- Tue May 26, 2015 10:27 am
#18511
I have found this code somewhere arround the web, but now I don't know where it was
You have to put these 3 files on you ESP:
ds18b20.lua (this is a library available on the nodeMCU github, I think)
Code: Select all--------------------------------------------------------------------------------
-- DS18B20 one wire module for NODEMCU
-- NODEMCU TEAM
-- LICENCE: http://opensource.org/licenses/MIT
-- Vowstar <vowstar@nodemcu.com>
-- 2015/02/14 sza2 <sza2trash@gmail.com> Fix for negative values
--------------------------------------------------------------------------------
-- Set module name as parameter of require
local modname = ...
local M = {}
_G[modname] = M
--------------------------------------------------------------------------------
-- Local used variables
--------------------------------------------------------------------------------
-- DS18B20 dq pin
local pin = nil
-- DS18B20 default pin
local defaultPin = 9
--------------------------------------------------------------------------------
-- Local used modules
--------------------------------------------------------------------------------
-- Table module
local table = table
-- String module
local string = string
-- One wire module
local ow = ow
-- Timer module
local tmr = tmr
-- Limited to local environment
setfenv(1,M)
--------------------------------------------------------------------------------
-- Implementation
--------------------------------------------------------------------------------
C = 0
F = 1
K = 2
function setup(dq)
pin = dq
if(pin == nil) then
pin = defaultPin
end
ow.setup(pin)
end
function addrs()
setup(pin)
tbl = {}
ow.reset_search(pin)
repeat
addr = ow.search(pin)
if(addr ~= nil) then
table.insert(tbl, addr)
end
tmr.wdclr()
until (addr == nil)
ow.reset_search(pin)
return tbl
end
function readNumber(addr, unit)
result = nil
setup(pin)
flag = false
if(addr == nil) then
ow.reset_search(pin)
count = 0
repeat
count = count + 1
addr = ow.search(pin)
tmr.wdclr()
until((addr ~= nil) or (count > 100))
ow.reset_search(pin)
end
if(addr == nil) then
return result
end
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.")
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)
if (t > 32767) then
t = t - 65536
end
if(unit == nil or unit == C) then
t = t * 625
elseif(unit == F) then
t = t * 1125 + 320000
elseif(unit == K) then
t = t * 625 + 2731500
else
return nil
end
t = t / 10000
-- print("Temperature="..t1.."."..t2.." Centigrade")
-- result = t1.."."..t2
return t
end
tmr.wdclr()
else
-- print("Device family is not recognized.")
end
else
-- print("CRC is not valid!")
end
return result
end
function read(addr, unit)
t = readNumber(addr, unit)
if (t == nil) then
return nil
else
return t
end
end
-- Return module table
return M
dallas.luaCode: Select allrequire('ds18b20')
port = 80
-- ESP-01 GPIO Mapping
gpio0 = 3
ds18b20.setup(gpio0)
function sendData()
t1=ds18b20.read()
t1=ds18b20.read()
print("Temp:"..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=THINGSPEAKKEY&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 5.1)\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
-- send data every X ms to thing speak
tmr.alarm(0, 900000, 1, function() sendData() end )
srv=net.createServer(net.TCP)
srv:listen(port,
function(conn)
conn:send("HTTP/1.1 200 OK\nContent-Type: text/html\nRefresh: 5\n\n" ..
"<!DOCTYPE HTML>" ..
"<html><body>" ..
"<b>ESP8266</b></br>" ..
"Temperature : " .. ds18b20.read() .. "<br>" ..
"Node ChipID : " .. node.chipid() .. "<br>" ..
"Node MAC : " .. wifi.sta.getmac() .. "<br>" ..
"Node Heap : " .. node.heap() .. "<br>" ..
"Timer Ticks : " .. tmr.now() .. "<br>" ..
"</html></body>")
conn:on("sent",function(conn) conn:close() end)
end)
(dont forget to change THINGSPEAKKEY to yours)
init.luaCode: Select allprint(wifi.sta.getip())
wifi.setmode(wifi.STATION)
wifi.sta.config("WiFiSSID","WiFiPassword")
print(wifi.sta.getip())
dofile('dallas.lua')
