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--- talks:nodemcu-esp8266 [16/06/2016 13:15]
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+++ talks:nodemcu-esp8266 [16/06/2016 17:18] (versione attuale)
alez
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 ====== NodeMcu (ESP8266) ======
-Step-by-step guide to the first example.
+** To be upgraded with future knowledge **
+This module implements an ESP8266MOD that is Wifi hardware + microcontroller with flash memory + USB-uart interface (serial port) + GPIO lines.
+Its firmware is 3-layered:
+  * Bootloader
+  * Base Firmware: interprets user code and interfaces with hardware
+  * User code in LUA language
+For the moment, we don't know how to install user code in memory and IF and HOW it would be possible to rewrite the whole firmware to user's needs.
+===== Step-by-step guide to get the first example working. =====
+  - Compile the firmware
+  - Upload the firmware
+  - Connect to the serial terminal
+  - Write and test an example code: connect to an existing WiFi network and start a simple HTTP server
+==== 1. compile the firmware ====
+( [[http://nodemcu.readthedocs.io/en/dev/en/build/]] )
+We used the cloud building service at [[http://nodemcu-build.com/]].
+Once built an email will notify you and you can download the image ready to be uploaded in the nodemcu .
+==== 2. upload the firmware ====
+( [[http://nodemcu.readthedocs.io/en/dev/en/flash/]] )
+Download esptool.py and the needed requirements (python and python-serial module) from [[https://github.com/themadinventor/esptool|here]] .
+If your module is cheap it should be 512kB version so run:
+''esptool.py --port <USB-port-with-ESP8266> write_flash -fm qio -fs 4m 0x00000 <nodemcu-firmware>.bin''.
+==== 3. Connect to the serial terminal ====
+Open your preferred terminal (i just prefer [[http://cutecom.sourceforge.net/|cutecom]]) and set the serial port (like /dev/ttyUSB0) to 115200 baud 8n1.
+Reset the device and it should write something like:
+<code>
+NodeMCU custom build by frightanic.com
+\0x09branch: master
+\0x09commit: cdaf6344457ae427d8c06ac28a645047f9e0f588
+\0x09SSL: false
+\0x09modules: file,gpio,http,net,node,ow,tmr,uart,wifi
+ build \0x09built on: 2016-06-07 19:06
+ powered by Lua 5.1.4 on SDK 1.5.1(e67da894)
+lua: cannot open init.lua
+>
+</code>
+That ''>'' means it is ready to accept and interpret LUA code in console mode.
+==== 4. Write and test an example code ====
+( [[http://nodemcu.com/]] , [[https://nodemcu.readthedocs.io]] , [[https://github.com/nodemcu/nodemcu-firmware]] )
+=== 4.1. connect to an existing WiFi network ===
+To set the wifi module in client mode enter(+return):
+<code>
+wifi.setmode(wifi.STATION)
+</code>
+To list the wifi networks enter all the following lines and wait a little while after the last:
+<code>
+function listap(t)
+    for k,v in pairs(t) do
+        print(k.." : "..v)
+    end
+end
+wifi.sta.getap(listap)
+</code>
+To join a wifi network enter:
+<code>
+wifi.sta.config("SSID", "password")
+</code>
+To check if it has joined and the IP obtained from the DHCP server:
+<code>
+print (wifi.sta.getip())
+</code>
+=== 4.2. start a simple HTTP server ===
+<code>
+srv = net.createServer(net.TCP)
+srv:listen(80, function(conn)
+    conn:on("receive", function(sck, payload)
+        print(payload)
+        sck:send("HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n<h1> Hello folks this is NodeMCU!</h1>")
+    end)
+    conn:on("sent", function(sck) sck:close() end)
+end)
+</code>

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