ESP8266 Community Forum

init.lua

wifi.setmode(wifi.STATION)
wifi.sta.config("SSID","password")
print(wifi.sta.getip())
tmr.alarm(0, 60000, 1, function() dofile("speak.lua") end )

speak.lua

conn=net.createConnection(net.TCP, 0)
conn:on("receive", function(conn, payload) print(payload) end)
conn:connect(80,'184.106.153.149')
conn:send("GET /update?key=yourKEY&field1=16 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")

send temperature to thingspeak.com from BS18B20



speak.lua


pin = 9
ow.setup(pin)
count = 0
repeat
count = count + 1
addr = ow.reset_search(pin)
addr = ow.search(pin)
tmr.wdclr()
until((addr ~= nil) or (count > 100))
if (addr == nil) then
print("No more addresses.")
else
print(addr:byte(1,8))
crc = ow.crc8(string.sub(addr,1,7))
if (crc == addr:byte(8)) then
if ((addr:byte(1) == 0x10) or (addr:byte(1) == 0x28)) then
print("Device is a DS18S20 family device.")
--repeat
ow.reset(pin)
ow.select(pin, addr)
ow.write(pin, 0x44, 1)
tmr.delay(1000000)
present = ow.reset(pin)
ow.select(pin, addr)
ow.write(pin,0xBE,1)
print("P="..present)
data = nil
data = string.char(ow.read(pin))
for i = 1, 8 do
data = data .. string.char(ow.read(pin))
end
print(data:byte(1,9))
crc = ow.crc8(string.sub(data,1,8))
print("CRC="..crc)
if (crc == data:byte(9)) then
t = (data:byte(1) + data:byte(2) * 256) * 625
t1 = t / 1000
t2 = t % 1000
print("Temperature= "..t1.."."..t2.." Centigrade")

end
tmr.wdclr()
--until false
else
print("Device family is not recognized.")
end
else
print("CRC is not valid!")
end
end



conn=net.createConnection(net.TCP, 0)
conn:on("receive", function(conn, payload) print(payload) end)
conn:connect(80,'184.106.153.149')
conn:send("GET /update?key=Yourey&field1="..t1.."."..t2.." 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")

Thank U, now all works great !!!
For stable work i moved a thingspeak code after t2 = t % 1000, and changed t1 = t / 1000 to t1 = t / 10000 for correct centigrade display. Maybe this helps to someone.

Error when hit negative temperature...