109 lines
5.0 KiB
Markdown
109 lines
5.0 KiB
Markdown
# **NodeMCU 1.5.1** #
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[](https://gitter.im/nodemcu/nodemcu-firmware?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
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[](https://travis-ci.org/nodemcu/nodemcu-firmware)
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[](http://nodemcu.readthedocs.org/)
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[](https://github.com/nodemcu/nodemcu-firmware/blob/master/LICENSE)
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### A Lua based firmware for ESP8266 WiFi SOC
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NodeMCU is an [eLua](http://www.eluaproject.net/) based firmware for the [ESP8266 WiFi SOC from Espressif](http://espressif.com/en/products/esp8266/). The firmware is based on the [Espressif NON-OS SDK 1.5.1](http://bbs.espressif.com/viewtopic.php?f=46&p=5315) and uses a file system based on [spiffs](https://github.com/pellepl/spiffs). The code repository consists of 98.1% C-code that glues the thin Lua veneer to the SDK.
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The NodeMCU *firmware* is a companion project to the popular [NodeMCU dev kits](https://github.com/nodemcu/nodemcu-devkit-v1.0), ready-made open source development boards with ESP8266-12E chips.
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# Summary
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- Easy to program wireless node and/or access point
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- Based on Lua 5.1.4 (without *debug, os* modules)
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- Asynchronous event-driven programming model
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- 40+ built-in modules
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- Firmware available with or without floating point support (integer-only uses less memory)
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- Up-to-date documentation at [https://nodemcu.readthedocs.org](https://nodemcu.readthedocs.org)
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# Programming Model
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The NodeMCU programming model is similar to that of [Node.js](https://en.wikipedia.org/wiki/Node.js), only in Lua. It is asynchronous and event-driven. Many functions, therefore, have parameters for callback functions. To give you an idea what a NodeMCU program looks like study the short snippets below. For more extensive examples have a look at the [`/lua_examples`](lua_examples) folder in the repository on GitHub.
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```lua
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-- a simple HTTP server
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srv = net.createServer(net.TCP)
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srv:listen(80, function(conn)
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conn:on("receive", function(conn, payload)
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print(payload)
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conn:send("<h1> Hello, NodeMCU.</h1>")
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end)
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conn:on("sent", function(conn) conn:close() end)
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end)
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```
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```lua
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-- connect to WiFi access point
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wifi.setmode(wifi.STATION)
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wifi.sta.config("SSID", "password")
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```
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# Documentation
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The entire [NodeMCU documentation](https://nodemcu.readthedocs.org) is maintained right in this repository at [/docs](docs). The fact that the API documentation is mainted in the same repository as the code that *provides* the API ensures consistency between the two. With every commit the documentation is rebuilt by Read the Docs and thus transformed from terse Markdown into a nicely browsable HTML site at [https://nodemcu.readthedocs.org](https://nodemcu.readthedocs.org).
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- How to [build the firmware](https://nodemcu.readthedocs.org/en/dev/en/build/)
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- How to [flash the firmware](https://nodemcu.readthedocs.org/en/dev/en/flash/)
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- How to [upload code and NodeMCU IDEs](https://nodemcu.readthedocs.org/en/dev/en/upload/)
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- API documentation for every module
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# Support
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See [https://nodemcu.readthedocs.org/en/dev/en/support/](https://nodemcu.readthedocs.org/en/dev/en/support/).
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# License
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[MIT](https://github.com/nodemcu/nodemcu-firmware/blob/master/LICENSE) © [zeroday](https://github.com/NodeMCU)/[nodemcu.com](http://nodemcu.com/index_en.html)
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# Build Options
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The following sections explain some of the options you have if you want to [build your own NodeMCU firmware](http://nodemcu.readthedocs.org/en/dev/en/build/).
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### Select Modules
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Disable modules you won't be using to reduce firmware size and free up some RAM. The ESP8266 is quite limited in available RAM and running out of memory can cause a system panic. The default configuration is designed to run on all ESP modules including the 512 KB modules like ESP-01 and only includes general purpose interface modules which require at most two GPIO pins.
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Edit `app/include/user_modules.h` and comment-out the `#define` statement for modules you don't need. Example:
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```c
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...
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#define LUA_USE_MODULES_MQTT
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// #define LUA_USE_MODULES_COAP
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// #define LUA_USE_MODULES_U8G
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...
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```
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### Tag Your Build
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Identify your firmware builds by editing `app/include/user_version.h`
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```c
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#define NODE_VERSION "NodeMCU 1.5.1+myname"
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#ifndef BUILD_DATE
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#define BUILD_DATE "YYYYMMDD"
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#endif
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```
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### Set UART Bit Rate
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The initial baud rate at boot time is 115200bps. You can change this by
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editing `BIT_RATE_DEFAULT` in `app/include/user_config.h`:
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```c
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#define BIT_RATE_DEFAULT BIT_RATE_115200
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```
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Note that, by default, the firmware runs an auto-baudrate detection algorithm so that typing a few characters at boot time will cause
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the firmware to lock onto that baud rate (between 1200 and 230400).
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### Debugging
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To enable runtime debug messages to serial console edit `app/include/user_config.h`
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```c
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#define DEVELOP_VERSION
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```
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