[VicPiMakers Projects] Can-bus like apartment project

[James Briante]

George,
Re: grounding 2- twisted pair. The only communication that works on two
physical wires that I'm aware of is the Dallas 1-wire  and the CAN bus used
in cars and industrial applications. In both cases there is nothing to
ground. The CAN bus is available in PSoc 5 microcontroller from Cypress
Semiconductors. Like all networks it requires additional hardware and a lot
of spare time! Good luck on your project.

Below is a link on a network using 1-wire for home automation.

https://www.instructables.com/Home-automation-project-based-on-1-wire-devices/

On Sun, Oct 25, 2020 at 11:13 AM George Bowden <gtbowdeng at gmail.com> wrote:

> Hi all
> How to ground devices on a DIY low speed fault tolerant Can Bus??
>
> I'm planning about a dozen sensors in several rooms in my apartment , a
> couple actuators, a few micro controllers and a Raspberry PI communications
> hub that connected to the internet for sending SMS messages to my phone .
> STM32 microcontrollers don't normally come with wifi so a wired network of
> these cheap devices in an apartment is reasonable.
>
> I've chosen a single unshielded twisted pair Can Bus, tacked in the
> ceiling corners where it is almost invisible.  Yes, I thought about doing
> it other ways and chose this.  The antenna aspects might be challenging..
>
> I'm using the fault tolerant low speed can bus standard.
> <https://en.wikipedia.org/wiki/CAN_bus#/media/File:ISO11898-3_Waveform.svg>
> The bus will be optically isolated from the balcony.   Can I use ground
> from AC power as a common ground between devices?  I think ground loops in
> this environment will be negligible.
>
> [image: image.png]
>
>
> --
> George Bowden, vice president, Victoria Computer Club
> gtbowdeng at gmail.com
> --
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>
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