Post your best Lua script examples here

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By jankop
#8060 The sensor DHT22 is really great.


Load program monDHT22.lua and dht22.lua to ESP8266 with LuaLoader
And the same for DHT11 sensor ... monDHT11.lua and dht11.lua

Code: Select all-- Demo http server for sensor DHT22 - tested with NodeMCU 0.9.5 build 20150107
-- 1. Flash NodeMCU 0.9.5 build 20150107 or later to ESP module.
-- 2. Load program monDHT22.lua and dht22.lua to ESP8266 with LuaLoader
-- 3. You can rename the program monDHT22.lua to init.lua
-- 3. HW reset module
-- 4. Login module to your AP - wifi.setmode(wifi.STATION),wifi.sta.config("yourSSID","yourPASSWORD")
-- 5. Run program monDHT22.lua - dofile(monDHT22.lua)
-- 6. Test IP address - wifi.sta.getip()
-- 7. Test it with your browser and true IP address of module.
-- 8. The sensor is repeatedly read every minute.
-- 9. The pictures on page are external.
--10. The length of html code is limited to 1460 characters.
--11. The author of the program module dht22.lua for reading DHT sensor is Javier Yanez

PIN = 4 --  data pin, GPIO2
--load DHT22 module and read sensor
function ReadDHT22()
   dht22 = require("dht22")
   t = dht22.getTemperature()
   h = dht22.getHumidity()
   print("Humidity:    "..humi.."%")
   print("Temperature: "..temp.." deg C")
   print("Temperature: "..fare.." deg F")
   -- release module
   dht22 = nil

tmr.alarm(1,60000, 1, function() ReadDHT22() bimb=bimb+1 if bimb==5 then bimb=0 wifi.sta.connect() print("Reconnect")end end)

srv=net.createServer(net.TCP) srv:listen(80,function(conn)
   --print(payload) -- for debugging only
   --generates HTML web site
    conn:send('HTTP/1.1 200 OK\r\nConnection: keep-alive\r\nCache-Control: private, no-store\r\n\r\n\
    <html><head><meta content="text/html;charset=utf-8"><title>ESP8266</title></head>\
   <body bgcolor="#ffe4c4"><h2>Hygrometer with<br>DHT22 sensor</h2>\
   <h3><font color="green">\
   <IMG SRC=""WIDTH="64"HEIGHT="64"><br>\
   <input style="text-align: center"type="text"size=4 name="j"value="'..humi..'"> % of relative humidity<br><br>\
   <IMG SRC=""WIDTH="64"HEIGHT="64"><br>\
   <input style="text-align: center"type="text"size=4 name="p"value="'..temp..'"> Temperature grade C<br>\
   <input style="text-align: center"type="text"size=4 name="p"value="'..fare..'"> Temperature grade F</font></h3>\
   <IMG SRC=""WIDTH="200"HEIGHT="230"BORDER="2"></body></html>')
    conn:on("sent",function(conn) conn:close() end)
Last edited by jankop on Sat Jan 24, 2015 1:46 pm, edited 2 times in total.