Raspberry Pi Forum - Recent Threads

RPi5 - PCN 65, revision 7 PCB

geralds — Wed, 04 Nov 2026 15:27:06 GMT

Hi all,

its just an info:

the RPi 5 PCB comes in revision 7:

[mention:79d2fd5c3dff4a8f807790decf9bc555:08ca0da0e0174a809832476c74d4f174]

best regards

Gerald

RE: RPi5 - PCN 65, revision 7 PCB

spinden — Thu, 05 Nov 2026 14:33:03 GMT

wonder if this would allow for getting lower density ram times two to allow for lower overall cost

Raspberry Pi 5 randomly reboots when powering an SSD over USB

italo_ragazzo — Wed, 30 Sep 2026 02:10:21 GMT

I’m using a Raspberry Pi 5 with an NVMe SSD connected through a USB 3 enclosure. The Pi works normally when the SSD is disconnected, but occasionally reboots when the SSD is under sustained read/write load.I purchased this one in Italy, so it might function differently.

The power supply is rated at 27W, and the issue seems more likely to happen when the CPU is also under load. Has anyone seen this with the Raspberry Pi 5, and would using a higher-rated USB-C supply or a powered USB hub be the recommended solution?

Thank you

best,
Salvatore B.
florist Italy
LTC

RE: Raspberry Pi 5 randomly reboots when powering an SSD over USB

Andrew J — Sat, 03 Oct 2026 13:49:53 GMT

I've just checked what I have. The case is an Argon One V3 m.2 https://argon40.com/en-gb/products/argon-one-v3-m-2-nvme-case. The power supply is an official PI supply, P1224, rated 5.1V 5.0A (the 27W version.) The power supply connects directly into the case through a USB C port. I see there is a higher powered supply, 45W, but that is profiled at 9V 5A and offers the same 5.1V 5A profile so I can't see it making any difference. I don't know that power is a problem in any case!

RE: Raspberry pi as a SPI slave

salmun — Thu, 01 Oct 2026 06:58:15 GMT

If you’re using a Raspberry Pi 4, I’ve published an experimental Linux driver for its BSC SPI slave peripheral: bcm2711-spi-slave-driver. It provides one SPI slave interface through /dev/bcm2711_spi_slave, with wiring and installation instructions. It won’t provide two independent slave buses by itself.

Raspberry pi as a SPI slave

OriolPascual — Wed, 20 Mar 2024 14:26:04 GMT

Hi,

I need to configure a setup to have two SPI buses, with the Raspberry Pi acting as the slave in both cases. Despite searching extensively, I couldn't find any information on how to achieve this.

My conclusion is that the Raspberry Pi might not be designed for this specific use case, as it seems reluctant to operate as a slave device. However, I'm reaching out to see if anyone has managed to configure it in this way and if there are any resources or documentation available that could help me achieve this configuration.

Any guidance or insights would be greatly appreciated.

RE: Raspberry Pi 5 randomly reboots when powering an SSD over USB

colporteur — Wed, 30 Sep 2026 20:53:49 GMT

I'm not that confident in all PI5 supplies being the same. The 5A sucker is much larger and weightier than the typical Pi power supply. I have a variety of PS kicking around and the size I noticed.

I'm not saying you are wrong but PS for Pi's has always been contentious issue for me.

RE: Raspberry Pi 5 randomly reboots when powering an SSD over USB

Andrew J — Wed, 30 Sep 2026 18:41:28 GMT

When I get home I’ll dig it out. I formatted it with HAOS but presumably the underlying config is common.

RE: Raspberry Pi 5 randomly reboots when powering an SSD over USB

Andrew J — Wed, 30 Sep 2026 18:39:16 GMT

IIRC the power supply plugs into the enclosure to power everything. It is a PI5 case rather than a generic one.

RE: Raspberry Pi 5 randomly reboots when powering an SSD over USB

ralphjy — Wed, 30 Sep 2026 18:25:50 GMT

I should have added that you need to verify the USB power capability of the ports on the hub and enclosure. The best solution is probably to use a self-powered enclosure. Does yours have the ability to plug in an external power supply?

RE: Raspberry Pi 5 randomly reboots when powering an SSD over USB

veluv01 — Wed, 30 Sep 2026 17:05:59 GMT

Here's the USB Power Delivery WhitePaper

RE: Raspberry Pi 5 randomly reboots when powering an SSD over USB

veluv01 — Wed, 30 Sep 2026 17:04:02 GMT

RE: Raspberry Pi 5 randomly reboots when powering an SSD over USB

ralphjy — Wed, 30 Sep 2026 16:37:57 GMT

If you are already using the official RPi 27W supply, then you can't get any more power through the USB-C input. I think it would be worth trying a powered hub to isolate the problem. A single USB3 port is limited to around 900mA which might be exceeded by your NVMe SSD during peak operations. Also, be careful of using higher wattage supplies like the MultiComp 30W which only supplies 5V at 3A (the higher wattage is for higher voltages in the USB-PD).

RE: Raspberry Pi 5 randomly reboots when powering an SSD over USB

chekov — Wed, 30 Sep 2026 16:27:29 GMT

Not sure if this will help get to the root of this particular problem, but they do discuss some methods to measure power consumption here:

forums.raspberrypi.com/viewtopic.php

RE: Raspberry Pi 5 randomly reboots when powering an SSD over USB

cstanton — Wed, 30 Sep 2026 15:54:04 GMT

The problem might be with the enclosure, sometimes they do not expect higher power pull which has changed depending on what PCIe standard they expect/support.

RE: Raspberry Pi 5 randomly reboots when powering an SSD over USB

Andrew J — Wed, 30 Sep 2026 15:44:03 GMT

Thanks. Must be some other incompatibility then; I just couldn’t get to the bottom of it and because I was using it for HA, which I got thoroughly #}%&£@ off with, I gave up on it. At least until I find another project suitable for the PI.

RE: Raspberry Pi 5 randomly reboots when powering an SSD over USB

cstanton — Wed, 30 Sep 2026 15:36:18 GMT

The official Pi 5 supply is exactly the correct one to use with the required USB-PD profile. It should be enough.

RE: Raspberry Pi 5 randomly reboots when powering an SSD over USB

Andrew J — Wed, 30 Sep 2026 15:31:09 GMT

I have the official PI5 supply. Not at home for a few days so out of interest, is that good enough?

RE: Raspberry Pi 5 randomly reboots when powering an SSD over USB

cstanton — Wed, 30 Sep 2026 13:53:36 GMT

[quote userid="510920" url="~/products/raspberry-pi/f/forum/57316/raspberry-pi-5-randomly-reboots-when-powering-an-ssd-over-usb/238464"]If the power supply you're using doesn't have the 5V 5A profile,[/quote]

Yes, thank you. This's the particular USB-PD profile that the Pi 5 is fussy about.

RE: Raspberry Pi 5 randomly reboots when powering an SSD over USB

veluv01 — Wed, 30 Sep 2026 12:51:16 GMT

I'm using the M.2 HAT+ to access the NVMe SSD (uses around 5W on R/W, running SLM's) , it works without any problem. If the power supply you're using doesn't have the 5V 5A profile, it's also a cause of the issue you're facing.

RE: Raspberry Pi 5 randomly reboots when powering an SSD over USB

cstanton — Wed, 30 Sep 2026 09:35:34 GMT

[quote userid="525719" url="~/products/raspberry-pi/f/forum/57316/raspberry-pi-5-randomly-reboots-when-powering-an-ssd-over-usb"]The power supply is rated at 27W, and the issue seems more likely to happen when the CPU is also under load[/quote]

What are the USB-PD profiles available on your power supply?

The Raspberry pi 5 requires a non-standard (or I should say, not typical) USB-PD (power delivery) profile to ensure the USB ports are given full power.

RE: Raspberry Pi 5 randomly reboots when powering an SSD over USB

Andrew J — Wed, 30 Sep 2026 08:31:02 GMT

I’ve had the same. A supposedly compatible enclosure with compatible NVMe SSD and it was very unreliable. I was running Home Assistant, which would frequently crash with no logs or other information. I never got to the bottom of why and I got totally fed up with HA itself so it is all just stuck in a corner now. If you do work anything out, please report back.

Is it possible to read simultaneously from same sensor with python raspberry pi

Kenne76 — Tue, 21 Jul 2026 09:21:19 GMT

Is it possible to read simultaneously (to two variables) from same sensor with python raspberry pi?

RE: Is it possible to read simultaneously from same sensor with python raspberry pi

dougw — Tue, 21 Jul 2026 21:20:17 GMT

RPi is a sequential machine. How much time do you have to copy to 2 variables and still call it simultaneous?

RE: Is it possible to read simultaneously from same sensor with python raspberry pi

Jan Cumps — Tue, 21 Jul 2026 09:39:35 GMT

Do you have info about the sensor, and what protocol needs to be used to read its data?

(and what is your definition of simultaneously? Is there any time allowed between the reads?)