# **NodeMcu** #
version 0.9.5
[](https://travis-ci.org/nodemcu/nodemcu-firmware)
###A lua based firmware for wifi-soc esp8266
Build on [ESP8266 sdk 0.9.5](http://bbs.espressif.com/viewtopic.php?f=5&t=154)
Lua core based on [eLua project](http://www.eluaproject.net/)
File system based on [spiffs](https://github.com/pellepl/spiffs)
Open source development kit for NodeMCU [nodemcu-devkit](https://github.com/nodemcu/nodemcu-devkit)
Flash tool for NodeMCU [nodemcu-flasher](https://github.com/nodemcu/nodemcu-flasher)
wiki: [nodemcu wiki](https://github.com/nodemcu/nodemcu-firmware/wiki)
api: [nodemcu api](https://github.com/nodemcu/nodemcu-firmware/wiki/nodemcu_api_en)
home: [nodemcu.com](http://www.nodemcu.com)
bbs: [Chinese bbs](http://bbs.nodemcu.com)
Tencent QQ group: 309957875
# Summary
- Easy to access wireless router
- Based on Lua 5.1.4 (without *io, math, debug, os* module.)
- Event-Drive programming preferred.
- Build-in file, timer, pwm, i2c, spi, 1-wire, net, mqtt, gpio, wifi, adc, uart and system api.
- GPIO pin re-mapped, use the index to access gpio, i2c, pwm.
# To Do List (pull requests are very welcomed)
- fix wifi smart connect
- add spi module (done)
- add mqtt module (done)
- add coap module (in coap branch)
- cross compiler (done)
# Change log
2015-02-13
add node.compile() api to compile lua text file into lua bytecode file.
this will reduce memory usage noticeably when require modules into NodeMCU.
raise internal LUA_BUFFERSIZE from 1024 to 4096.
lua require("mod") will load "mod.lc" file first if exist.
build latest pre_build bin.
2015-02-12
fix float print.
update spiffs, add file.rename api to file module.
fix some file system bug. need more tests.
add support to 8Mbyte, 16Mbyte flash.
remove node.led() and node.key() api.
some update to lua_modules and examples.
build latest pre_build bin.
2015-01-27
support floating point LUA.
use macro LUA_NUMBER_INTEGRAL in user_config.h control this feature.
LUA_NUMBER_INTEGRAL to disable floating point support,
// LUA_NUMBER_INTEGRAL to enable floating point support.
fix tmr.time(). #132
fix filesystem length. #113
fix ssl reboots. #134
build pre_build bin.
2015-01-26
applied sdk095_patch1 to sdk 0.9.5.
added LUA examples and modules [by dvv](https://github.com/dvv).
added node.readvdd33() API [by alonewolfx2](https://github.com/alonewolfx2).
build pre_build bin.
[more change log](https://github.com/nodemcu/nodemcu-firmware/wiki)
##GPIO NEW TABLE ( Build 20141219 and later)
| IO index | ESP8266 pin | IO index | ESP8266 pin |
| 0 [*] | GPIO16 | 8 | GPIO15 |
| 1 | GPIO5 | 9 | GPIO3 |
| 2 | GPIO4 | 10 | GPIO1 |
| 3 | GPIO0 | 11 | GPIO9 |
| 4 | GPIO2 | 12 | GPIO10 |
| 5 | GPIO14 | | |
| 6 | GPIO12 | | |
| 7 | GPIO13 | | |
#### [*] D0(GPIO16) can only be used as gpio read/write. no interrupt supported. no pwm/i2c/ow supported.
#Build option
####file ./app/include/user_config.h
```c
// #define FLASH_512K
// #define FLASH_1M
// #define FLASH_2M
// #define FLASH_4M
#define FLASH_AUTOSIZE
...
#define LUA_USE_MODULES
#ifdef LUA_USE_MODULES
#define LUA_USE_MODULES_NODE
#define LUA_USE_MODULES_FILE
#define LUA_USE_MODULES_GPIO
#define LUA_USE_MODULES_WIFI
#define LUA_USE_MODULES_NET
#define LUA_USE_MODULES_PWM
#define LUA_USE_MODULES_I2C
#define LUA_USE_MODULES_TMR
#define LUA_USE_MODULES_ADC
#define LUA_USE_MODULES_UART
#define LUA_USE_MODULES_OW
#define LUA_USE_MODULES_BIT
#define LUA_USE_MODULES_WS2812
#endif /* LUA_USE_MODULES */
...
// LUA_NUMBER_INTEGRAL
```
#Flash the firmware
nodemcu_latest.bin: 0x00000
for most esp8266 modules, just pull GPIO0 down and restart.
You can use the [nodemcu-flasher](https://github.com/nodemcu/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
```lua
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
```lua
pin = 1
gpio.mode(pin,gpio.OUTPUT)
gpio.write(pin,gpio.HIGH)
print(gpio.read(pin))
```
####Write network application in nodejs style
```lua
-- 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
```lua
-- 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
```lua
-- 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
```lua
-- 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")
```
####Do something shining
```lua
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
```
####And blink it
```lua
lighton=0
tmr.alarm(1,1000,1,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
```lua
--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
```lua
-- 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)
```
####Use DS18B20 module extends your esp8266
```lua
-- read temperature with DS18B20
node.compile("ds18b20.lua") -- run this only once to compile and save to "ds18b20.lc"
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
```
####Control a WS2812 based light strip
```lua
-- set the color of one LED on GPIO 2 to red
ws2812.write(4, string.char(0, 255, 0))
-- set the color of 10 LEDs on GPIO 0 to blue
ws2812.write(3, string.char(0, 0, 255):rep(10))
-- first LED green, second LED white
ws2812.write(4, string.char(255, 0, 0, 255, 255, 255))
```