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NodeMCU

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維基百科，自由的百科全書
NodeMCU
NodeMCU DEVKIT 1.0 BETA
研發商ESP8266開源社區
類型片上系統
作業系統XTOS
電源USB
中央處理器ESP8266[1](LX106[2])
記憶體20kBytes
硬碟儲存空間4MBytes[3]
網站http://www.nodemcu.com
NodeMCU DEVKIT 1.0 BETA 背面

NodeMCU是一個開源[4]的物聯網平台。 它使用Lua手稿語言編程[4]。該平台基於eLua [5]開源專案,底層使用ESP8266 sdk 0.9.5版本。該平台使用了很多開源專案, 例如 lua-cjson[6], spiffs[7]. NodeMCU包含了可以執行在 esp8266 Wi-Fi SoC晶片之上的韌體,以及基於ESP-12模組的硬件。

已隱藏部分未翻譯內容，歡迎參與翻譯。

History

NodeMCU is started after ESP8266 come out. In December 30, 2013, Espressif systems begin production of ESP8266.[8] ESP8266 is an Wi-Fi SoC and integrated with LX106 core, widely used in IoT applications(See related projects[9][10][11]). In 13 Oct 2014, Hong committed first file of nodemcu-firmware to github,[12] NodeMCU project started. And then more and more developers from ESP8266 opensource community join in NodeMCU developer team. On 1 Dec 2014, Huang R commit the gerber file of an ESP8266 board, then NodeMCU project have the first open-hardware which named devkit 1.0,[13] thus NodeMCU is not only a firmware, it becomes a platform. In 31 Dec 2014, Tuan PM port MQTT client library from Contiki to ESP8266 SoC platform,[14] and commit to NodeMCU project, then NodeMCU can support MQTT IoT protocol, using Lua access MQTT broker, it is an important update of firmware. Another important update is in 30 Jan 2015, Devsaurus port u8glib[15] to NodeMCU project,[16] and NodeMCU can drive LCD, Screen, OLED, even VGA display module easily.

韌體燒寫

nodemcu_latest.bin: 0x00000
對於大多數 esp8266 模組, 直接拉低 GPIO0 引腳的電平，並且重新上電或重新啟動。
可以使用 nodemcu-flasher（頁面存檔備份，存於互聯網檔案館） 燒寫韌體[17]。

特別的，如果你想編譯/構建自己的韌體，需要注意以下燒寫地址：
0x00000.bin: 0x00000
0x10000.bin: 0x10000

注意，在燒寫之後，最好執行 file.format()

硬件連接

如果使用 NodeMCU devkit, 只需要安裝 CH340G 驅動程式[17], 並且將開發模組使用micro-usb 線連接到電腦。 然後，將波特率設為9600, 並打開序列埠。若使用普通的esp8266模組, 則必須準備usb-ttl 轉接器。

程式舉例

連接Wi-Fi熱點

    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

如同arduino般操作硬體

    pin = 1
    gpio.mode(pin,gpio.OUTPUT)
    gpio.write(pin,gpio.HIGH)
    print(gpio.read(pin))

使用 nodejs 風格網絡編程

    -- 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")

簡易的HTTP伺服器

    -- 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)

連接 MQTT Broker

-- 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 客戶端與伺服器

-- 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")

參照文獻

  1. ^ Kumar, Abhijeet, and Apoorva Sharma. "Internet of Life (IOL)." (2015). ISBN 978-93-5156-328-0
  2. ^ Brian Benchoff. An SDK for the ESP8266 Wi-Fi chip. Hackaday. 
  3. ^ Vowstar. NodeMCU Devkit. Github. NodeMCU Team. [2 April 2015]. （原始內容存檔於2015-08-15）. 
  4. ^ 4.0 4.1 存档副本. [2015-04-01]. （原始內容存檔於2015-08-12）. 
  5. ^ 存档副本. [2015-04-01]. （原始內容存檔於2010-12-27）. 
  6. ^ 存档副本. [2015-04-01]. （原始內容存檔於2015-12-31）. 
  7. ^ 存档副本. [2015-04-01]. （原始內容存檔於2015-11-03）. 
  8. ^ Espressif system. IoT Wi-Fi 802.11b/g/n integrated SoC implementation of volume production. 中國上海訊. December 30, 2013 [2 April 2015]. （原始內容存檔於2015-04-02）. 
  9. ^ 參照錯誤：沒有為名為the button的參考文獻提供內容
  10. ^ 參照錯誤：沒有為名為node usb的參考文獻提供內容
  11. ^ 參照錯誤：沒有為名為ijwatch的參考文獻提供內容
  12. ^ Hong. First commit of NodeMCU Firmware. Github. [2 April 2015]. （原始內容存檔於2021-08-15）. 
  13. ^ Huang R. Initial design of NodeMCU devkit. Github. [2 April 2015]. （原始內容存檔於2021-08-15）. 
  14. ^ Tuan PM. MQTT client library for ESP8266. Github. [2 April 2015]. （原始內容存檔於2017-01-02）. 
  15. ^ Olikraus; Daniel Sittig. Universal Graphics Library for 8 Bit Embedded Systems. Google code. [2 April 2015]. （原始內容存檔於2015-04-06）. 
  16. ^ Devsaurus. U8glib for esp8266. Github. [2 April 2015]. （原始內容存檔於2021-08-15）. 
  17. ^ 17.0 17.1 存档副本. [2015-04-01]. （原始內容存檔於2015-04-02）. 
取自 "https://zh.wikipedia.org/w/index.php?title=NodeMCU&oldid=73701995"