Sensor da Estufa V0.1

init.lua

--- Config
SSID       = "Dark side of the Force"
PASSWORD   = "senhasupersecreta"
TIMEOUT    = 30000000 -- 30s

--- Station modes
STAMODE = {
  STATION_IDLE             = 0,
  STATION_CONNECTING       = 1,
  STATION_WRONG_PASSWORD   = 2,
  STATION_NO_AP_FOUND      = 3,
  STATION_CONNECT_FAIL     = 4,
  STATION_GOT_IP           = 5
}

--- Connect to WIFI and then periodically send data to ThingSpeak.com
function connect(timeout)
  local time = tmr.now()
  wifi.sta.connect()

  -- Wait for IP address; check each 1000ms; timeout
  tmr.alarm(1, 1000, 1, 
    function() 
      if wifi.sta.status() == STAMODE.STATION_GOT_IP then 
        tmr.stop(1)
        print("Station: connected! IP: " .. wifi.sta.getip())
        tmr.alarm(0, 60000, 1, function() sendData() end )
      else
      if tmr.now() - time > timeout then
        tmr.stop(1)
        print("Timeout!")
        if wifi.sta.status() == STAMODE.STATION_IDLE
          then print("Station: idling") end
        if wifi.sta.status() == STAMODE.STATION_CONNECTING
          then print("Station: connecting") end
        if wifi.sta.status() == STAMODE.STATION_WRONG_PASSWORD
          then print("Station: wrong password") end
        if wifi.sta.status() == STAMODE.STATION_NO_AP_FOUND
          then print("Station: AP not found") end
        if wifi.sta.status() == STAMODE.STATION_CONNECT_FAIL
          then print("Station: connection failed") end
      end
    end 
  end)
end

--- Get temp
function getTemp()
  local r = adc.read(0)
  local c = r * 285 / 1024
  return c
end

function getLux()
    local l
    SDA_PIN = 6 -- sda pin, GPIO12
    SCL_PIN = 5 -- scl pin, GPIO14

    bh1750 = require("bh1750")
    bh1750.init(SDA_PIN, SCL_PIN)
    bh1750.read()
    l = bh1750.getlux()
    print("lux: "..(l / 100).."."..(l % 100).." lx")
    -- release module
    bh1750 = nil
    package.loaded["bh1750"]=nil
    return l
end

function getTempHumi()
    pin = 4
    local status,temp,humi,temp_decimial,humi_decimial = dht.read(pin)
    if( status == dht.OK ) then
    -- Float firmware using this example
      print("DHT Temperature:"..temp..";".."Humidity:"..humi)
    elseif( status == dht.ERROR_CHECKSUM ) then
      print( "DHT Checksum error." );
    elseif( status == dht.ERROR_TIMEOUT ) then
      print( "DHT Time out." );
    end
    return temp, humi
end

--- Get temp and send data to thingspeak.com
function sendData()
  local t, h = getTempHumi()
  local lux = getLux()
    
  print("Temp:"..t .." C\n")
  print("Humi:"..h .." RH\n")
  print("Lux:"..lux .." lx\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=5DL2THYRD4ZTNPH2&field1="..t.."&field2="..h.."&field3="..lux.." 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 5.1)\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


--- Main
print("Setting up Wi-Fi connection..")
wifi.setmode(wifi.STATION)
wifi.sta.config(SSID, PASSWORD)
connect(TIMEOUT)