DS18B20 1-Wire digital thermometer on speaker cables

[59iosl30]

Hello!

Is it possible to use the DS18B20 in parasite power mode with approximately 25 meter speaker cables (which are already placed in the wall to the other rooms)?

Is there anything which I should consider in order to be safe?

Does anybody have experience with 1-wire bus on speaker cables?

Thank you!

[59iosl30]

Does nobody else here tried to connect the DS18B20 with speaker cables ?

[Major Tom]

I have never tried the GPIO 1-wire interface in parasitic mode. I usually use three wires- 3.3V, data and GND. But this guy seems to have it working:
https://www.mkompf.com/weather/pionewiremini.html

You could easily try it and see how you get on.

[mcummings]

I've done a fair amount of work with the one wire interface, specifically the DS18S20 (the DS18B20's predecessor) in production environments. I tried long and hard to avoid having to run power to the device and just power them parasitically using current derived from the serial port, but in the end it just wasn't reliable enough and I added my own tiny power source. What I found was that the capacity to power parasitically was entirely dependent upon the computer to which the device was connected, which makes sense actually. For my environment (hundreds of deployed devices) I could just not take the risk.

If you're just trying to make this go for a one-off situation, then I'd say you have a 50/50 chance - either it will work reliably or it won't!

Let me know if I can be of any further assistance.


Respectfully,
Marshall