3
Plug the disk and run sudo dmesg: There should be lines related to the USB host driver. If there aren't any, either the USB port, or the cable or the disk is broken, to the point there is no reliable electrical connection. If there are messages, they will likely be related to a new USB device not being able to register with the bus. There could be various ...
2
For one, you need a very good hub that can support a Raspi. Most won't deliver enough power. Also, the PD boards will drain a respective amount of power themselves (unfortunatelly, your link does not specify the max power output of these boards).
Depending on the power requirements of your sensor boards, I'd rather go the other way round and power everything ...
1
The absolute maximum rating of the Pi power converter chip is 5.45V. This must include any transient voltage peaks, noise, measurement errors, safety margin etc. Going over this limit will not necessarily destroy the Pi, but it will be a gamble.
E.g. if you are able to measure the voltage with 0.05V precision and your DC-DC converter regulation precision is ...
1
3 Amperes would almost certainly be more than sufficient power for your RPi. As @Milliways has pointed out in his answer however, an issue that you should be more concerned with is the performance of the power supply: How will it perform in my project, and has it been designed and produced properly? This is the point of my answer:
It is not clear to me why ...
1
That is a good question that I've wondered myself. I don't think there is a ready-made software solution that currently exists, unfortunately. A cool idea for a project would be to build a current measuring device into the USB cable so that you can actively view the reading via a LCD or OLED display. It would just be to extract the functionality of the ...
1
In my experience the best chance to get error logs from a crashing Pi is over a serial console. You need a system capable of logging the messages (e.g. a laptop with a USB to UART converter running Putty) connected at the time of the crash. A command which continuously prints log messages to the terminal (dmesg -w, logread -f, etc.) must be started in the ...
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