recieve
conn:connect(80,"xxx.xx.xx.xxx") -- Public IP Adress of your router forwared to port 80
conn:send("GET / HTTP/1.1\r\nHost: www.14core.com\r\n"
    .."Connection: keep-alive\r\nAccept: */*\r\n\r\n")

-- Configure as simple http client

conn=net.createConnection(net.TCP, false)

conn:on("receive", function(conn, pl) print(pl) end) -- Recieve

conn:connect(80,"xxx.xx.xx.xxx") -- Public IP Adress of your router forwared to port 80

conn:send("GET / HTTP/1.1\r\nHost: www.14core.com\r\n"

.."Connection: keep-alive\r\nAccept: */*\r\n\r\n")

Configure a http server

 -- Configure a http server
srv=net.createServer(net.TCP)
srv:listen(80,function(conn)   -- Define Listening at Port 80 on your router
    conn:on("receive",function(conn,payload)
    print(payload)
    conn:send("<h1> Hello, 14core.com | Ideas Comes to Reality</h1>")
    end)
end)

-- Configure a http server

srv=net.createServer(net.TCP)

srv:listen(80,function(conn) -- Define Listening at Port 80 on your router

conn:on("receive",function(conn,payload)

print(payload)

conn:send("<h1> Hello, 14core.com | Ideas Comes to Reality</h1>")

end)

Sample Code for PWM(Pulse with Modulation)

-- Working on Pulse with Modulation
function led(r,g,b)  -- RGB LED
    pwm.setduty(1,r) -- Set working on 1 LED Red
    pwm.setduty(2,g) -- Set to work on 2 LED Green
    pwm.setduty(3,b) -- Set to work on 3 LED Blue
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) -- LED Red
led(0,0,512) -- LED Blue

-- Working on Pulse with Modulation

function led(r,g,b) -- RGB LED

pwm.setduty(1,r) -- Set working on 1 LED Red

pwm.setduty(2,g) -- Set to work on 2 LED Green

pwm.setduty(3,b) -- Set to work on 3 LED Blue

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) -- LED Red

led(0,0,512) -- LED Blue

Sample code for LED

-- Sample code for driving LED

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

-- Sample code for driving LED

lighton=0

tmr.alarm(0,1000,1,function() -- Timer will be 1 second

if lighton==0 then

lighton=1

led(512,512,512)

-- 512/1024, 50% duty cycle

else

lighton=0

led(0,0,0)

end

end)

Sample code for Bootstrap

--initialize LUA will be executed

file.open("init.lua","w")
file.writeline([[print("Hello 14core.com")]])
file.close()
node.restart()  -- this will restart the module.

--initialize LUA will be executed

file.open("init.lua","w")

file.writeline([[print("Hello 14core.com")]])

file.close()

node.restart() -- this will restart the module.

Working on Timer to Repeat

 -- Working on Timer to Repeat
tmr.alarm(1,5000,1,function() print("alarm 1") end) -- Timer alarm 5 Second
tmr.alarm(0,1000,1,function() print("alarm 0") end) -- Timer alarm 1 Second
tmr.alarm(2,2000,1,function() print("alarm 2") end) -- Timer alarm 2 Second
-- Delay
tmr.stop(0)

-- Working on Timer to Repeat

tmr.alarm(1,5000,1,function() print("alarm 1") end) -- Timer alarm 5 Second

tmr.alarm(0,1000,1,function() print("alarm 0") end) -- Timer alarm 1 Second

tmr.alarm(2,2000,1,function() print("alarm 2") end) -- Timer alarm 2 Second

-- Delay

tmr.stop(0)

Simple demonstration using LUA Script working on TELNET SERVER

 -- Demonstration using LUA Script working on TELNET Server
-- Simple demonstration how to use 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)), will support multiple separate lines
    end)
    c:on("disconnection",function(c)
      node.output(nil)        
      --unregistered redirect the output function, the output will goes to the serial communication
    end)
    print("Welcome to 14Core.com World.")
end)

-- Demonstration using LUA Script working on TELNET Server

-- Simple demonstration how to use 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

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)), will support multiple separate lines

end)

c:on("disconnection",function(c)

node.output(nil)

--unregistered redirect the output function, the output will goes to the serial communication

end)

print("Welcome to 14Core.com World.")

end)

Demonstration how to Interfe with sensor in NodeMCU

-- reading temperature with DS18B20 sensor
t=require("ds18b20")
t.setup(9)
addrs=t.addrs()
-- Total numbers Output of DS18B20 Sensor just 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))
-- you need to release after use
t = nil
ds18b20 = nil
package.loaded["ds18b20"]=nil

-- reading temperature with DS18B20 sensor

t=require("ds18b20")

t.setup(9)

addrs=t.addrs()

-- Total numbers Output of DS18B20 Sensor just 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))

-- you need to release after use

t = nil

ds18b20 = nil

package.loaded["ds18b20"]=nil

New Firmware > https://github.com/nodemcu/nodemcu-firmware/releases/tag/0.9.6-dev_20150704

What is NodeMCU How to Code LUA Script with a Simple Lines of Code

Tagged on: Internet of Things NodeMCU NodeMCU Tutorial

3 thoughts on “What is NodeMCU How to Code LUA Script with a Simple Lines of Code”

Norman
at

Please kindly provide user manual and installation guide for ESPlorer IDE.
Thanks in Advance.
14core EditorPost author
at

Please visit the this http://www.14core.com/drivers/ , you can just follow the instructions from installing the software, flashing the NodeMCU and how to compiler your LUA Script.
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at

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