Does anyone know if I could build my own adapter board for a Pi 3 Model A+? Apologies if this has been asked before.
01/11/2023, 11:43 PM
An adapter to use on a Turing Pi system? There is a huge difference between say a CM4 and a Raspberry Pi 4B. Sure they have the same processor and RAM, but the form factor is totally different. The CM4 has pins on the bottom and it is designed to go on a board.
01/11/2023, 11:45 PM
Yeah, but an adapter could exist. There was some discussion lately over #754950670175436848 iirc, and someone wants to make one for their KS project
So the same way adapter for CM exists, there might be one made for CM3s I suppose
Assuming they meant CM3, of course
Or maybe they did not...
I think you're actually right and they meant RPi not CM
01/11/2023, 11:55 PM
Yes, they are talking about a RPI. So they are going to make a board for what, the GPIO pins?
01/12/2023, 12:01 AM
Sadly it won't work for RPi this way. More functions than just GPIO would have to be exposed, as in CM modules in general.
I've seen this question before, just missed the fact they meant RPi3 not CM3
01/12/2023, 1:17 AM
You can't expose the other functions as they were not intended to be exposed on anything but the RPI. The CM4 was designed so that the carrier board would provide what is physically missing from a CM4.
At the end of the day the RPI is designed to be a self contained system.
The CM4 was designed to support a number of different form factors and that a carrier board would be needed for whatever the task at hand was and it would expose the functions that were needed. The CM4 was really more designed for integrators. If you need wireless you can get CM4's with that. If you don't want wired Ethernet, then the carrier board doesn't have to support it. The PCIE interface can be used for many different things. For someone making a commercial product, the CM4 makes a lot more sense that a Raspberry Pi 4B would.
A good example the Pi KVM. The V3 variant was a HAT that went on a RPI. Now they are making a new variant using a CM4 module.
With that said, the pinout for where the carrier board is not a secret. The Nvidia Jetson modules just plug in without a carrier board. The CM4 takes a carrier board. So you could create a carrier board for the Turing Pi for almost anything you wanted. How you get the capability from the module to carrier and thus to the Turing Pi v2 is all on you.
If you meant the CM3, the reason why they aren't producing a carrier board probably comes down to R&D. They would need to design it, support it and they already sold a product that uses the CM3. For where they are going with the Turing Pi v2, the use of CM3's would low and doesn't really fit with the rest of the modules you can/could use.