/iot

Primary LanguageLua

Nodemcu sketches

GY-68 module - BMP180 sensor

dofile("bmp180.lua").help()
bmp = dofile("bmp180.lua")
isok = bmp.init(sda, scl, oss)
{temp, pa, hgmm, alt} = bmp.read()

GY-273 module - HMC5883L sensor

dofile("hmc5883l.lua").help()
hmc = dofile("hmc5883l.lua")
isok = hmc.init(sda, scl)
{x, y, z} = hmc.read()

Trigonometry module - software realization of basic functions

tg = dofile("trigonometry.lua")
val = tg.tan(rad)
val = tg.sin(rad)
val = tg.cos(rad)
rad = tg.atan(x)
rad = tg.atan2(y, x)
rad = tg.asin(x)
rad = tg.acos(x)
deg = tg.deg(rad)
rad = tg.rad(deg)
pi = tg.pi

Shell module - simple command-line interface via Telnet connection

dofile("shell.lua")

Supported commands:

  • ls - lists files stored on flash with their size
  • df - provides summary for file system
  • cat FILENAME - prints contents of file FILENAME
  • head FILENAME [NUMLINES] - prints first NUMLINES lines (default is 10) of file FILENAME
  • tail FILENAME [NUMLINES] - prints last NUMLINES lines (default is 10) of file FILENAME
  • mv SRC DEST - renames file SRC to DEST (rewrite of existing file is forbidden)
  • cp SRC DEST - creates a copy of file SRC as DEST (rewrite of existing file is forbidden)
  • rm FILENAME - removes file FILENAME
  • grep REGEXP [FILENAME] - searches lua-style REGEXP pattern in file FILENAME (FILENAME supports wildcards and defaults to *)
  • whoami - shows device params (ip settings, MAC address, NodeMCU version, chip id, flash size)
  • iw CMD [ARG1 [ARG2]] - Wi-Fi tool. 'scan' as CMD starts AP search (iw scan). 'connect' as CMD tries to connect to AP (iw connect ssid password).
  • luac FILENAME - compiles .lua source file into .lc file
  • reboot - reboots device
  • ed [FILENAME] - ed text editor ( Q<return> to leave :) - get a cheatsheet if you don't know it good enough )
  • passwd [USERNAME] - changes passwords, adds (when selecting unexistent user) and deletes (when setting empty password) users.

Tips:

  • port is default for Telnet server: 23
  • number in the prompt shows available heap
  • server is written with coroutines - it is the only working way for me to eliminate nasty memory leak with server example from docs
  • use only needed plugins - now it has one file for one command and you can see all supported commands by ls (if you have ls plugin installed)

Wget module - HTTP/HTTPS file downloader

dofile("wget.lua").wget("https://example.com/path/target.file")
dofile("wget.lua").wget("https://example.com/path/target.file", "dest.file")