nodemcu led blink lua script nodemcu ESP12E

blink.lua

-- Blink using timer alarm --
timerId = 0
dly = 1000
-- use D4
ledPin = 4
-- set mode to output
gpio.mode(ledPin,gpio.OUTPUT)
ledState = 0
-- timer loop
tmr.alarm( timerId, dly, 1, function()
  ledState = 1 - ledState;
  -- write state to D4
  gpio.write(ledPin, ledState)
  print("Hello")
end) 

click-to-on.lua

wifi.setmode(wifi.SOFTAP)
wifi.ap.config({ssid="test",pwd="12345678"})
gpio.mode(1, gpio.OUTPUT)
srv=net.createServer(net.TCP)
srv:listen(80,function(conn)
    conn:on("receive", function(client,request)
        local buf = ""
        local _, _, method, path, vars = string.find(request, "([A-Z]+) (.+)?(.+) HTTP")
        if(method == nil)then
            _, _, method, path = string.find(request, "([A-Z]+) (.+) HTTP")
        end
        local _GET = {}
        if (vars ~= nil)then
            for k, v in string.gmatch(vars, "(%w+)=(%w+)&*") do
                _GET[k] = v
            end
        end
        buf = buf.."<h1> Hello, NodeMcu.</h1><form src=\"/\">Turn PIN1 <select name=\"pin\" onchange=\"form.submit()\">"
        local _on,_off = "",""
        if(_GET.pin == "ON")then
              _on = " selected=true"
              gpio.write(1, gpio.HIGH)
        elseif(_GET.pin == "OFF")then
              _off = " selected=\"true\""
              gpio.write(1, gpio.LOW)
        end
        buf = buf.."<option".._on..">ON</opton><option".._off..">OFF</option></select></form>"
        client:send(buf)
    end)
    conn:on("sent", function (c) c:close() end)
end)

flash-firmware-nodemcu.md

Install node flasher

• apt-get install python3-pip
• pip3 install -U -f https://extras.wxpython.org/wxPython4/extras/linux/gtk3/ubuntu-16.04 wxPython
• pip3 install esptool
• git clone https://github.com/marcelstoer/nodemcu-pyflasher
• cd /nodemcu-pyflasher && python3 nodemcu-pyflasher.py
• Generate a build and build will be delivered tto email download and burn https://nodemcu-build.com/trigger-build.php
• Nodemcu devkit and pin details can be found here https://github.com/nodemcu/nodemcu-devkit-v1.0

init.lua

wifi.setmode(wifi.STATION)
wifi.sta.config("xxxx", "xxxxxx")
-- register event callbacks for WiFi events
wifi.sta.eventMonReg(wifi.STA_CONNECTING, function(previous_state)
    if(previous_state==wifi.STA_GOTIP) then 
        print("Station lost connection with access point. Attempting to reconnect...")
    else
        print("STATION_CONNECTING")
    end
end)
print(wifi.sta.getip())
dofile("blink.lua")

server.lua

srv=net.createServer(net.TCP,3) 
srv:listen(80,function(conn) 
    conn:on("receive",function(conn,payload) 
    print(payload) 
    conn:send("<h1> Hello, NodeMcu.</h1>")
    end)
    conn:on("sent", function (c) c:close() end) --close the socket after succesfully flushed data
end)

troubleshooting.md

• Connect the nodemcu to backside of the cpu. Front panel is completely flicky.
• Once connected Open ESPlorer as root or add the current user to dialout group using sudo usermod -a -G dialout $USER . After this no more need to launch as usod. Please logout and login for the change to effect.
• Select /dev/ttyUSBx and click open.
• Click the rest button in nodemcu.
• send =node.heap() and wait for sometime. Send the same command again if you get garbage output till you get the right numbers. ** use nodemcu uploader which stable and better than ESPLorer
• Also set the baud rate to 115200bps ( 921600bps never workes 115200bps worked better) . Latest firmware changed the default baud rate to 115200bps so use that.
• ESPlorer for some reason not uploading the files correctly.
• https://github.com/kmpm/nodemcu-uploader install it pip install nodemcu-uploader
• nodemcu-uploader upload init.lua
• Whatever put under print() will can be monitored through terminal port. use nodemcu-uploader terminal You should see whatever print statements you have put in terminal port. Also you can send data simultaneously. l = file.list(); for k,v in pairs(l) do print("name:"..k..", size:"..v) end paste this to get the list of files.
• use cutecom apt-get install cutecom which has seperate window for read and write which will decluter.
• Find the port of the nodemcu . Usually it will under ls -l /dev/ttyUSB*
• In the device drop down paste the terminal /dev/ttyUSB0
• Make sure you are connection 2.4Ghz SSID not the 5GHZ because nodemcu only supports 2.4Ghz
• Install this vscode plugin https://github.com/fduman/vscode-nodemcu which will make life easier.