<div dir="ltr">Hi all<div>How to ground devices on a DIY low speed fault tolerant Can Bus??</div><div><br></div><div>
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. </div><div><br></div><div>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.. </div><div><br></div><div>I'm using the <a href="https://en.wikipedia.org/wiki/CAN_bus#/media/File:ISO11898-3_Waveform.svg">fault tolerant low speed can bus standard.</a> 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. </div><div> </div><div><div><img src="cid:ii_kgpe96b70" alt="image.png" width="471" height="425"><br></div></div><div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div>George Bowden, vice president, Victoria Computer Club<br><a href="mailto:gtbowdeng@gmail.com" target="_blank">gtbowdeng@gmail.com</a></div></div></div></div></div>