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by rhildinger
Wed Feb 12, 2020 5:39 pm
Forum: General discussion
Topic: Heat torture testing Pi4
Replies: 37
Views: 2021

Re: Heat torture testing Pi4

ganzgustav22 wrote: ↑
Wed Feb 12, 2020 3:24 pm
 Now at 60.5C ambient, 142C CPU and 151.7C PMIC it just rebooted on it's own. Still working fine after the reboot.
151.7C? You're creeping up on the melting point of solder. I'm surprised you haven't had some sort of permanent hardware failure at that temp...
by rhildinger
Tue Feb 04, 2020 4:24 pm
Forum: General discussion
Topic: Pi 4 delivering power on HDMI port (is this expected?)
Replies: 5
Views: 851

Pi 4 delivering power on HDMI port (is this expected?)

I was just playing around with a 5" HDMI LCD screen connected to the Pi 4 via HDMI, and was surprised to see that the Pi4 was delivering power to the LCD directly from the HDMI port. I was under the impression that only "MHL" hdmi ports delivered power, and the ports on the Pi4 have not been adverti...
by rhildinger
Tue Feb 04, 2020 4:08 pm
Forum: General discussion
Topic: GPU overclocking.
Replies: 1
Views: 751

Re: GPU overclocking.

Very cool! Thanks for keeping us posted!
by rhildinger
Fri Jan 10, 2020 3:29 pm
Forum: General discussion
Topic: bit banging at high frequency
Replies: 5
Views: 430

Re: bit banging at high frequency

Take a look at the following libraries for examples of using DMA to perform accurate high-speed bitbanging:

https://github.com/jgarff/rpi_ws281x

https://github.com/hzeller/rpi-rgb-led-matrix

-Robert
by rhildinger
Tue Oct 08, 2019 9:20 pm
Forum: General discussion
Topic: When will the Full KMS driver for Raspberry Pi 4 be available?
Replies: 5
Views: 1443

Re: When will the Full KMS driver for Raspberry Pi 4 be available?

How might one educate oneself on the whole KMS vs FKMS driver system?
by rhildinger
Mon Oct 07, 2019 8:24 pm
Forum: General discussion
Topic: latest rpi-update 2.5ghz with 4B 4g
Replies: 47
Views: 8398

Re: latest rpi-update 2.5ghz with 4B 4g

Yes, the latest firmware opened up a little more overclock room. I have two boards that can overclock to 2.147GHz stable, and one that won't. I question the part about overclocking the GPU to 750 MHz though. I can set that value in config.txt and the board will boot, but "vcgencmd measure_clock core...
by rhildinger
Tue Jul 02, 2019 9:06 pm
Forum: General discussion
Topic: Raspberry Pi 4B - Mouse Cursor lag in 4k
Replies: 9
Views: 1671

Re: Raspberry Pi 4B - Mouse Cursor lag in 4k

I think by default the HDMI ports drive 4K monitors at only 30Hz, which would definitely seem like cursor lag. I think there is a boot option that you have to set that enables 4K/60Hz...
by rhildinger
Tue Jul 02, 2019 9:01 pm
Forum: General discussion
Topic: Just received my RPi4b/4GB - no HDMI output!!!
Replies: 86
Views: 41168

Re: Just received my RPi4b/4GB - no HDMI output!!!

Have you tried simply erasing the SD card and re-writing the buster image to it and placing it in the RPi4 first?
by rhildinger
Wed Jul 11, 2018 9:21 pm
Forum: General discussion
Topic: Setting a static IP address from SD card before boot
Replies: 24
Views: 23814

Re: Setting a static IP address from SD card before boot

Three possible ways. Use a Ubuntu/Debian PC to edit the file. For the sake of completeness, there is actually a 4th way to edit files on the root partition of a Pi SD card, but this method requires $. You can install an extFS driver for Mac that will allow it read and write to Linux ext partitions:...
by rhildinger
Mon May 21, 2018 8:27 pm
Forum: General discussion
Topic: Battery power / power display in termial
Replies: 3
Views: 443

Re: Battery power / power display in termial

drgeoff is right. You would need an i2c voltmeter to act as the battery monitor, and then you would have to derive a voltage to charge mapping, since there is no way to actually measure the charge level of a battery.
by rhildinger
Mon Apr 30, 2018 8:05 pm
Forum: Astro Pi
Topic: Replica Astro Pi Case still available?
Replies: 11
Views: 8853

Re: Replica Astro Pi Case still available?

Looks like your site is down again. Did someone hack you again?
by rhildinger
Mon Apr 16, 2018 2:58 pm
Forum: General discussion
Topic: Driving a single WS2811/WS2812 SMD, not a strip
Replies: 8
Views: 1731

Re: Driving a single WS2811/WS2812 SMD, not a strip

Honestly, if you want these 5V addressable LED's to work reliably and consistently, you're going to have to use a level converter to bump the GPIO output from 3.3V to 5V. It's a pain I know, but every other method is essentially a work around that will work for some LEDs but not for others.
by rhildinger
Thu Apr 05, 2018 9:51 pm
Forum: General discussion
Topic: RPi 3B+ gigabit ethernet bad download speeds.
Replies: 193
Views: 85004

Re: RPi 3B+ gigabit ethernet bad download speeds.

It wasn't my intention to make a trollbait post, but I guess that's the way it came out....[sigh]... sorry about that...
by rhildinger
Thu Apr 05, 2018 7:41 pm
Forum: General discussion
Topic: RPi 3B+ gigabit ethernet bad download speeds.
Replies: 193
Views: 85004

Re: RPi 3B+ gigabit ethernet bad download speeds.

resiakt (tkaiser),

In all honesty, your posts are becoming childishly tiresome and pointless. What good information you are adding to the thread is being outweighed by your obsession over nonexistent censorship. Please, give it a rest...

-Robert
by rhildinger
Thu Mar 29, 2018 8:35 pm
Forum: Astro Pi
Topic: Replica Astro Pi Case still available?
Replies: 11
Views: 8853

Re: Replica Astro Pi Case still available?

What are the differences between the APEM 104350003 and APEM 8632A switches, besides one being much more expensive than the other? Do they have the same travel/feel? Are the 104350003 switches so much more expensive simply because of their higher reliability rating, or is there something else? Just ...
by rhildinger
Thu Mar 29, 2018 4:07 pm
Forum: General discussion
Topic: Sandisk A2 class micro sd card the Pi performance king?
Replies: 3
Views: 1026

Re: Sandisk A2 class micro sd card the Pi performance king?

Doesn't appear to be in general availability yet...
by rhildinger
Thu Mar 29, 2018 2:57 pm
Forum: General discussion
Topic: Sandisk A2 class micro sd card the Pi performance king?
Replies: 3
Views: 1026

Sandisk A2 class micro sd card the Pi performance king?

Sandisk has released an A2 application class micro sd card that at least on paper will be the undisputed performance king for the Pi. Only trouble is, it costs as much as 10 Pi 3's and is way overkill for the majority of people. Specs are very impressive: 400GB, A2 application class (4000/2000 minim...
by rhildinger
Thu Mar 22, 2018 7:12 pm
Forum: Astro Pi
Topic: Replica Astro Pi Case still available?
Replies: 11
Views: 8853

Replica Astro Pi Case still available?

I noticed that the website for the Replica Astro Pi flight case is down ( www.astropicase.com ). Are these cases no longer available, or is this just a temporary glitch?
by rhildinger
Tue Mar 20, 2018 4:02 pm
Forum: General discussion
Topic: 3B+ PoE pin description / documentation
Replies: 28
Views: 16399

Re: 3B+ PoE pin description / documentation

Not another HAT, but certainly another compatible add-on board. HAT is a spec which an includes EEPROM for identification. Since the EEPROM would be on the same pins and the same address, you can't really stack them and expect things to 'just work'. Ah, yes - thanks for that clarification! I always...
by rhildinger
Tue Mar 20, 2018 3:51 pm
Forum: General discussion
Topic: 3B+ PoE pin description / documentation
Replies: 28
Views: 16399

Re: 3B+ PoE pin description / documentation

Judging strictly from the early pre-release photos posted on pishop.us, the 40 pin header section looks like it is set up the same way as the sense hat. On the underside of the POE hat board is a surface mount 40 pin header block that allows pass through of pins, so if you stack a double length head...
by rhildinger
Mon Mar 19, 2018 10:11 pm
Forum: General discussion
Topic: RPi 3B+ Heat/CPU related improvements.
Replies: 50
Views: 18417

Re: RPi 3B+ Heat/CPU related improvements.

jamesh wrote: ↑
Mon Mar 19, 2018 3:48 pm
 I've already had one cockwomble on the blog stating I need psychiatric help, so I'm pretty much prepared.
"Cockwomble" is now my favorite word. I shall be overusing it with impunity to annoy my coworkers...
by rhildinger
Mon Mar 19, 2018 7:49 pm
Forum: General discussion
Topic: 3B+ PoE pin description / documentation
Replies: 28
Views: 16399

Re: 3B+ PoE pin description / documentation

It seems PiShop.US is jumping the gun a bit, I don't believe they know they actual price, as the POE HAT isn't actually launched yet. but yes, at least they are not confusing it with an older POE solution for the PI. I wish we could see the back of the board, so we could see how much electronics th...
by rhildinger
Mon Mar 19, 2018 4:48 pm
Forum: General discussion
Topic: 3B+ PoE pin description / documentation
Replies: 28
Views: 16399

Re: 3B+ PoE pin description / documentation

pishop.us has the POE hat up on their website for $49.95, though not in stock yet. Is that going to be the actual sale price of the POE hat, or is that an early misprint from pishop.us? The price seems a little high...
by rhildinger
Wed Feb 08, 2017 8:22 pm
Forum: Compute Module
Topic: It you want/need I/O board only
Replies: 8
Views: 1890

Re: It you want/need I/O board only

My fear was that the deal might be too good to be true, since the cost through digikey was so much less than through any other vendor. I thought digikey may have made a stocking mistake or something similar and had mislabelled a bunch of older CMIO boards for sale as v3 boards. Glad to see that I ha...
by rhildinger
Tue Feb 07, 2017 5:39 pm
Forum: Compute Module
Topic: It you want/need I/O board only
Replies: 8
Views: 1890

Re: It you want/need I/O board only

Thanks for the heads up! These are also available from the U.S. digikey website for $37 (vs. $120 from alliedelec.com): http://www.digikey.com/products/en/development-boards-kits-programmers/evaluation-boards-expansion-boards/797?k=compute%20module&newproducts=1 I ordered one, let's hope it's the ri...

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