Hi Jim, Direct 1-wire management using GPIO for me has two flaws : - the first one is it is exposing directory you CPU to external ESD ... and facing numerous storms last summer with close lightning, I'm very happy for not using direct connection :) - the second one is 1-wire has very tight timming needing to stop IRQ and multitasking.
So I choose to use I2C bridge as described in this (french) page : Connexion à un bus 1-wire I'm very happy with DS2482-100 and DS2484 ... a bit less with DS2484-800 (random network loss). Bye | | | | Connexion à un bus 1-wire | | | Le mardi 9 octobre 2018 à 03:24:28 UTC+2, Jim Merkle <j...@merkles.com> a écrit : Gregg, It appears the Raspberry Pi comes with the OWFS support driver already installed in the image. The driver isn't loaded though. While preparing for a presentation concerning PIGPIO, I tested the connection of a DS18B20 to my Raspberry Pi. At the very bottom of this link, you will find a couple of notes I collected: http://www.merkles.com/EmbeddedWorkshop/PiGPIO.html In my example, I used gpiopin 18. You'll need a 4.7K ohm pull up resistor to 3.3V attached to the pin as well. Shoot me an email if you hit a problem. I wrote an example program that reads the DS18B20 via the SYSFS, and displays the temperature. Until you can see the sensor show up under /sys/bus/w1/devices, the example program won't help.... --- Jim Merkle Carrollton, TX 75007 j...@merkles.com On 2018-10-08 19:37, Gregg Levine wrote: > Hello! > I found a page who explains within reason how to make (some) use of a > Raspberry Pi GPIO point as a One-Wire hookup: > https://pinout.xyz/pinout/1_wire > > Naturally it does not go into a enough detail which is why I wanted to > ask the people here about it. > > I of course have the serial devices that most of us started with, and > can order a new USB adapter and can convince the company to send me > samples of the I2C chips for that purpose. > > > But since the Raspberry Pi folks tend to think that their device needs > no help in accessing such things I decided to give it a try. > ----- > Gregg C Levine gregg.drw...@gmail.com > "This signature fought the Time Wars, time and again." > > > _______________________________________________ > Owfs-developers mailing list > Owfs-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/owfs-developers _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
_______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
