search

bcl / digitemp

1-wire temperature sensor cmdline interface
GNU General Public License v2.0
37 stars 24 forks source link

Can digitemp tell me the value of the "Read Power Supply [B4h]" command? #29

Closed jaimet closed 4 years ago

jaimet commented 4 years ago

Hi.

The DS18B20 datasheet makes several references to a "Read Power Supply [B4h]" command which can be used "to determine if any DS18B20s on the bus are using parasite power." (instead of, presumably, external power via Vdd).

Is there any way that I can get this information, for a given sensor, via digitemp?

(Thank you for writing digitemp, by the way - it's much appreciated. I've just built my first 1-wire network out of a CP2102, a couple of old cat5 patch leads and two DS18B20 digital thermometers, and it's working perfectly!)

Jaime

bcl commented 4 years ago

No, digitemp doesn't support that command. It's possible to add it, but then you have to add a way to display it that fits with the rest of the outputs. Normally I know if my 1-wire network is passive or not, and it's unusual to have individual sensors using different power modes.