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by pidd
Sun Nov 28, 2021 4:51 pm
Forum: Troubleshooting
Topic: XY-MOS Power Mosfet Module
Replies: 7
Views: 210

Re: XY-MOS Power Mosfet Module

I just realised another problem, the auxiliary supply in the alternator could back-feed out through D+ and go through your module to your power supply (Mosfets can allow current in either direction in the right conditions). It might be good to have a diode in series with the feed in to D+ to protect...
by pidd
Sun Nov 28, 2021 1:03 pm
Forum: Troubleshooting
Topic: XY-MOS Power Mosfet Module
Replies: 7
Views: 210

Re: XY-MOS Power Mosfet Module

I'm not sure, I would have thought it would need to used a modified alternator. The 12V 3.5A on D+ is normally supplied by the voltage regulator which is part of the alternator, you have your ignition bulb connected from tD+ to 12V to supply the initial excitation and then the alternator takes over ...
by pidd
Sat Nov 27, 2021 5:29 pm
Forum: Beginners
Topic: Smartmontools: UNRECOGNIZED OPTION: j
Replies: 7
Views: 279

Re: Smartmontools: UNRECOGNIZED OPTION: j

sudo apt install smartmontools still installs only v6.6 (2017-11-05). sudo dpkg -i smartmontools_7.2-1_armhf.deb gives: dpkg: error: cannot access archive 'smartmontools_7.2-1_armhf.deb': No such file or directory If you are still using buster then you can add debian's buster-backports to your repo...
by pidd
Fri Nov 26, 2021 4:54 pm
Forum: General discussion
Topic: STICKY: Raspberry Pi OS (64 bit) beta test version feedback
Replies: 995
Views: 264096

Re: STICKY: Raspberry Pi OS (64 bit) beta test version feedback

My work-around is to use a 1080p desktop; however, on my TV, the PiOS screen configuration tool does not work. When I set it to 1080p, it starts at 1080p60, but then switches to 2160p30 just before presenting the desktop (this is true of both 32-bit and 64-bit). The fix that worked was enabling VNC...
by pidd
Fri Nov 26, 2021 4:25 pm
Forum: MicroPython
Topic: GPIO output less than 3.3V
Replies: 11
Views: 387

Re: GPIO output less than 3.3V

I assumed "3V3 LED" meant a LED which needed a 3V3 forward voltage but accept I might be wrong about that. I had a LED which claimed to be such a thing but worked below 3V3 so, not being an electrical engineer, maybe that is a nominal specification or a colloquial characterisation. A 3.3V...
by pidd
Fri Nov 26, 2021 4:19 pm
Forum: Networking and servers
Topic: Connect ro Raspberry Pi in an open field
Replies: 8
Views: 289

Re: Connect ro Raspberry Pi in an open field

Ethernet would definitely be the easiest reliable method but does use quite a bit of power (compared to switching the Ethernet interface off altogether). Bluetooth will probably be lower power (if you switch WiFi and Ethernet off) and can be accessed as a network interface. Lower power still would b...
by pidd
Thu Nov 25, 2021 5:06 pm
Forum: Beginners
Topic: Power supply for pico
Replies: 5
Views: 191

Re: Power supply for pico

A PC or Raspberry Pi USB port will provide enough power for your Pico, but you can also use any micro-USB power supply (such as the official Raspberry Pi Universal power supply). If you want to power your Pico project away from a PC or wall plug, a simple 5V power bank combined with a micro-USB cab...
by pidd
Thu Nov 25, 2021 4:59 pm
Forum: Beginners
Topic: Backup to SSD
Replies: 5
Views: 229

Re: Backup to SSD

Or use RonR's image-backup from his image--file-utilities, this creates an .img file and has incremental capabilities. viewtopic.php?t=247568
by pidd
Thu Nov 25, 2021 4:54 pm
Forum: General
Topic: Are there any examples of using the Pico for frequency measurement?
Replies: 5
Views: 160

Re: Are there any examples of using the Pico for frequency measurement?

Or use the TIMELR register which is a 32-bit 1uS system clock.
by pidd
Thu Nov 25, 2021 4:59 am
Forum: Advanced users
Topic: Email server setup questions
Replies: 2
Views: 136

Re: Email server setup questions

Before you go any further, a couple of problems you might meet. If you have a non-static or shared IP address supplied by an ISP, your IP will probably be blacklisted so you will not be able to send mail reliably. If you have a non-static IP address you cannot reliably set up the email security in y...
by pidd
Thu Nov 25, 2021 4:27 am
Forum: Troubleshooting
Topic: bullseye won't boot on rpi 4 1 GB
Replies: 19
Views: 599

Re: bullseye won't boot on rpi 4 1 GB

Did you try the lite version?
by pidd
Wed Nov 24, 2021 2:36 am
Forum: MicroPython
Topic: GPIO output less than 3.3V
Replies: 11
Views: 387

Re: GPIO output less than 3.3V

Spec is 2.8V minimum so it is in spec. Might be a dying pin or might not be, if its not behaving the same as the other pins it might have some damage. A pull-up resistor will probably make it higher by effectively making the circuit open collector, depends on what 0V (sink) and 3.3V (source) loads y...
by pidd
Wed Nov 24, 2021 2:21 am
Forum: Troubleshooting
Topic: Keyestudio Electromagnet with Raspberry Pi
Replies: 6
Views: 124

Re: Keyestudio Electromagnet with Raspberry Pi

No guarantees, but this is the Grove version from Seeed Studio. The likelihood of this being a direct copy of the Keyes version (or vice versa) is quite high: https://wiki.seeedstudio.com/Grove-Electromagnet/ It's a low side driver, based on a MOSFET. I suppose it might not work, but trying it out ...
by pidd
Tue Nov 23, 2021 9:52 pm
Forum: Troubleshooting
Topic: Keyestudio Electromagnet with Raspberry Pi
Replies: 6
Views: 124

Re: Keyestudio Electromagnet with Raspberry Pi

It looks like there is a buffer transistor on the board. I'd try connecting VCC to 5V, GND to GND, and SIG to your chosen GPIO. Then set GPIO high to turn on the electromagnet, and low to turn it off. The GPIO only outputs 3.3V, but that might be sufficient to turn on the transistor. Yes, but some ...
by pidd
Tue Nov 23, 2021 9:45 pm
Forum: Beginners
Topic: Do I need 8 Gb or will 4 Gb suffice?
Replies: 5
Views: 196

Re: Do I need 8 Gb or will 4 Gb suffice?

Agree, 4GB should be fine, if you do upgrade to 8GB later, the ebay price on a used 4GB is a pretty good return rate and you can re-use all the ancillaries.
by pidd
Tue Nov 23, 2021 9:10 pm
Forum: Troubleshooting
Topic: Keyestudio Electromagnet with Raspberry Pi
Replies: 6
Views: 124

Re: Keyestudio Electromagnet with Raspberry Pi

You are using a 5V module on a 3.3V Pi, ideally you need a level shifter on the control pin.
by pidd
Tue Nov 23, 2021 8:48 pm
Forum: Troubleshooting
Topic: I cannot connect to the internet after changing to static IP
Replies: 9
Views: 226

Re: I cannot connect to the internet after changing to static IP

Try .local on the end of the Pi's hostname.
by pidd
Tue Nov 23, 2021 8:42 pm
Forum: Raspberry Pi OS
Topic: Chromium crashes trying to open YouTube
Replies: 151
Views: 12072

Re: Chromium crashes trying to open YouTube

EDIT 18:12 - and it's broken again. Typing www.youtube.com into address bar instantly crashes the browser once more. Is there any dump or log or other info I can provide that might help track down what's going on? :x :x :x Just switched back to chromium-browser v92 today, tested it fine ..... and y...
by pidd
Mon Nov 22, 2021 6:28 pm
Forum: Troubleshooting
Topic: Why are my cron jobs not running?
Replies: 5
Views: 172

Re: Why are my cron jobs not running?

How and/or where are you installing those cronjobs?
by pidd
Mon Nov 22, 2021 6:11 pm
Forum: Off topic discussion
Topic: Why are we using $
Replies: 9
Views: 1496

Re: Why are we using $

Posters often include the $ purposely to indicate what is a command line and what is returned from the program. $ free total used free shared buff/cache available Mem: 3929836 608944 717432 146012 2603460 2927272 Swap: 7878652 215296 7663356
by pidd
Mon Nov 22, 2021 3:10 am
Forum: Beginners
Topic: Can I upgrade to Bullseye witout destroying /home partition?
Replies: 3
Views: 192

Re: Can I upgrade to Bullseye witout destroying /home partition?

I'd just do it normally and retrieve your /home files from backup, you know everything will be right and proper. You could boot from the SD, mount the SSD somewhere eg /media/bla/root, /media/bla/boot and /media/bla/home, delete the unwanted SSD files, then rsync the files from SD to SSD, then adjus...
by pidd
Mon Nov 22, 2021 2:50 am
Forum: General discussion
Topic: Linux vs Windows
Replies: 116
Views: 3698

Re: Linux vs Windows

On static operating systems like some (not all) CP/M implementations your program operates outside the operating system, nothing goes on behind your back, the operating system functions only go dynamic when you call them and stop when control is returned to your program. i think that might also des...
by pidd
Sun Nov 21, 2021 10:26 pm
Forum: Raspberry Pi OS
Topic: STICKY: Bullseye - Comments and bug reports thread.
Replies: 457
Views: 24172

Re: STICKY: Bullseye - Comments and bug reports thread.

wilcal wrote:
Sun Nov 21, 2021 5:35 pm
There are some significant issues with the Bullseye release and at this point the Pi support team does not seem to be responding.
Perhaps the excellent level of Raspberry support is not for you., can you think of a better alternative?
by pidd
Sun Nov 21, 2021 10:05 pm
Forum: General discussion
Topic: Linux vs Windows
Replies: 116
Views: 3698

Re: Linux vs Windows

I use "in" because your program operates inside the operating system which sometimes has a mind of its own. On static operating systems like some (not all) CP/M implementations your program operates outside the operating system, nothing goes on behind your back, the operating system functi...
by pidd
Sun Nov 21, 2021 5:31 pm
Forum: General discussion
Topic: Linux vs Windows
Replies: 116
Views: 3698

Re: Linux vs Windows

In my experience, programming in Windows is a nightmare, programming in Linux is only half a nightmare :shock:

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