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by X-Gen
Fri Feb 07, 2020 9:30 am
Forum: General discussion
Topic: Raspberry Pi and PCIE port?
Replies: 11
Views: 966

Re: Raspberry Pi and PCIE port?

The root complex on BCM2711 uses a PCIe gen 2.0 speed link with x1 width, so 5GT/s. That's enough to run a GT 1030 with 384 Cuda Cores; would be an awesome graphical increase in performance. It probably could run a GTX 1050, or 1060 or higher, but they will be PCIE bottlenecked (unless you're minin...
by X-Gen
Fri Feb 07, 2020 9:26 am
Forum: General discussion
Topic: Power Supply for multiple RAPI4B+
Replies: 23
Views: 4480

Re: Power Supply for multiple RAPI4B+

I'd use these LED strip PSUs: https://www.amazon.com/dp/B06XK2DDW4/ref=psdc_10967101_t1_B06XK3X3PW Depending on how many Pis (counting 10W peak per pi) the above $19 psu is good for 10 Raspberry Pis (15-20 if you push it) I power a 7-unit (1 Pi3b+, 6 Pi4 4GB) cluster with a 5V power supply: https:/...
by X-Gen
Fri Feb 07, 2020 9:17 am
Forum: The MagPi
Topic: Coding book, from beginning to intermediate
Replies: 12
Views: 4210

Re: Coding book, from beginning to intermediate

Wireframe and some of the Pi tutorials require PC's. Of course coding games is probably the most complex things that can be coded. Optimising games or AI in assembler is complex, going to take years? I'm refusing to learn that in Arm6/7 and I'm only going to learn ARMv8 assembly. Even then it might...
by X-Gen
Sat Feb 01, 2020 6:21 am
Forum: The MagPi
Topic: Coding book, from beginning to intermediate
Replies: 12
Views: 4210

Coding book, from beginning to intermediate

Would be nice to have some code book ramp up from the basics (installation, syntaxis) into some intermediate stuff (assembly optimizations)... start with a hello world, (probably in python), as well as code some classic games in a variety of languages; ending the book in a few examples on how to opt...
by X-Gen
Wed Jan 29, 2020 12:39 am
Forum: General discussion
Topic: pi zero w in quantities of 10...50
Replies: 116
Views: 27081

Re: pi zero w in quantities of 10...50

Is $15 for a ZeroWH really such a horrendous price? You get a lot for that price. Tbh if we were to change the one per customer limit for the Zero, we would do it by increasing the price, so arguing about it is a zero benefit game. Why not sell the Pi Zero W at that price instead? A lot of people r...
by X-Gen
Wed Jan 29, 2020 12:27 am
Forum: General discussion
Topic: Raspberry pi zero and battery
Replies: 6
Views: 368

Re: Raspberry pi zero and battery

It's easier to use a 12V to 5V DC buck converter to power the Pi from.
It's cheap, and provides enough amps to run a good 5 or 10 of them in parallel if need be.

Most buck converters also accept 2 Li ions in series (7,2V) as input voltage.
by X-Gen
Tue Jan 28, 2020 11:23 pm
Forum: General discussion
Topic: Raspberry Pi and PCIE port?
Replies: 11
Views: 966

Re: Raspberry Pi and PCIE port?

For PCIE, all one needs is a PCIE 2.0 x4 port for up to a GTX 1060 performance, or a 3.0 x4 port, for graphics to run smoothly up till about an RTX 2060 Super / RTX 2070, or AMD equivalent. A x4 port could potentially still get 90% performance out of an RTX 2080 Ti (the fastest consumer GPU, save fo...
by X-Gen
Tue Jan 28, 2020 12:46 am
Forum: General discussion
Topic: Not able to change framebuffer_depth with latest Raspbian on 3B+
Replies: 7
Views: 435

Re: Not able to change framebuffer_depth with latest Raspbian on 3B+

I heard most TFT/LCD panels only work at 12 bit anyway? then you heart nonsens! No, actually, Most video content is encoded at 8 bit, though some higher end video encoding is done at 10 bit. I guess the bit value mentioned is brightness settings, rather than color settings. But yea, most LCDs of th...
by X-Gen
Tue Jan 28, 2020 12:34 am
Forum: General discussion
Topic: Power Supply for multiple RAPI4B+
Replies: 23
Views: 4480

Re: Power Supply for multiple RAPI4B+

Would something like this be enough for a cluster of 4 RPI4B? https://www.amazon.com/dp/B00OQ19QYA?aaxitk=NitD-d0STZo2YJ3.JhjLOg&pd_rd_i=B00OQ19QYA&pf_rd_p=591760d1-6468-480f-9b10-0ee9c85706fd&hsa_cr_id=8738474010501&sb-ci-n=asinImage&sb-ci-v=https%3A%2F%2Fimages-na.ssl-images-amazon.com%2Fimages%2...
by X-Gen
Tue Jan 28, 2020 12:31 am
Forum: General discussion
Topic: Power Supply for multiple RAPI4B+
Replies: 23
Views: 4480

Re: Power Supply for multiple RAPI4B+

I'd use these LED strip PSUs:

https://www.amazon.com/dp/B06XK2DDW4/re ... B06XK3X3PW

Depending on how many Pis (counting 10W peak per pi) the above $19 psu is good for 10 Raspberry Pis (15-20 if you push it)
by X-Gen
Tue Jan 28, 2020 12:30 am
Forum: General discussion
Topic: Power Supply for multiple RAPI4B+
Replies: 23
Views: 4480

Re: Power Supply for multiple RAPI4B+

duplicate
by X-Gen
Tue Jan 28, 2020 12:15 am
Forum: General discussion
Topic: Raspberry Pi and PCIE port?
Replies: 11
Views: 966

Raspberry Pi and PCIE port?

How viable is it to find a Raspberry Pi (variant) with a PCIE expansion port, to plug an external GPU on? From experience with x86 motherboards, the more pcie lanes are laid out on the board (to be used), the more expensive the motherboard. So I'm not expecting a singleboard PC with these features, ...
by X-Gen
Sun Jan 26, 2020 5:37 pm
Forum: General discussion
Topic: How to control one Pi from another over Ethernet?
Replies: 36
Views: 1765

Re: How to control one Pi from another over Ethernet?

Too bad I hit a limitation. I use a VNC program, that allows me to act as a server, and also found a 'viewer' program. Sadly, I'm able to see my Pi's desktop on an android device, but I'm not able to do the reverse (have my Pi control the android device; which is what I need it for). There's only on...
by X-Gen
Sun Jan 26, 2020 5:17 pm
Forum: General discussion
Topic: Underclocking to unbelievable amounts
Replies: 4
Views: 546

Re: Underclocking to unbelievable amounts

I used to start Ubuntu on an x86 laptop, and a 1,4Ghz CPU is recommended, but anything under 1Ghz gives errors. I know for sure that Raspbian can do less, because the Zero runs at 800Mhz (not overclocked), and boots the GUI just fine. Do know that most of your power saving features come from undervo...
by X-Gen
Sun Jan 26, 2020 5:12 pm
Forum: General discussion
Topic: Not able to change framebuffer_depth with latest Raspbian on 3B+
Replies: 7
Views: 435

Re: Not able to change framebuffer_depth with latest Raspbian on 3B+

I'm wondering if setting it to 16bit works?
I heard most TFT/LCD panels only work at 12 bit anyway?
by X-Gen
Sun Jan 26, 2020 5:04 pm
Forum: Raspbian
Topic: Chromium hangs after 4-5 hours of work
Replies: 5
Views: 362

Re: Chromium hangs after 4-5 hours of work

For anything below 1GB of RAM, not even Firefox is good enough anymore. OK for 1 tab, but bad for multi tabs.
by X-Gen
Sun Jan 26, 2020 5:02 pm
Forum: General discussion
Topic: Low latency video?
Replies: 17
Views: 1310

Re: Low latency video?

the best audio codec for low latency is Opus. On average 50% better than Ogg Vorbis, and 100-250% better than MP3.
Video codecs, I would presume h.264, or VP9 in case the Pi has enough power to en/decode it
by X-Gen
Sun Jan 26, 2020 4:32 pm
Forum: Raspbian
Topic: From a script add text to a file that needs SU access
Replies: 3
Views: 196

Re: From a script add text to a file that needs SU access

Did you try making the script executable?

Code: Select all

sudo chmod +x addtxt.sh
You can also find this option by right clicking and selecting properties in the GUI
by X-Gen
Tue Jan 21, 2020 3:50 am
Forum: General discussion
Topic: Display a video on a LED matrix
Replies: 7
Views: 578

Re: Display a video on a LED matrix

Sounds like you've got more of a 'icon' resolution than an actual video resolution. Each color pixel you need to extract, is actually a block of 40x30 pixels or so... I doubt RGB values really matter there. I don't know how fast the GPIO pins will transfer data, but you could write your own .avi to ...
by X-Gen
Tue Jan 21, 2020 3:44 am
Forum: Off topic discussion
Topic: PCB Engineering - Legal side questions
Replies: 10
Views: 1774

Re: PCB Engineering - Legal side questions

The older items get, the less likely you'll be slapped with a copyright claim. Especially for low volumes, or personal use. But if you do sell items, and make the boards yourself, use a different wiring diagram, board layout, different caps (more modern), so it'll look like an entirely new device. L...
by X-Gen
Tue Jan 21, 2020 3:39 am
Forum: General discussion
Topic: 64bit and hardware accelerated video?
Replies: 31
Views: 2766

Re: 64bit and hardware accelerated video?

I don't own a 4B with 4GB of RAM, but does it use the same amount as Windows (3,3-3,6GB), or does it use the entire 4GB? And if not, does following command work on Raspbian?: sudo sudo apt-get install linux-headers-server linux-image-server linux-server it should enable 32bit operating systems to su...
by X-Gen
Tue Jan 21, 2020 3:29 am
Forum: General discussion
Topic: Access internet only from USB 4g dongle.
Replies: 5
Views: 272

Re: Access internet only from USB 4g dongle.

Just remove the ethernet cable...
by X-Gen
Tue Jan 21, 2020 3:26 am
Forum: General discussion
Topic: Which distro for a RPi1B 512MB for decent Wikipedia web browsing?
Replies: 11
Views: 638

Re: Which distro for a RPi1B 512MB for decent Wikipedia web browsing?

Yes, I would second (third, fourth) Netsurf. I would also overclock that Pi CPU and RAM by a bit. Since you're probably running at 480 pixels or lower, I would also set the VRAM to 24MB (it should work with 20MB, but not guaranteed). 32MB if you're running 1080p. And if the USB port is still availab...
by X-Gen
Tue Jan 21, 2020 3:20 am
Forum: General discussion
Topic: Future of raspberry pi - software related
Replies: 382
Views: 29921

Re: Future of raspberry pi - software related

- Automatically turn off BT, when no devices are connected or configured; and have the start bar program take care of the BT to be on or off, and devices to be attached and configured. - Disable Wifi when an Ethernet cable is plugged in (saves power). - Allow monitor resolution changes on the fly - ...
by X-Gen
Mon Jan 20, 2020 12:50 am
Forum: General discussion
Topic: How to control one Pi from another over Ethernet?
Replies: 36
Views: 1765

Re: How to control one Pi from another over Ethernet?

If displaying a pi from one command, was so easy,
What prevents one from displaying all the pis in the world?

There must be some sort of difficulty involved in the setup, or one could eg: be snooping off someone else's activity online!

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