How to use DS18B20?

[André Fiúza]

Hi,

I have WebiOPi 0.6, and i liked to use this chip to show temperature in webpage.

But i don't know make this.

Someone help me? 

[trouch]

this is very simple

in /etc/webiopi/config you have a [DEVICES] section

add your sensor here

for example :

[DEVICES]

mysensor = DS18B20

save, stop and restart webiopi, then open your browser to webiopi on your pi and select the devices monitor.

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[André Fiúza]

I tryed, but when i define tempx = DS18B20 in config file, i go  webpage and not open, show me error.

[Robert More]

Is it wired like this?

http://autorpi.com/content.php?20-Webiopi-and-DS18B20

[André Fiúza]

Yes but when i define temp2 = DS18B20 in config file and try access to webiopi page show me error. Like this:

http://imageshack.us/a/img560/4303/img20130415210526.jpg

But when i define temp3 = DS18B20 slave:28-0000049bc218, i can access to webiopi page but not show me temperature, and put DS18B20 correctly.

http://imageshack.us/a/img195/5526/img20130415210238.jpg

Any solution?

[André Fiúza]

And when i define in python script, show me this in terminal:

http://img96.imageshack.us/img96/8954/img20130413214633.jpg

My script:

from webiopi.devices.sensor import DS18B20
tmp = DS18B20()

[trouch]

what the result of

sudo cat /sys/bus/w1/devices/w1_bus_master1/w1_master_slaves

it should give you 1-Wire devices detected

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[trouch]

the slave address you used is the unique address of one my sensor.

your sensors will have different addresses.

but when you don't set any slave, webiopi take the first slave found depending on the class.

may be your sensor is not a DS18B20 ?

see https://code.google.com/p/webiopi/wiki/OneWireTemp

[André Fiúza]

Thanks for information trouch.

I check and i have in really DS1820 and address is 10-00080289a21e.

when webiopi has defined the DS18B20 device, but is not exist, when i access the page gives error?
It seems that is what is wrong with me!

but just gives error if no device in reality?

Sorry i am new at this.

[Robert More]

10-00080289a21e Is not a DS18B20 probably a different Dallas temp sensor number.  DS1820, DS1822 etc.

[trouch]

Use DS18S20

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