Category:NodeMCU

Upload Sketch

For nodemcu to upload sketch (old)

• Use script interpreter LUA as embedded system programming
• open Nodemcu flasher/esp download tool/esptool.py to upload this firmware, more details see here, see some guidelines here
  
• Restart module and upload lua scripts: LEDBlink.lua, init.lua, mqtt2.lua

Quick Start Guide for Lua

• If you prefer to use lua script, you can download 2015 stable firmware version here.
• Or find the latest release on nodemcu github here.
• IDE can use lualoader (here is 0.91 version) or esplorer.
• Send commands, = node.chipid() to get chip ID, or = node.heap() to test.

• A few more pre-build firmware can be found here

Quick Start

Testing (LUA commands)

• Connect the board and run node.restart() commands to see the reboot info

NodeMCU 0.9.6 build 20150406  powered by Lua 5.1.4
lua: cannot open init.lua

• Using any Serial tool, send interactive commands, should have following reply:

print("hello world")

Startup lua file init.lua

• New flashed board has no any script inside
• when module bootup successfully, it will run lua code file init.lua in default
• if we want to run a custom lua code file, we can add dofile("yourfile.lua") into init.lua to let the board do so
• example code hello world

 file.open("init.lua","w+")
 file.writeline([[print("hello world")]])
 file.writeline([[dofile("yourfile.lua")]])
 file.close()

• 

  lua：cannot open init.lua

• 

  add code to init.lua

• 

  running hello world

Relevant Topics

Doc page

• NodeMCU Docs

Git page

• Offcial NodeMCU github
• NodeMCU Github page

Hardware page

• ESP8266 NodeMCU Dev Board

Firmware build

• Use ESP Open SDK to build nodemcu - ESP8266 Open SDK
• NodeMCU dev custom firmware online build

Documents

• ESP8266 NodeMCU Lua

Modules

• Third party DHT22 modules: https://github.com/javieryanez/nodemcu-modules/tree/master/dht22

Useful link

• Nodemcu github page
• Nodemcu firmware release (0.96 currently)
• ESPlorer GUI
• Windows flash tool - nodeMCU flasher

Obselete

• Updated info can be found at bbs.nodemcu.com

Module and library

• U8G - display 128x64 OLED, example lua in nodemcu folder "nodemcu-firmware/lua_examples/u8glib/u8g_graphics_test.lua"
• DHT22 - example avaialble