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by bjtheone
Fri Dec 03, 2021 1:21 pm
Forum: General discussion
Topic: Help with audio
Replies: 20
Views: 613

Re: Help with audio

Thanks for the clarification. I still would recommend externally powered analog speakers using the AV jack, to keep the USB ports free and reduce power demand, but agree that is an extra set of wires. In my case, all the wiring is hiding behind the monitor so I don't care, plus I am using all the US...
by bjtheone
Thu Dec 02, 2021 2:57 pm
Forum: Beginners
Topic: Raspberry Pi as a Pinter Manger/Server
Replies: 5
Views: 212

Re: Raspberry Pi as a Pinter Manger/Server

I believe you can achieve what you want to do print wise (and as a former Unix sysadmin think that Linux systems are easier to remote admin than Windows). Scanning adds a fairly significant wrinkle. There is support for "some" scanners using SANE, and you could wrap the process to postproc...
by bjtheone
Thu Dec 02, 2021 2:32 pm
Forum: General discussion
Topic: Help with audio
Replies: 20
Views: 613

Re: Help with audio

with regards to audio only solution.... I suggest a USB speaker (the one that does not have an audio plug).... to reduce number of wire for the setup Not quite following. You would still have the speaker to PI USB port connection, and have the additional downsides of consuming a USB port and added ...
by bjtheone
Wed Dec 01, 2021 8:08 pm
Forum: Other
Topic: Twister OS to Bullseye
Replies: 6
Views: 331

Re: Twister OS to Bullseye

2 Options: 1) Replicate what Twister is using RPiOS (Bullseye) Lite + X11 + Desktop Manager of your choice + some theming 2) Wait for whomever built Twister to refresh to Bullseye as a base Lite + X11 + Desktop Manager is a fabulous choice, where you get all the RPT enhancements to Debian plus move ...
by bjtheone
Wed Dec 01, 2021 6:55 pm
Forum: Beginners
Topic: Backup strategy
Replies: 2
Views: 139

Re: Backup strategy

It depends on your needs and scope. My Pi's are personal machines and I mostly care about user data. I also use a combination of daily rsync for user data, and full OS images, along with emergency boot SD cards. My desktop systems run off SSD, and I use the SD slot to hold my daily backup media.
by bjtheone
Wed Dec 01, 2021 6:21 pm
Forum: General discussion
Topic: Help with audio
Replies: 20
Views: 613

Re: Help with audio

I use a inexpensive set of powered "computer speakers" (Logitech z150 https://www.amazon.ca/Logitech-Channel-Computer-Speaker-980-000802/dp/B00EZ9XLEY/ref=sr_1_11?keywords=logitech+powered+speakers&qid=1638369847&sr=8-11 ) and they work great and certainly provide enough volume fo...
by bjtheone
Wed Dec 01, 2021 3:49 pm
Forum: Troubleshooting
Topic: How do you not display screen lock?
Replies: 4
Views: 126

Re: How do you not display screen lock?

klricks wrote:
Wed Dec 01, 2021 1:02 pm
If sudo is required then something is wrong.
Check which user "owns" the display and which user is running the python program. You either need to have privileges (same user), have override (root) or open up the display.
by bjtheone
Wed Dec 01, 2021 3:32 pm
Forum: Beginners
Topic: is it possible to boot over wifi yet?
Replies: 26
Views: 863

Re: is it possible to boot over wifi yet?

I don't play at that software level but thinking about it, why would a Bluetooth stack be much smaller than WiFi, given that they are both implementing wireless networking protocols. A quick google did not turn up implementation sizes but I would be surprised if it would be much simpler to cram a Bl...
by bjtheone
Wed Dec 01, 2021 2:51 pm
Forum: General discussion
Topic: 3B+ tablet
Replies: 8
Views: 295

Re: 3B+ tablet

Are you using length, width or depth of said pool? Sorry I didn't specify. I'm using the longest dimension (length, which is 50 meters). I suppose it could be argued that I should have used depth, but that is not specific (2.0 meters minimum, 3.0 meters recommended). ;) I would suggest volume...
by bjtheone
Wed Dec 01, 2021 2:48 pm
Forum: General discussion
Topic: Help with audio
Replies: 20
Views: 613

Re: Help with audio

Any powered standard 3.5 mm audio plug speakers will work. Unpowered speakers will likely not be able to produce the required volume, since it the jack is pretty much "line out" levels. USB speakers might fair slightly better, but you do have fairly limited power available via USB, and it ...
by bjtheone
Wed Dec 01, 2021 2:28 pm
Forum: General discussion
Topic: Powering Pi4 from Dual USB/Mains switched power socket (UK)
Replies: 8
Views: 320

Re: Powering Pi4 from Dual USB/Mains switched power socket (UK)

Thank you for all of your replies. I do concur. I have been thinking about using one for a while but I have always had safety/reliability thoughts. I will stick with what I've got. All I wanted to do was get rid of a power block. I have a double socket next to my Pi. Ethernet over mains plug (no pl...
by bjtheone
Tue Nov 30, 2021 3:35 pm
Forum: Beginners
Topic: is it possible to boot over wifi yet?
Replies: 26
Views: 863

Re: is it possible to boot over wifi yet?

ok thanks. its just with the better booting support i thought it might have been added, as usb-boot is alot better now and ethernet-network-booting still works. oh and for "LTolledo";- "something" already knows how to boot from usb, "something" also knows how to boot o...
by bjtheone
Tue Nov 30, 2021 3:21 pm
Forum: Beginners
Topic: Very New, Very Frustrated
Replies: 26
Views: 1403

Re: Very New, Very Frustrated

Depending on what you are trying to do with OpenCV, I suspect that a Pi Zero is going to be woefully underpowered. My experience is with doing target acquisition and positions in FRC robotics. The targets we were finding and tracking were simple and fairly distinct shapes created by retroreflective ...
by bjtheone
Fri Nov 26, 2021 5:09 pm
Forum: General discussion
Topic: Stackable Cases
Replies: 6
Views: 357

Re: Stackable Cases

Looks great, but I'm afraid it might not me compatible with my Beocreate hat ( https://www.hifiberry.com/beocreate ). :( Maybe by withdrawing one floor ? They typically work really well with odd HATs, just have to use longer standoffs to get a larger spacing for the Pi (or Pis) that has the tall HAT.
by bjtheone
Thu Nov 25, 2021 6:59 pm
Forum: Troubleshooting
Topic: To speed up the image reading from directory
Replies: 3
Views: 107

Re: To speed up the image reading from directory

Number of files in the directory might also be impacting the performance.
by bjtheone
Thu Nov 25, 2021 6:45 pm
Forum: Beginners
Topic: Raspberry Pi OS - which to choose? Lite, w/Desktop or Recommended
Replies: 8
Views: 325

Re: Raspberry Pi OS - which to choose? Lite, w/Desktop or Recommended

The other point I would add is that if you want to use a different Desktop manager than LXDE (which is what is included with the GUI bundles), which is likely not a beginner issue, I would strongly suggest starting with Lite and adding the Desktop Manager you want. This results in a cleaner install ...
by bjtheone
Thu Nov 25, 2021 6:38 pm
Forum: Beginners
Topic: Backup to SSD
Replies: 5
Views: 247

Re: Backup to SSD

For a Pi running off a SSD, I use the "built in" SD slot, and backup files I care about to that device. I don't care about backing up the OS, since I have spare OS SDs available.
by bjtheone
Thu Nov 25, 2021 6:31 pm
Forum: General discussion
Topic: What is the size of the included sd card?
Replies: 17
Views: 931

Re: What is the size of the included sd card?

Ture, however, it is fairly easy to bloat up the install depending on what you decide you want to add, and then there are user data files. Plus the main reason... 16GB namebrand (I choose SanDisk for this exercise): 16 GB for $10.99, 32 GB for $12.49 (as per Amazon Canada). I know you can buy in bul...
by bjtheone
Thu Nov 25, 2021 3:12 pm
Forum: General discussion
Topic: Stackable Cases
Replies: 6
Views: 357

Re: Stackable Cases

Open cases are fabulous from a thermal perspective, and provide great protection from shorts and dropping crap on them.
by bjtheone
Thu Nov 25, 2021 3:10 pm
Forum: General discussion
Topic: What is the size of the included sd card?
Replies: 17
Views: 931

Re: What is the size of the included sd card?

For a normal config likely the sweet spot (size vs price) is a 32 GB card. If you are using it as a desktop I would suggest at least 64 GB, though a SSD will provide a noticeable performance boost. I second the suggestion for the Kingston A400 SSDs, and have 2 of the 128 GB cards for my 4B "des...
by bjtheone
Wed Nov 24, 2021 7:42 pm
Forum: Beginners
Topic: Backup to SSD
Replies: 5
Views: 247

Re: Backup to SSD

There are ways to make reasonably good backups of live file systems (for varying values of reasonably good). However the only way with a ext4 filesystem to make a truly 100% good backup is with the file system inactive. Nothing is stopping you from booting the Pi off an SD and just backing up the ap...
by bjtheone
Wed Nov 24, 2021 7:37 pm
Forum: Beginners
Topic: Do I need 8 Gb or will 4 Gb suffice?
Replies: 5
Views: 216

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

A 4GB Pi4B should be able to handle that. If it doesn't, then you can get an 8GB one and be left with a 4GB model for....other projects. The biggest issue will be the browser. Unless you're "tab happy" or the browser is a poorly written memory hog, 4GB should be plenty. The "or"...
by bjtheone
Wed Nov 24, 2021 2:59 pm
Forum: Off topic discussion
Topic: Cronjob to delete files
Replies: 6
Views: 561

Re: Cronjob to delete files

jahboater wrote:
Tue Nov 23, 2021 11:05 pm

Code: Select all

rm -rf <directory>
That is not a command I would offer, without providing the usual disclaimers and cautions, thought is is somewhat less harmful than "sudo rm -rf <directory>"
by bjtheone
Fri Nov 19, 2021 4:53 pm
Forum: Troubleshooting
Topic: Abnormal performance
Replies: 10
Views: 328

Re: Abnormal performance

Compared to any youtube video that shows any rpi4 working incredibly better than mine. I insist that I can't even scroll a text file of less than 100 lines without it seeming to run at 1 frame per second. Of course, opening the browser and scrolling through simple pages or checking email is out of ...
by bjtheone
Wed Nov 17, 2021 4:43 pm
Forum: General discussion
Topic: Second opinion on this circuit please
Replies: 29
Views: 754

Re: Second opinion on this circuit please

My suggestion is to clearly articulate what your requirements and constraints are. There may be a way to achieve what you want without using a separate relay board. I am intriged by your desire for an emergency kill switch. Are you planning on using the Pi to control something that requires such a f...

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