Introduction: Display Temperature and Humidity on Website and OLED(D-duino)

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Last class I show the class how to use web control led at D-duino platform.

This class I will show how to use D-duino display temperature and humidity at the same time. D-duino will restart automatically every several seconds. So you can see the temperature and humidity directly from OLED. At the same time you can get this data from website.

Step 1: Prepare

D-duino x1

dht11 sensor x1

Connect dht11 VCC to D-duino 3v3 pin

Connect dht11 GND to D-duino GND pin

Connect dht11 data to D-duino 5 pin

First I think you need to burn a new version firmware to D-duino. Please refer to this http://nodemcu.readthedocs.org/en/dev/en/build/

Step 2: Code

Then open ESPlorer write 2 files into D-duino:

init.lua

<p>wifi.setmode(wifi.STATION) <br>wifi.sta.config("Your wifi name","Your wifi password")
wifi.sta.connect() 
print("Setting up WIFI...")
tmr.alarm(1, 1000, 1, function() 
if wifi.sta.getip()== nil then 
print("IP unavaiable, Waiting...") 
else 
tmr.stop(1)
print("Config done, IP is "..wifi.sta.getip())
dofile("wifidht.lua")
end 
end)</p>

wifidht.lua

<p>pin = 5 -- The pin you connected the DHTXX<br>status, temp, humi, temp_dec, humi_dec = dht.read11(pin)
bimb = 1</p><p>function init_OLED(sda,scl,sla) --Set up the u8glib lib
 i2c.setup(0, sda, scl, i2c.SLOW)
 disp = u8g.ssd1306_128x64_i2c(sla)
 disp:setFont(u8g.font_6x10)
 disp:setFontRefHeightExtendedText()
 disp:setDefaultForegroundColor()
 disp:setFontPosTop()
end
function display() 
 disp:firstPage()
 repeat
 if wifi.sta.getip()== nil then
 disp:drawStr(0,0,"Wait")
 else
 disp:drawStr(0,0,wifi.sta.getip())
 disp:drawStr(0,12,"WiFi Connected")
 disp:drawStr(0,24,"Temperature")
 disp:drawStr(0,36,"Humidity")
 disp:drawStr(70,24,temp)
 disp:drawStr(70,36,humi)
 end
 until disp:nextPage() == false 
 end
 
 
 init_OLED(1,2,0x3c)
 display()</p><p>function sendData()
dht.read11(pin)
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.."
</p> Hello Dongsen Technology <p>"; 
 buf = buf.."
</p>"; 
 buf = buf.."
Tempurature<p>"..temp;
 buf = buf.."
</p>Humidity<p>"..humi.."%";
 client:send(buf);
 client:close(); 
 collectgarbage(); 
 conn:close()
 end) 
end)
end</p><p>tmr.alarm(2, 6000, 1, function() sendData() end )</p>

You can go to my website to find more interesting thing.

Then just restart D-duino check the IP and Temperature and humidity.
Not so hard but very funny!