- Thu Jul 09, 2015 4:44 am
#22821
Hi I have a problem with displaying the values of the sensors DS18B20 on the website you want to connect 6 sensors to one port DS18B20 gpio how I do device does not respond as connection of 2 sensors the device to pin gpio0 appear on the page two values and it works but, as already connection of more than two device stops responding below please find the code can someone help me in this topic please ...
Please Help.
Code: Select all
pin = 3
ow.setup(pin)
counter=0
temps={}
function bxor(a,b)
local r = 0
for i = 0, 31 do
if ( a % 2 + b % 2 == 1 ) then
r = r + 2^i
end
a = a / 2
b = b / 2
end
return r
end
function getTemp()
addr = ow.reset_search(pin)
repeat
tmr.wdclr()
if (addr ~= nil) then
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
sensor = ""
for j = 1,8 do sensor = sensor .. string.format("%02x", addr:byte(j)) end
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)
data = nil
data = string.char(ow.read(pin))
for i = 1, 8 do
data = data .. string.char(ow.read(pin))
end
crc = ow.crc8(string.sub(data,1,8))
if (crc == data:byte(9)) then
t = (data:byte(1) + data:byte(2) * 256)
if (t > 32768) then
t = (bxor(t, 0xffff)) + 1
t = (-1) * t
end
t = t * 625
if(addr:byte(1) == 0x10) then
-- we have DS18S20, the measurement must change
t = t * 8; -- compensating for the 9-bit resolution only
t = t - 2500 + ((10000 * (data:byte(8) - data:byte(7))) / data:byte(8))
end
temps[sensor] = t
print(sensor .. ": " .. t)
end
tmr.wdclr()
end
end
end
addr = ow.search(pin)
until(addr == nil)
end
srv=net.createServer(net.TCP)
srv:listen(80,function(conn)
getTemp()
fff = wifi.sta.getmac() .. "\n"
for sensorID, temperature in pairs(temps) do
t1 = temperature / 10000
t2 = (temperature >= 0 and temperature % 10000) or (10000 - temperature % 10000)
headers = "HTTP/1.0 200 OK\nContent-Type: text/html\nConnection:close\n"
result = t1 .. "." .. string.format("%04d", t2)
headers = headers .. "Content-Length:".. string.len(result) .."\r\n\r\n"
output = headers .. result
end
conn:send(output)
conn:on("sent",function(conn) conn:close() end)
end)
Please Help.
