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ESP8266 and Air Quality sensor

ESP8266 hooked up to the cloud feeding data from an Air Quality sensor sniffing for VOC ... with astonishing results! #SENSableTHING

IntermediateWork in progress7,587
ESP8266 and Air Quality sensor

Things used in this project

Hardware components

Everything ESP ESP8266 SMT Module - ESP-12
×1
FTDI 3.3V
×1
Seeed Air Quality Sensor 1.2
×1

Software apps and online services

Arduino IDE
Arduino IDE

Story

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Schematics

ESP8266_w2.jpg

Esp8266 w2

Code

init.lua

Lua
init script will be started by autostart of nodemcu, scripted in LUA language, change the SSID and passkey according to your Wifi AP, uncomment dofile ("web.lua") if you want to autostart web.lua or the thing.lua script
print('init.lua ver 1.2')
wifi.setmode(wifi.STATION)
print('set mode=STATION (mode='..wifi.getmode()..')')
print('MAC: ',wifi.sta.getmac())
print('chip: ',node.chipid())
print('heap: ',node.heap())
-- wifi config start
wifi.sta.config("SSID","passkey")
-- wifi config end
wifi.sta.connect()
 tmr.alarm(1, 1000, 1, function()
  if wifi.sta.getip()== nil then
  print("IP unavaiable, Waiting...")
 else
  tmr.stop(1)
 print("ESP8266 mode is: " .. wifi.getmode())
 print("The module MAC address is: " .. wifi.ap.getmac())
 print("Config done, IP is "..wifi.sta.getip())
 -- dofile ("thing.lua")
 end
end)

thing.lua

Lua
sending analog sensor data to ThingSpeak cloud for visualization, replace YOURWRITEKEY with your ThingSpeak write key
port = 80

function sendData()

t1=adc.read(0)
print("VOC:"..t1.." C\n")

-- conection to thingspeak.com
print("Sending data to thingspeak.com")
conn=net.createConnection(net.TCP, 0) 
conn:on("receive", function(conn, payload) print(payload) end)
-- api.thingspeak.com 184.106.153.149
conn:connect(80,'184.106.153.149') 
conn:send("GET /update?key=YOURWRITEKEY&field1="..t1.." HTTP/1.1\r\n") 
conn:send("Host: api.thingspeak.com\r\n") 
conn:send("Accept: */*\r\n") 
conn:send("User-Agent: Mozilla/4.0 (compatible; esp8266 Lua; Windows NT 5.)\r\n")
conn:send("\r\n")
conn:on("sent",function(conn)
                      print("Closing connection")
                      conn:close()
                  end)
conn:on("disconnection", function(conn)
          print("Got disconnection...")
  end)
end

-- send data every X ms to thing speak
tmr.alarm(0, 10000, 1, function() sendData() end )

Credits

fab-lab.eu

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