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# **NodeMcu** #
version 0.9.4
###A lua based firmware for wifi-soc esp8266
Build on [ESP8266 sdk 0.9.4](http://bbs.espressif.com/viewtopic.php?f=5&t=90)<br />
Lua core based on [eLua project](http://www.eluaproject.net/)<br />
File system based on [spiffs](https://github.com/pellepl/spiffs)<br />
Open source development kit for NodeMCU [nodemcu-devkit](https://github.com/nodemcu/nodemcu-devkit)<br />
Flash tool for NodeMCU [nodemcu-flasher](https://github.com/nodemcu/nodemcu-flasher)<br />
wiki: [nodemcu wiki](https://github.com/nodemcu/nodemcu-firmware/wiki)<br />
home: [nodemcu.com](http://www.nodemcu.com)<br />
bbs: [中文论坛Chinese bbs](http://bbs.nodemcu.com)<br />
Tencent QQ group QQ群: 309957875<br />
# Change log
2014-12-22<br />
update to sdk 0.9.4<br />
opensource
2014-12-19<br />
**Important** Re-arrange GPIO MAP due to development kit.[New Gpio Map](#new_gpio_map)<br />
Add bitwise operation module.<br />
Modify net.socket:connect() api to accept domain name, auto DNS.
[more change log](https://github.com/nodemcu/nodemcu-firmware/wiki/nodemcu_api_en#change_log)<br />
[更多变更日志](https://github.com/nodemcu/nodemcu-firmware/wiki/nodemcu_api_cn#change_log)
# Summary
- Easy to access wireless router
- Based on Lua 5.1.4
- Event-Drive programming preferred.
- Build-in file, timer, pwm, i2c, 1-wire, net, gpio, wifi, adc, uart and system api.
- GPIO pin re-mapped, use the index to access gpio, i2c, pwm.
- GPIO Map Table:
##GPIO NEW TABLE ( Build 20141219 and later)
<a id="new_gpio_map"></a>
<table>
<tr>
<th scope="col">IO index</th><th scope="col">ESP8266 pin</th><th scope="col">IO index</th><th scope="col">ESP8266 pin</th>
</tr>
<tr>
<td>0 [*]</td><td>GPIO16</td><td>8</td><td>GPIO15</td>
</tr>
<tr>
<td>1</td><td>GPIO4</td><td>9</td><td>GPIO3</td>
</tr>
<tr>
<td>2</td><td>GPIO5</td><td>10</td><td>GPIO1</td>
</tr>
<tr>
<td>3</td><td>GPIO0</td><td>11</td><td>GPIO9</td>
</tr>
<tr>
<td>4</td><td>GPIO2</td><td>12</td><td>GPIO10</td>
</tr>
<tr>
<td>5</td><td>GPIO14</td><td></td><td></td>
</tr>
<tr>
<td>6</td><td>GPIO12</td><td></td><td></td>
</tr>
<tr>
<td>7</td><td>GPIO13</td<td></td><td></td>
</tr>
</table>
#### [*] D0(GPIO16) can only be used as gpio read/write. no interrupt supported. no pwm/i2c/ow supported.
##GPIO OLD TABLE (Before build 20141212)
<a id="old_gpio_map"></a>
<table>
<tr>
<th scope="col">IO index</th><th scope="col">ESP8266 pin</th><th scope="col">IO index</th><th scope="col">ESP8266 pin</th>
</tr>
<tr>
<td>0</td><td>GPIO12</td><td>8</td><td>GPIO0</td>
</tr>
<tr>
<td>1</td><td>GPIO13</td><td>9</td><td>GPIO2</td>
</tr>
<tr>
<td>2</td><td>GPIO14</td><td>10</td><td>GPIO4</td>
</tr>
<tr>
<td>3</td><td>GPIO15</td><td>11</td><td>GPIO5</td>
</tr>
<tr>
<td>4</td><td>GPIO3</td><td></td><td></td>
</tr>
<tr>
<td>5</td><td>GPIO1</td><td></td><td></td>
</tr>
<tr>
<td>6</td><td>GPIO9</td><td></td><td></td>
</tr>
<tr>
<td>7</td><td>GPIO10</td<td></td><td></td>
</tr>
</table>
#Build option
####file ./app/include/user_config.h
```c
#define FLASH_512K
// #define FLASH_1M
// #define FLASH_2M
// #define FLASH_4M
...
#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
#endif /* LUA_USE_MODULES */
```
#Flash the firmware
nodemcu_512k.bin: 0x00000<br />
for most esp8266 modules, just pull GPIO0 down and restart.<br />
You can use the [nodemcu-flasher](https://github.com/nodemcu/nodemcu-flasher) to burn the firmware.
#Connect the hardware in serial
braudrate:9600
#Start play
####Connect to your ap
```lua
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
```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("<h1> Hello, NodeMcu.</h1>")
end)
conn:on("sent",function(conn) conn:close() end)
end)
```
####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
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
package.loaded["ds18b20"]=nil
```
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