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.codehilite pre .il { color: #945277 } /* Literal.Number.Integer.Long */</style><title>README</title></head><body><article class="markdown-body"><h1 id="nodemcu"><strong>NodeMcu</strong></h1>
<h3 id="a-lua-based-firmware-for-wifi-soc-esp8266"><a name="user-content-a-lua-based-firmware-for-wifi-soc-esp8266" href="#a-lua-based-firmware-for-wifi-soc-esp8266" class="headeranchor-link" aria-hidden="true"><span class="headeranchor"></span></a>A lua based firmware for wifi-soc esp8266</h3>
<p>version 0.9.2 build 2014-12-11</p>
<h1 id="change-log"><a name="user-content-change-log" href="#change-log" class="headeranchor-link" aria-hidden="true"><span class="headeranchor"></span></a>Change log</h1>
<p>2014-12-09<br /><br />
increased the number of alarm in tmr module, now it has 7 alarm. <br /></p>
<p>2014-12-08<br /><br />
add uart.setup(), uart.write() api.<br /></p>
<p><a href="https://github.com/nodemcu/nodemcu-firmware/wiki/nodemcu_api_en#change_log">more change log</a><br /><br />
<a href="https://github.com/nodemcu/nodemcu-firmware/wiki/nodemcu_api_cn#change_log">更多变更日志</a></p>
<h1 id="summary"><a name="user-content-summary" href="#summary" class="headeranchor-link" aria-hidden="true"><span class="headeranchor"></span></a>Summary</h1>
<ul>
<li>Easy to access wireless router</li>
<li>Based on Lua 5.1.4</li>
<li>Event-Drive programming preferred.</li>
<li>Build-in file, timer, pwm, i2c, 1-wire, net, gpio, wifi, adc, uart and system api.</li>
<li>GPIO pin re-mapped, use the index to access gpio, i2c, pwm.</li>
<li>GPIO Map Table:</li>
</ul>
<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>
<h1 id="flash-the-firmware"><a name="user-content-flash-the-firmware" href="#flash-the-firmware" class="headeranchor-link" aria-hidden="true"><span class="headeranchor"></span></a>Flash the firmware</h1>
<p>nodemcu_512k.bin: 0x00000<br /><br />
for most esp8266 modules, just pull GPIO0 down and restart.<br /><br />
You can use the <a href="https://github.com/nodemcu/nodemcu-flasher">nodemcu-flasher</a> to burn the firmware.</p>
<h1 id="connect-the-hardware-in-serial"><a name="user-content-connect-the-hardware-in-serial" href="#connect-the-hardware-in-serial" class="headeranchor-link" aria-hidden="true"><span class="headeranchor"></span></a>Connect the hardware in serial</h1>
<p>braudrate:9600</p>
<h1 id="start-play"><a name="user-content-start-play" href="#start-play" class="headeranchor-link" aria-hidden="true"><span class="headeranchor"></span></a>Start play</h1>
<h4 id="connect-to-your-ap"><a name="user-content-connect-to-your-ap" href="#connect-to-your-ap" class="headeranchor-link" aria-hidden="true"><span class="headeranchor"></span></a>Connect to your ap</h4>
<div class="codehilite"><pre> <span class="nb">print</span><span class="p">(</span><span class="n">wifi</span><span class="p">.</span><span class="n">sta</span><span class="p">.</span><span class="n">getip</span><span class="p">())</span>
<span class="c1">--0.0.0.0</span>
<span class="n">wifi</span><span class="p">.</span><span class="n">setmode</span><span class="p">(</span><span class="n">wifi</span><span class="p">.</span><span class="n">STATION</span><span class="p">)</span>
<span class="n">wifi</span><span class="p">.</span><span class="n">sta</span><span class="p">.</span><span class="n">config</span><span class="p">(</span><span class="s2">&quot;</span><span class="s">SSID&quot;</span><span class="p">,</span><span class="s2">&quot;</span><span class="s">password&quot;</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="n">wifi</span><span class="p">.</span><span class="n">sta</span><span class="p">.</span><span class="n">getip</span><span class="p">())</span>
<span class="c1">--192.168.18.110</span>
</pre></div>
<h4 id="manipulate-hardware-like-a-arduino"><a name="user-content-manipulate-hardware-like-a-arduino" href="#manipulate-hardware-like-a-arduino" class="headeranchor-link" aria-hidden="true"><span class="headeranchor"></span></a>Manipulate hardware like a arduino</h4>
<div class="codehilite"><pre> <span class="n">pin</span> <span class="o">=</span> <span class="mi">1</span>
<span class="n">gpio</span><span class="p">.</span><span class="n">mode</span><span class="p">(</span><span class="n">pin</span><span class="p">,</span><span class="n">gpio</span><span class="p">.</span><span class="n">OUTPUT</span><span class="p">)</span>
<span class="n">gpio</span><span class="p">.</span><span class="n">write</span><span class="p">(</span><span class="n">pin</span><span class="p">,</span><span class="n">gpio</span><span class="p">.</span><span class="n">HIGH</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="n">gpio</span><span class="p">.</span><span class="n">read</span><span class="p">(</span><span class="n">pin</span><span class="p">))</span>
</pre></div>
<h4 id="write-network-application-in-nodejs-style"><a name="user-content-write-network-application-in-nodejs-style" href="#write-network-application-in-nodejs-style" class="headeranchor-link" aria-hidden="true"><span class="headeranchor"></span></a>Write network application in nodejs style</h4>
<div class="codehilite"><pre> <span class="c1">-- A simple http client</span>
<span class="n">conn</span><span class="o">=</span><span class="n">net</span><span class="p">.</span><span class="n">createConnection</span><span class="p">(</span><span class="n">net</span><span class="p">.</span><span class="n">TCP</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span>
<span class="n">conn</span><span class="p">:</span><span class="n">on</span><span class="p">(</span><span class="s2">&quot;</span><span class="s">receive&quot;</span><span class="p">,</span> <span class="k">function</span><span class="p">(</span><span class="n">conn</span><span class="p">,</span> <span class="n">payload</span><span class="p">)</span> <span class="nb">print</span><span class="p">(</span><span class="n">payload</span><span class="p">)</span> <span class="k">end</span> <span class="p">)</span>
<span class="n">conn</span><span class="p">:</span><span class="n">connect</span><span class="p">(</span><span class="mi">80</span><span class="p">,</span><span class="s2">&quot;</span><span class="s">115.239.210.27&quot;</span><span class="p">)</span>
<span class="n">conn</span><span class="p">:</span><span class="n">send</span><span class="p">(</span><span class="s2">&quot;</span><span class="s">GET / HTTP/1.1</span><span class="se">\r\n</span><span class="s">Host: www.baidu.com</span><span class="se">\r\n</span><span class="s">&quot;</span>
<span class="o">..</span><span class="s2">&quot;</span><span class="s">Connection: keep-alive</span><span class="se">\r\n</span><span class="s">Accept: */*</span><span class="se">\r\n\r\n</span><span class="s">&quot;</span><span class="p">)</span>
</pre></div>
<h4 id="or-a-simple-http-server"><a name="user-content-or-a-simple-http-server" href="#or-a-simple-http-server" class="headeranchor-link" aria-hidden="true"><span class="headeranchor"></span></a>Or a simple http server</h4>
<div class="codehilite"><pre> <span class="c1">-- A simple http server</span>
<span class="n">srv</span><span class="o">=</span><span class="n">net</span><span class="p">.</span><span class="n">createServer</span><span class="p">(</span><span class="n">net</span><span class="p">.</span><span class="n">TCP</span><span class="p">)</span>
<span class="n">srv</span><span class="p">:</span><span class="n">listen</span><span class="p">(</span><span class="mi">80</span><span class="p">,</span><span class="k">function</span><span class="p">(</span><span class="n">conn</span><span class="p">)</span>
<span class="n">conn</span><span class="p">:</span><span class="n">on</span><span class="p">(</span><span class="s2">&quot;</span><span class="s">receive&quot;</span><span class="p">,</span><span class="k">function</span><span class="p">(</span><span class="n">conn</span><span class="p">,</span><span class="n">payload</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="n">payload</span><span class="p">)</span>
<span class="n">conn</span><span class="p">:</span><span class="n">send</span><span class="p">(</span><span class="s2">&quot;</span><span class="s">&lt;h1&gt; Hello, NodeMcu.&lt;/h1&gt;&quot;</span><span class="p">)</span>
<span class="k">end</span><span class="p">)</span>
<span class="n">conn</span><span class="p">:</span><span class="n">on</span><span class="p">(</span><span class="s2">&quot;</span><span class="s">sent&quot;</span><span class="p">,</span><span class="k">function</span><span class="p">(</span><span class="n">conn</span><span class="p">)</span> <span class="n">conn</span><span class="p">:</span><span class="n">close</span><span class="p">()</span> <span class="k">end</span><span class="p">)</span>
<span class="k">end</span><span class="p">)</span>
</pre></div>
<h4 id="do-something-shining"><a name="user-content-do-something-shining" href="#do-something-shining" class="headeranchor-link" aria-hidden="true"><span class="headeranchor"></span></a>Do something shining</h4>
<div class="codehilite"><pre> <span class="k">function</span> <span class="nf">led</span><span class="p">(</span><span class="n">r</span><span class="p">,</span><span class="n">g</span><span class="p">,</span><span class="n">b</span><span class="p">)</span>
<span class="n">pwm</span><span class="p">.</span><span class="n">setduty</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span><span class="n">r</span><span class="p">)</span>
<span class="n">pwm</span><span class="p">.</span><span class="n">setduty</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span><span class="n">g</span><span class="p">)</span>
<span class="n">pwm</span><span class="p">.</span><span class="n">setduty</span><span class="p">(</span><span class="mi">2</span><span class="p">,</span><span class="n">b</span><span class="p">)</span>
<span class="k">end</span>
<span class="n">pwm</span><span class="p">.</span><span class="n">setup</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span><span class="mi">500</span><span class="p">,</span><span class="mi">512</span><span class="p">)</span>
<span class="n">pwm</span><span class="p">.</span><span class="n">setup</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span><span class="mi">500</span><span class="p">,</span><span class="mi">512</span><span class="p">)</span>
<span class="n">pwm</span><span class="p">.</span><span class="n">setup</span><span class="p">(</span><span class="mi">2</span><span class="p">,</span><span class="mi">500</span><span class="p">,</span><span class="mi">512</span><span class="p">)</span>
<span class="n">pwm</span><span class="p">.</span><span class="n">start</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
<span class="n">pwm</span><span class="p">.</span><span class="n">start</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
<span class="n">pwm</span><span class="p">.</span><span class="n">start</span><span class="p">(</span><span class="mi">2</span><span class="p">)</span>
<span class="n">led</span><span class="p">(</span><span class="mi">512</span><span class="p">,</span><span class="mi">0</span><span class="p">,</span><span class="mi">0</span><span class="p">)</span> <span class="c1">-- red</span>
<span class="n">led</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span><span class="mi">0</span><span class="p">,</span><span class="mi">512</span><span class="p">)</span> <span class="c1">-- blue</span>
</pre></div>
<h4 id="and-blink-it"><a name="user-content-and-blink-it" href="#and-blink-it" class="headeranchor-link" aria-hidden="true"><span class="headeranchor"></span></a>And blink it</h4>
<div class="codehilite"><pre> <span class="n">lighton</span><span class="o">=</span><span class="mi">0</span>
<span class="n">tmr</span><span class="p">.</span><span class="n">alarm</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span><span class="mi">1000</span><span class="p">,</span><span class="mi">1</span><span class="p">,</span><span class="k">function</span><span class="p">()</span>
<span class="k">if</span> <span class="n">lighton</span><span class="o">==</span><span class="mi">0</span> <span class="k">then</span>
<span class="n">lighton</span><span class="o">=</span><span class="mi">1</span>
<span class="n">led</span><span class="p">(</span><span class="mi">512</span><span class="p">,</span><span class="mi">512</span><span class="p">,</span><span class="mi">512</span><span class="p">)</span>
<span class="k">else</span>
<span class="n">lighton</span><span class="o">=</span><span class="mi">0</span>
<span class="n">led</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span><span class="mi">0</span><span class="p">,</span><span class="mi">0</span><span class="p">)</span>
<span class="k">end</span>
<span class="k">end</span><span class="p">)</span>
</pre></div>
<h4 id="if-you-want-to-run-something-when-system-started"><a name="user-content-if-you-want-to-run-something-when-system-started" href="#if-you-want-to-run-something-when-system-started" class="headeranchor-link" aria-hidden="true"><span class="headeranchor"></span></a>If you want to run something when system started</h4>
<div class="codehilite"><pre> <span class="c1">--init.lua will be excuted</span>
<span class="n">file</span><span class="p">.</span><span class="n">open</span><span class="p">(</span><span class="s2">&quot;</span><span class="s">init.lua&quot;</span><span class="p">,</span><span class="s2">&quot;</span><span class="s">w&quot;</span><span class="p">)</span>
<span class="n">file</span><span class="p">.</span><span class="n">writeline</span><span class="p">(</span><span class="s">[[print(&quot;Hello, do this at the beginning.&quot;)]]</span><span class="p">)</span>
<span class="n">file</span><span class="p">.</span><span class="n">close</span><span class="p">()</span>
<span class="n">node</span><span class="p">.</span><span class="n">restart</span><span class="p">()</span> <span class="c1">-- this will restart the module.</span>
</pre></div>
<h4 id="with-below-code-you-can-telnet-to-your-esp8266-now"><a name="user-content-with-below-code-you-can-telnet-to-your-esp8266-now" href="#with-below-code-you-can-telnet-to-your-esp8266-now" class="headeranchor-link" aria-hidden="true"><span class="headeranchor"></span></a>With below code, you can telnet to your esp8266 now</h4>
<div class="codehilite"><pre> <span class="c1">-- a simple telnet server</span>
<span class="n">s</span><span class="o">=</span><span class="n">net</span><span class="p">.</span><span class="n">createServer</span><span class="p">(</span><span class="n">net</span><span class="p">.</span><span class="n">TCP</span><span class="p">,</span><span class="mi">180</span><span class="p">)</span>
<span class="n">s</span><span class="p">:</span><span class="n">listen</span><span class="p">(</span><span class="mi">2323</span><span class="p">,</span><span class="k">function</span><span class="p">(</span><span class="n">c</span><span class="p">)</span>
<span class="k">function</span> <span class="nf">s_output</span><span class="p">(</span><span class="n">str</span><span class="p">)</span>
<span class="k">if</span><span class="p">(</span><span class="n">c</span><span class="o">~=</span><span class="kc">nil</span><span class="p">)</span>
<span class="k">then</span> <span class="n">c</span><span class="p">:</span><span class="n">send</span><span class="p">(</span><span class="n">str</span><span class="p">)</span>
<span class="k">end</span>
<span class="k">end</span>
<span class="n">node</span><span class="p">.</span><span class="n">output</span><span class="p">(</span><span class="n">s_output</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span> <span class="c1">-- re-direct output to function s_ouput.</span>
<span class="n">c</span><span class="p">:</span><span class="n">on</span><span class="p">(</span><span class="s2">&quot;</span><span class="s">receive&quot;</span><span class="p">,</span><span class="k">function</span><span class="p">(</span><span class="n">c</span><span class="p">,</span><span class="n">l</span><span class="p">)</span>
<span class="n">node</span><span class="p">.</span><span class="n">input</span><span class="p">(</span><span class="n">l</span><span class="p">)</span> <span class="c1">-- works like pcall(loadstring(l)) but support multiple separate line</span>
<span class="k">end</span><span class="p">)</span>
<span class="n">c</span><span class="p">:</span><span class="n">on</span><span class="p">(</span><span class="s2">&quot;</span><span class="s">disconnection&quot;</span><span class="p">,</span><span class="k">function</span><span class="p">(</span><span class="n">c</span><span class="p">)</span>
<span class="n">node</span><span class="p">.</span><span class="n">output</span><span class="p">(</span><span class="kc">nil</span><span class="p">)</span> <span class="c1">-- un-regist the redirect output function, output goes to serial</span>
<span class="k">end</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">&quot;</span><span class="s">Welcome to NodeMcu world.&quot;</span><span class="p">)</span>
<span class="k">end</span><span class="p">)</span>
</pre></div>
<h4 id="use-ds18b20-module-extends-your-esp8266"><a name="user-content-use-ds18b20-module-extends-your-esp8266" href="#use-ds18b20-module-extends-your-esp8266" class="headeranchor-link" aria-hidden="true"><span class="headeranchor"></span></a>Use DS18B20 module extends your esp8266</h4>
<div class="codehilite"><pre> <span class="c1">-- read temperature with DS18B20</span>
<span class="n">t</span><span class="o">=</span><span class="nb">require</span><span class="p">(</span><span class="s2">&quot;</span><span class="s">ds18b20&quot;</span><span class="p">)</span>
<span class="n">t</span><span class="p">.</span><span class="n">setup</span><span class="p">(</span><span class="mi">9</span><span class="p">)</span>
<span class="n">addrs</span><span class="o">=</span><span class="n">t</span><span class="p">.</span><span class="n">addrs</span><span class="p">()</span>
<span class="c1">-- Total DS18B20 numbers, assume it is 2</span>
<span class="nb">print</span><span class="p">(</span><span class="n">table</span><span class="p">.</span><span class="n">getn</span><span class="p">(</span><span class="n">addrs</span><span class="p">))</span>
<span class="c1">-- The first DS18B20</span>
<span class="nb">print</span><span class="p">(</span><span class="n">t</span><span class="p">.</span><span class="n">read</span><span class="p">(</span><span class="n">addrs</span><span class="p">[</span><span class="mi">1</span><span class="p">],</span><span class="n">t</span><span class="p">.</span><span class="n">C</span><span class="p">))</span>
<span class="nb">print</span><span class="p">(</span><span class="n">t</span><span class="p">.</span><span class="n">read</span><span class="p">(</span><span class="n">addrs</span><span class="p">[</span><span class="mi">1</span><span class="p">],</span><span class="n">t</span><span class="p">.</span><span class="n">F</span><span class="p">))</span>
<span class="nb">print</span><span class="p">(</span><span class="n">t</span><span class="p">.</span><span class="n">read</span><span class="p">(</span><span class="n">addrs</span><span class="p">[</span><span class="mi">1</span><span class="p">],</span><span class="n">t</span><span class="p">.</span><span class="n">K</span><span class="p">))</span>
<span class="c1">-- The second DS18B20</span>
<span class="nb">print</span><span class="p">(</span><span class="n">t</span><span class="p">.</span><span class="n">read</span><span class="p">(</span><span class="n">addrs</span><span class="p">[</span><span class="mi">2</span><span class="p">],</span><span class="n">t</span><span class="p">.</span><span class="n">C</span><span class="p">))</span>
<span class="nb">print</span><span class="p">(</span><span class="n">t</span><span class="p">.</span><span class="n">read</span><span class="p">(</span><span class="n">addrs</span><span class="p">[</span><span class="mi">2</span><span class="p">],</span><span class="n">t</span><span class="p">.</span><span class="n">F</span><span class="p">))</span>
<span class="nb">print</span><span class="p">(</span><span class="n">t</span><span class="p">.</span><span class="n">read</span><span class="p">(</span><span class="n">addrs</span><span class="p">[</span><span class="mi">2</span><span class="p">],</span><span class="n">t</span><span class="p">.</span><span class="n">K</span><span class="p">))</span>
<span class="c1">-- Just read</span>
<span class="nb">print</span><span class="p">(</span><span class="n">t</span><span class="p">.</span><span class="n">read</span><span class="p">())</span>
<span class="c1">-- Just read as centigrade</span>
<span class="nb">print</span><span class="p">(</span><span class="n">t</span><span class="p">.</span><span class="n">read</span><span class="p">(</span><span class="kc">nil</span><span class="p">,</span><span class="n">t</span><span class="p">.</span><span class="n">C</span><span class="p">))</span>
<span class="c1">-- Don&#39;t forget to release it after use</span>
<span class="n">t</span> <span class="o">=</span> <span class="kc">nil</span>
<span class="nb">package.loaded</span><span class="p">[</span><span class="s2">&quot;</span><span class="s">ds18b20&quot;</span><span class="p">]</span><span class="o">=</span><span class="kc">nil</span>
</pre></div>
<h1 id="check-this-out"><a name="user-content-check-this-out" href="#check-this-out" class="headeranchor-link" aria-hidden="true"><span class="headeranchor"></span></a>Check this out</h1>
<p>Tencent QQ group: 309957875<br/><br />
<a href="https://github.com/nodemcu/nodemcu-firmware/wiki">nodemcu wiki</a><br/><br />
<a href="http://www.nodemcu.com">nodemcu.com</a></p></article></body></html>
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