I was thinking multiple RPi Picos to one RPi4, but for just one, that is probably the way to go.
I'll try that first!

The Pi Hat as the carrier board is also a good idea.

On 1/21/2021 7:46 PM, Chris Albertson wrote:
I'd bet SPI would work well but even easier would be to connect them to the
Pi4 with USB.  Both sides have software that makes the USB look like a
serial port and the physical connection is done with off the shelf cable.

I've used M0 boards this way in the past and using USB lets you also cnet
them to a Linux PC

What I like about the Pico is that it can be SMT hand soldered.  I can make
a simple passive carrier board that has connectors and it is not hard to
hand solder 0.1 inch pitch.  The carrier board could be a Pi-hat

On Thu, Jan 21, 2021 at 4:30 PM Dave Cole <linuxcncro...@gmail.com> wrote:

I wonder if these could act as SPI slaves to the RPI 4?

I've been trying to buy two from Adafruit and they keep selling out and
then coming back in stock, and then selling out again!

Dave

On 1/21/2021 6:36 PM, andy pugh wrote:
On Thu, 21 Jan 2021 at 21:52, Chris Albertson <albertson.ch...@gmail.com>
wrote:
This is an STM32 microcontroller.
Are you sure? It is an ARM Cortex M0, like the STM32, but is it made by
ST?

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