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NodeMCU LUA

☘ Arduino free ☘

  • Install CH340 driver
  • Receive Firmware (*.bin) from nodemcu-build.com to email. Modules: file,gpio,http,mdns,net,node,pwm,pwm2,tmr,uart,websocket,wifi,tls
pip3 install esptool
pip3 install nodemcu-uploader
pip3 install --upgrade pyserial --user
  • Connect NodeMCU->USB->Mac. Flash nodemcu (replace port "/dev/cu.usbserial-1410" with your port *1)
esptool.py --port /dev/cu.usbserial-1410 erase_flash
esptool.py --port /dev/cu.usbserial-1410 write_flash --flash_size=detect 0 nodemcu.bin
  • Replace "wifissd", "wifipas" in init.lua and upload to nodemcu
nodemcu-uploader -p /dev/cu.usbserial-1410 upload init.lua
nodemcu-uploader node restart
  • Try blink "d4" pin 100 times at 10Hz
http:https://nodemcu/?hz=10&d4=100s
  • Use Sublime: Tools -> Build system -> New build system
{
	"shell_cmd": "nodemcu-uploader --port /dev/cu.usbserial-1410 upload $file_name && nodemcu-uploader --port /dev/cu.usbserial-1410 file do $file_name"
}

more

LUA tips

Deep sleep = shutdown + delay 5sec + start with init.lua. Connect RST and D0 pins

node.dsleep(5000000)

Use timer 5 sec.

tmr.create():alarm(5000, tmr.ALARM_SINGLE, function()
print("hello world!")
end)

Eval

loadstring("print(15)")()

HTTP GET (Doesn't work at startup, needs a timer):

uri = "https://www.google.com/search?q=nodemcu"
host = (uri.."/"):match(":https://(.-)/")
path = uri:match(":https://.-%f[/%z](/.*)")
srv = tls.createConnection()
srv:on("receive", function(sck, c) print(c:match("\r\n\r\n(.*)")) srv:close() end)
srv:on("connection", function(sck, c) sck:send("GET "..path.." HTTP/1.1\nHost: "..host.."\n\n") end)
srv:connect(443,host)

Servo (replace 40 to 30...140 for sg90 - just connect it to G,3V,D4 pins):

pin=4 pwm.setup(pin,50,0) pwm.setduty(pin, 40) tmr.delay(600000) pwm.stop(pin)

Notes

*1 - View ports on MacOS:

ls /dev/

*2 - file list

nodemcu-uploader --port /dev/cu.usbserial-1410 file list