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by X-Gen
Sat May 30, 2020 8:37 pm
Forum: General discussion
Topic: Need emmc drive
Replies: 14
Views: 572

Re: Need emmc drive

I've read the pi4b with the new OS, doesn't allow booting from USB anymore? We've had a number of posts recently, here and on the blog comments, that start like this. "I've read that..." and then some information that is completely wrong. Where are they reading this stuff? Are they just spammers lo...
by X-Gen
Sat May 30, 2020 7:27 am
Forum: General discussion
Topic: Need emmc drive
Replies: 14
Views: 572

Need emmc drive

I've read the pi4b with the new OS, doesn't allow booting from USB anymore? It would be awesome, if on the next version of the pi, there will be a connector for an external drive, that's not only faster, but much more reliable than microSD cards. The main issue is that slow as cards, hamper the Pi's...
by X-Gen
Mon Apr 27, 2020 10:48 pm
Forum: General discussion
Topic: Raspberry Pi and PCIE port?
Replies: 12
Views: 1536

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
Wed Apr 22, 2020 10:44 pm
Forum: The MagPi
Topic: Coding book, from beginning to intermediate
Replies: 13
Views: 5542

Re: Coding book, from beginning to intermediate

It takes years to learn just about any language. COBOL took me 10 days (of a 15 day training course). Z80 Assembler took me a while. I used to read "Programming the Z80" every night for ages. 6502 didn't take too long. ARM was fun. So few instructions with so many options. BASIC varied. I learnt ma...
by X-Gen
Fri Feb 07, 2020 9:30 am
Forum: General discussion
Topic: Raspberry Pi and PCIE port?
Replies: 12
Views: 1536

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: 32
Views: 7540

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: 13
Views: 5542

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: 13
Views: 5542

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: 29022

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: 403

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: 12
Views: 1536

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: 484

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: 32
Views: 7540

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: 32
Views: 7540

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: 32
Views: 7540

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: 12
Views: 1536

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: 1901

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: 609

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: 484

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: Raspberry Pi OS
Topic: Chromium hangs after 4-5 hours of work
Replies: 5
Views: 416

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: 2259

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: Raspberry Pi OS
Topic: From a script add text to a file that needs SU access
Replies: 3
Views: 226

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: 9
Views: 760

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: 1888

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: 3576

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...

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