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8 Channel 1-Wire Master for the B+

Posted: Sun Aug 17, 2014 6:03 pm
by repton
I've just built up the first of the PCBs for my 8 Channel 1-Wire Master for the B+. It's electrically identical to my existing RPI3 board with physical changes to fit the B+ format. Please forgive the 26way GPIO connector as I don't have any 40way ones yet.

Paul

Re: 8 Channel 1-Wire Master for the B+

Posted: Mon Aug 18, 2014 9:12 am
by dan3008
thats handy, I've never considered using RJ45 and cat5/5e/6 cables for sensors and the like

keep up the good work :)

Re: 8 Channel 1-Wire Master for the B+

Posted: Mon Aug 18, 2014 12:14 pm
by AndrewS
I have no interest in 1-Wire myself, but I was curious to see a USB socket mounted to the board!

So I had a look at your website and I see you're using this purely as an 'external power input' socket. However in that case, why are you using a USB A socket (which is used by host devices, i.e. the ones normally supplying the power) rather than a USB B socket (which is used by slave devices, i.e. the ones normally consuming the power) :?:

Re: 8 Channel 1-Wire Master for the B+

Posted: Tue Aug 19, 2014 4:52 pm
by repton
AndrewS wrote:However in that case, why are you using a USB A socket (which is used by host devices, i.e. the ones normally supplying the power) rather than a USB B socket (which is used by slave devices, i.e. the ones normally consuming the power) :?:
No reason really other than I guess that I happened to have some USB-A sockets kicking around when I made the first prototype of the original RPI3 a couple of years ago and it stuck. I've had a couple of people as why I don't use a Micro-USB like the RasPi itself too and my answer to that is that I worry that they're not mechanically strong enough and given I'm not short of PCB space I have decided to stick with the bigger socket. That said I do realise that with a couple of million RasPis out there using Micro-USB for power that I'm probably worrying for no reason.

Paul

Re: 8 Channel 1-Wire Master for the B+

Posted: Tue Aug 19, 2014 5:29 pm
by fruit-uk
I have lots of USB A leads accumulated over the years but only a few micro USB so I'm quite happy with the choice of socket on my RPI3. The plugs are a lot easier to solder too!

Re: 8 Channel 1-Wire Master for the B+

Posted: Tue Aug 19, 2014 10:35 pm
by AndrewS
repton wrote:
AndrewS wrote:However in that case, why are you using a USB A socket (which is used by host devices, i.e. the ones normally supplying the power) rather than a USB B socket (which is used by slave devices, i.e. the ones normally consuming the power) :?:
No reason really other than I guess that I happened to have some USB-A sockets kicking around when I made the first prototype of the original RPI3 a couple of years ago and it stuck.
Heh, I wondered if it might be something like that ;)
fruit-uk wrote:I have lots of USB A leads accumulated over the years
But how many of those are USB-A -> USB-A, which is presumably what this board needs? (and of course are totally against the USB spec, since you should never connect a host device directly to another host device)
The plugs are a lot easier to solder too!
Well, that's what full-size USB-B sockets are for ;)
http://en.wikipedia.org/wiki/Usb#Connector_types

But the RPI3 board has obviously developed it's own "standard" and if all the users are happy there's no point changing it now 8-)
Apologies for the "intrusion".

Re: 8 Channel 1-Wire Master for the B+

Posted: Wed Aug 20, 2014 6:33 pm
by repton
AndrewS wrote:Apologies for the "intrusion".
No apology needed, I'm always up for constructive suggestions :)

Paul

Re: 8 Channel 1-Wire Master for the B+

Posted: Fri Nov 28, 2014 6:27 pm
by repton
I've now got some 2x20 headers in stock and a batch of the PCBs made and these are now on sale:

http://www.sheepwalkelectronics.co.uk/p ... ucts_id=67

As you can see from the below photos they fit perfectly on both the A+ and B+.
RPI3v2-Amed.jpg
RPI3v2-Amed.jpg (47.79 KiB) Viewed 3388 times
RPI3v2-Bmed.jpg
RPI3v2-Bmed.jpg (44.77 KiB) Viewed 3388 times
Paul

Re: 8 Channel 1-Wire Master for the B+

Posted: Tue Jan 27, 2015 11:31 am
by stevegarratt
Hi Paul,

I'm looking to use your products in a store monitoring application but some of the devices I want to use are i2c. Is it possible to run i2c together with the 1-wire by modifying the boards a little perhaps.

I've submitted a contact request on the Sheepwalk site but not had a reply yet.

Steve

Re: 8 Channel 1-Wire Master for the B+

Posted: Sun Feb 22, 2015 10:11 am
by james-at-lo-tech
IIRC some IBM laptops use USB-A for power input (coloured yellow I think).

Re: 8 Channel 1-Wire Master for the B+

Posted: Sun Feb 22, 2015 3:38 pm
by DougieLawson
james-at-lo-tech wrote:IIRC some IBM laptops use USB-A for power input (coloured yellow I think).
No they don't.

The Lenovo laptops (IBM sold out laptops to Lenovo many years ago) normally run on a 19V barrel plug. The yellow socket is an always on USB so you can charge your phone

Re: 8 Channel 1-Wire Master for the B+

Posted: Sun Feb 22, 2015 6:17 pm
by james-at-lo-tech
My mistake - the plug just looks similar at a glance (see here).