id = 0
pin = 7
gpio.mode(7, gpio.OUTPUT)

print("webapp running @ ip\n")

function sendData()
-- connection 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')
-- 0V <= Vadc value <= 3.03V
ADC_value = (adc.read(0)*3030)/1024;  
print("Sending data to thingspeak.com, ADC value:"..ADC_value.."mV")
conn:send("GET /update?key=99UMWAO1LLNVI7TR&field1="..ADC_value.." 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...\n")
  end)
end

-- send data every 60 000 ms to thing speak
tmr.alarm(0, 60000, 1, function() sendData() end )