Simple wifi web server - hygrometer with DHT22 sensor
Posted: Sat Jan 24, 2015 3:55 amThe 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
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
--wifi.setmode(wifi.STATION)
--wifi.sta.config("yourSSID","yourPASSWORD")
tmr.delay(1000000)
humi="XX"
temp="XX"
fare="XX"
bimb=1
PIN = 4 -- data pin, GPIO2
--load DHT22 module and read sensor
function ReadDHT22()
dht22 = require("dht22")
dht22.read(PIN)
t = dht22.getTemperature()
h = dht22.getHumidity()
humi=(h/10).."."..(h%10)
temp=(t/10).."."..(t%10)
fare=(9*t/50+32).."."..(9*t/5%10)
print("Humidity: "..humi.."%")
print("Temperature: "..temp.." deg C")
print("Temperature: "..fare.." deg F")
-- release module
dht22 = nil
package.loaded["dht22"]=nil
end
ReadDHT22()
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)
conn:on("receive",function(conn,payload)
--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\
<!DOCTYPE HTML>\
<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="http://esp8266.fancon.cz/common/hyg.gif"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="http://esp8266.fancon.cz/common/tmp.gif"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="http://esp8266.fancon.cz/common/dht22.gif"WIDTH="200"HEIGHT="230"BORDER="2"></body></html>')
conn:on("sent",function(conn) conn:close() end)
end)
end)