Raspberry Pi 5

[Michael GilliganParticipant @michaelgilligan61133]

[Michael GilliganParticipant @michaelgilligan61133]

Coming soon :**LINK**

https://www.raspberrypi.com/products/raspberry-pi-5/

MichaelG.

[JAParticipant @ja]

It could almost compete with my twelve year old lap top.

JA

[Dave SParticipant @daves59043]

Its more like a 5 year old laptop really…

Totally usable as a 'normal' computer.

Also not many old laptops can do 2 screens at 4k/60, have 2 cameras and GPIO.

I think this one is going to end up as the CNC controller for my CNC build.

Dave

[Michael GilliganParticipant @michaelgilligan61133]

How did you get one before the release-date, Dave ?

Back-end of October was what I read 

MichaelG.

Edited By Michael Gilligan on 28/09/2023 18:02:44

[Dave SParticipant @daves59043]

I'm Head of Engineering at a Raspberry Pi Design Partner.

One of the harder parts of the job is knowing the stuff which is coming and not telling anyone…

Dave

[Michael GilliganParticipant @michaelgilligan61133]

So presumably you’ve thoroughly tested it and I’m safe pre-ordering one

MichaelG.

[Dave SParticipant @daves59043]

Its the best Pi yet.

Would recommend getting the cooler or the dedicated case with fan in it – the CPU runs quite a bit hotter than the 4 – not dangerously so, but hot enough that I'll be adding a cooler once I get round to it.

It can also peak a lot of current from the PSU, so whilst the 3A supply for a Pi4 is fine (that's what I'm currently using) if you don't have a lot of things hanging off the USB etc the new supply is designed to support maximum performance. I will be buying (with my own money) one of those when they become available.

Seeing it run with a pair of cameras and 2 4k screens was impressive – I can see it being the basis for a Projector + cameras shape measurement system at 'fairly' low cost. (I used to do precision high speed large volume optical metrology at a previous job).

The PCIe connector is going to open up some interesting possibilities…

Interestingly the feature the Pi team seemed most pleased with was the power button…

Dave

[Michael GilliganParticipant @michaelgilligan61133]

Thanks, Dave … much appreciated

MichaelG.

[John McNamaraParticipant @johnmcnamara74883]

Gee Dave
You Mentioned, "(I used to do precision high speed large volume optical metrology at a previous job)".

Are you able to say how?

Regards
J

[Russell EberhardtParticipant @russelleberhardt48058]

Posted by Dave S on 28/09/2023 17:50:22:

I think this one is going to end up as the CNC controller for my CNC build.

Dave

Looks like a good candidate to replace the Dell computer I bought second hand 10 years ago for my CNC build. Can the raspberry Pi version of Linux CNC emulate a parallel printer port for my driver electronics?

Russell

[Mark RandParticipant @markrand96270]

Posted by Russell Eberhardt on 29/09/2023 10:32:59:

Looks like a good candidate to replace the Dell computer I bought second hand 10 years ago for my CNC build. Can the raspberry Pi version of Linux CNC emulate a parallel printer port for my driver electronics?

Russell

Should be a fairly simple bit of coding. The Centronics interface is/was pretty simple minded. Enough so that I emulated it woth oneof our HP computers in the early '90s in order to drive a printer that had been bought in mistake by the department.

[Benedict WhiteParticipant @benedictwhite51126]

Posted by Dave S on 28/09/2023 18:04:36:

I'm Head of Engineering at a Raspberry Pi Design Partner.

One of the harder parts of the job is knowing the stuff which is coming and not telling anyone…

Dave

Cheat!

[Dave SParticipant @daves59043]

John,

This should link the the sales pdf: Wayback Machine (archive.org)

Basically project a load of straight lines, take a photo form the side, do some maths to decode the bendyness the camera sees.

A quick google shows there are several parallel port HATs available for a Pi – thats probably the route I would take if I needed to.

Dave

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Dave S on 29/09/2023 12:11:32:

John,

This should link the the sales pdf: Wayback Machine (archive.org)

[…]

.

Am I being dim, Dave ?

… your link only gives me the glossy front-cover

MichaelG.

[Dave SParticipant @daves59043]

Should be a 7 or 8 page brochure. The company was Phase Vision, so you could always search phasevision.com on the wayback machine.

Sadly ran out of money, as with a lot of startup / spinouts.

Dave

[Michael GilliganParticipant @michaelgilligan61133]

… of Loughborough, no less

[ I did Ergonomics with Human Biology there ]

Still digging for the brochure, but I did find this interesting paper:**LINK**

https://web.archive.org/web/20190427012848id_/https://www.spiedigitallibrary.org/journals/Journal-of-Biomedical-Optics/volume-16/issue-6/066005/Comparison-on-different-insects-wing-displacements-using-high-speed-digital/10.1117/1.3586778.pdf

MichaelG.

[Michael GilliganParticipant @michaelgilligan61133]

[Russell EberhardtParticipant @russelleberhardt48058]

Posted by Dave S on 29/09/2023 12:11:32:

A quick google shows there are several parallel port HATs available for a Pi – thats probably the route I would take if I needed to.

Dave

Thanks, one of those should do the trick.

Russell

[BazyleParticipant @bazyle]

Posted by Russell Eberhardt on 29/09/2023 16:51:14:

Posted by Dave S on 29/09/2023 12:11:32:

A quick google shows there are several parallel port HATs available for a Pi – thats probably the route I would take if I needed to.

Dave

Thanks, one of those should do the trick.

Russell

I thought the big problem for LinuxCNC using the printer port was the multitasking of the processor, particularly video generation, screwing up the timing for direct drive of steppers. It should be possible to avoid this by leaving one of the cores for the user to use unmolested, but is that the case?

[Russell EberhardtParticipant @russelleberhardt48058]

Posted by Bazyle on 29/09/2023 18:05:50:

I thought the big problem for LinuxCNC using the printer port was the multitasking of the processor, particularly video generation, screwing up the timing for direct drive of steppers. It should be possible to avoid this by leaving one of the cores for the user to use unmolested, but is that the case?

Well, my current cnc system runs LinuxCNC on a single core 3.2 GHz processor. Yes. the parallel printer port does cause some timing issues but I found the reduced step rate needed to prevent lost steps was still fast enough for me. I would imagine the four cores at 2.4 GHz of the Pi 5 should beat my old computer.

Russell

[sam sokolikParticipant @samsokolik60334]

well – for linuxcnc it depends on the realtime latency of the system. I have been running the PI4 with linuxcnc for a long time – but using a mesa ethernet card to do the heavy lifting. (step generation and such)

The maximum jitter I get is around 50us or so. This is perfectly fine for external interfaces like mesa.

Linuxcnc does have a gpio driver for the pi – but again you are limited to how fast the realtime kernel can twittle bits. I I goofed around with it a while back – and was getting about 10khz step rates. Not stellar…

[Russell EberhardtParticipant @russelleberhardt48058]

Posted by sam sokolik on 30/09/2023 16:10:51:

well – for linuxcnc it depends on the realtime latency of the system. I have been running the PI4 with linuxcnc for a long time – but using a mesa ethernet card to do the heavy lifting. (step generation and such)

The maximum jitter I get is around 50us or so. This is perfectly fine for external interfaces like mesa.

Linuxcnc does have a gpio driver for the pi – but again you are limited to how fast the realtime kernel can twittle bits. I I goofed around with it a while back – and was getting about 10khz step rates. Not stellar…

My ancient system is giving a maximum jitter of 25uS and I am happy with the maximum step rate. I have no need for particularly fast movements.

Might the GPU of the Pi 5 take load off the processors and improve the latency over the model 4?

Russell

Russell

[Author]

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