J have problem with this script. J have 12x DS18B20 connected to GPIO 0 and scripts not working for me can everyone help me j just wont display temperature from all ds18b20 on the webpage please help me with that.
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)
J search the internet and found this script but this one print temp only on Esplorer
-- Read temperature from all DS18B20 sensors on the OneWireBus
-- Using NodeMCU 0.9.5 build 20150106
function prinTemp ()
local pin = 3 -- use GPIO-0
local tempL, tempH, temp = 0
local power, nopower = 1, 0
ow.setup(pin)
if ow.reset(pin) == 1 then
counter = counter + 1
print("Start conversion: " .. counter)
-- Select all devices on the owbus and start conversion on all devices
-- power the bus during conversion
ow.skip(pin)
ow.write(pin, 0x44, power)
tmr.wdclr() -- keep the watchdog happy
tmr.delay(750000) -- wait max 750 msec for conversion to complete
-- start searching DS18B20 (0x28) devices only
ow.reset_search(pin)
ow.target_search(pin,0x28)
-- search the first device
local addr = ow.search(pin)
-- and loop through all devices
while addr do
tmr.wdclr()
-- print(addr:byte(1,8))
ow.reset(pin)
ow.select(pin, addr) -- select the found sensor
ow.write(pin, 0xBE, nopower) -- READ_SCRATCHPAD
-- read temperature LSB + MSB bytes from sensor
temp = ( ow.read(pin) + ow.read(pin) * 256 ) * 625
-- stop reading rest of scratchpad ram after the first 2 bytes
ow.reset(pin)
-- floating point temperature with 1 decimal
tempH = temp / 10000
tempL = ( temp % 10000 ) / 1000
-- round up 1st decimal using second decimal
round = ( temp % 1000 ) / 100
if round >= 5 then
tempL = tempL + 1
end
-- print("T=" .. tempH .. "." .. tempL .. " C - " .. temp)
print("T=" .. tempH .. "." .. tempL)
-- search next device
addr = ow.search(pin)
end
else
print("No device present on the OneWireBus.")
end
end
-- Main progrom starts here
counter = 0
-- set timer to print temperature every 10 seconds
tmr.alarm(1, 10 * 1000, 1, prinTemp )
Please Help me