DS18B20 Temperature Sensor

[Airmonkdev]

Hi,
is it possible to add the DS18B20 Temperature Sensor to the supported device?
I'd really appreciate.

Regards and keep up the great work,
Marco

[uli-rpi]

See Dallas Sensor

https://esphome.io/components/sensor/dallas.html?highlight=ds18b20

[Airmonkdev]

Hi,
thanks for response! COuld you please help me understand better?
I'd like to have the possibility to connect a DS18B20 to my remote Raspberry and get a new exposed temperature device on my Homebridge like what can we do with DHT sensors.

[ebaauw]

I think it should be possible, but the setup is somewhat elaborate. I don't have such sensor myself, but it seems it's exposed over 1-wire using a system file.

Can you confirm that you can get to work the Python example to read the DS18B20 from https://abyz.me.uk/rpi/pigpio/examples.html? Could you please list the contents of /sys/bus/w1/devices/28*/w1_slave?

[Airmonkdev]

Hi Ebaauw,
thanks for reply!
The output of the command "ls /sys/bus/w1/devices/28*/w1_slave" is:
/sys/bus/w1/devices/28-011581d14bff/w1_slave

I'm trying to run the Python example you point me but it seems it stuck while connecting to remote Rapy (pi = pigpio.pi()) with both env variable configured with the remote ip address and ip as parameter of pi() function.

Sound strange because I was able to create a contact sensor and it works fine, I can see my door opened and closed on my iPhone :)

[ebaauw]

Make sure you run pidpiod with -l so it accepts remote connections. Unless you specify 127.0.0.1 explicitly, it somehow sees localhost as a remote connection as well, due to some weird IPv4/IPv6 address conversion. Check with pigs hwver that pigpiod is running and accessible from another host (using the PIGPIO_ADDR environment variable).

What's the contents of the file (cat /sys/bus/w1/devices/28*/w1_slave or, if it contains non-printable characters, od -c /sys/bus/w1/devices/28*/w1_slave

[Airmonkdev]

Hi, I found my issue and now I'm able to read the temperature with the python script:
the first issue I had was file access and I solved adding the line "/sys/bus/w1/devices/28-/w1_slave r" on file "/opt/pigpio/access" on my remote Raspy.
After that I also had to modify little bit the Pythion script because it was listing the wrong files so now it is fine with pi.file_list("/sys/bus/w1/devices/**28-/**w1_slave").
Other than that I just had to add some .decode() on the data returned, here there is the working script:
DS18B20-1.zip
... the output of the script is this (every 3sec):
28-011581d14bff 21.1
28-011581d14bff 21.1
28-011581d14bff 21.1
....

And here there is the output of the command "cat /sys/bus/w1/devices/28*/w1_slave":
51 01 4b 46 7f ff 0c 10 ab : crc=ab YES
51 01 4b 46 7f ff 0c 10 ab t=21062

Thanks for your time!