[VicPiMakers Projects] Application for Raspberry Pico

[James Briante]

George, have considered using  Can (Controlled Area Network) or Canopen for
your project? The line drivers/receivers are not expensive. At 1mbs
distance is good up to 40m. Best of all it’s a two-wire bus. For a simple
network you can design your own protocol:send a serial address and wait for
the corresponding sensor to reply with data. Here are a couple of examples
of what some hobbyists are doing with Can.



Yes We CAN BUS With Arduino in 30 Seconds! : 7 Steps (with Pictures) -
Instructables
<https://www.instructables.com/Yes-We-CAN-BUS-With-Arduino-in-30-Seconds/>

How to Connect Raspberry Pi to CAN Bus - Hackster.io
<https://www.hackster.io/youness/how-to-connect-raspberry-pi-to-can-bus-b60235>


Cheers,


Jim

On Tue, Apr 6, 2021 at 8:43 PM George Bowden <gtbowdeng at gmail.com> wrote:

> Looking for an application for my Raspberry Picos, I've been rethinking my
> serial LAN bus which was based on RS485.
>
> Given that
>
>    - Ethernet is the most common LAN
>    - Most of my alarm sensors only transmit data,
>    - Many of my uControllers don't have wifi
>
> I am considering transmitting UDP packets of sensor data to an always-on
> RPI 2B+ alarm center over Cat5 cable.  I'd use one twisted pair of the cat5
> at 5v for powering the 3.3v uController.
>
> This can be achieved with no external modules or components at 10mbps, I
> believe, by a Raspberry Pi Pico
> EtherPIC | Hackaday.io <https://hackaday.io/project/168551-etherpic> did
> this with PICs, but the Pico's  DMA, state machines, and programmable IO
> (PIO) and the faster speed might make it possible without the external XOR
> gates.  This is more than a blinky project, and is probably a healthy
> challenge for anyone joining in.  You will need only a Pico and a cat5
> cable.
>
> Published Pico projects contain some of the needed programming elements.
> https://github.com/raspberrypi/pico-examples#readme
>
> The CAT5 cable might even be bussed, given its only UDP that is
> transmitted, and a lost packet due to a collision is unimportant. Watch out
> for reflections though.
> --
> George Bowden  250-893-7423
> Victoria BC
> --
> Projects mailing list
> Projects at vicpimakers.ca
> http://vicpimakers.ca/mailman/listinfo/projects_vicpimakers.ca
>
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