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by jcyr
Fri Aug 16, 2019 9:18 pm
Forum: General discussion
Topic: When can we expect USB boot for the Pi 4?
Replies: 56
Views: 1983

Re: When can we expect USB boot for the Pi 4?

Between you and all the RPT/RPF people, which do you think knows their business best ? Hint: It's not you :roll: PeterO Sarcasm: Hostility disguised as humor. Gotta love it! So I ask a slightly different question. Why do you think you know RPT/RPF business better than all the RPT/RPF people ? (beca...
by jcyr
Fri Aug 16, 2019 5:54 pm
Forum: General discussion
Topic: When can we expect USB boot for the Pi 4?
Replies: 56
Views: 1983

Re: When can we expect USB boot for the Pi 4?

I do question prioritizing network boot over USB boot though. I can only guess at the rationale but it seems a swing towards catering to commercial interests rather than the needs of your 'average user'? Between you and all the RPT/RPF people, which do you think knows their business best ? Hint: It...
by jcyr
Fri Aug 16, 2019 4:25 pm
Forum: General discussion
Topic: When can we expect USB boot for the Pi 4?
Replies: 56
Views: 1983

Re: When can we expect USB boot for the Pi 4?

I do question prioritizing network boot over USB boot though. I can only guess at the rationale but it seems a swing towards catering to commercial interests rather than the needs of your 'average user'?
by jcyr
Thu Aug 15, 2019 1:09 am
Forum: General discussion
Topic: rtorrent - Caught Segmentation fault
Replies: 7
Views: 181

Re: rtorrent - Caught Segmentation fault

ProDigit wrote:
Thu Aug 15, 2019 1:07 am
Since torrents usually address multiple small file bits, the SD card may have a hard time with writing and reading at the same time.
No way this should cause a segfault!
by jcyr
Thu Aug 15, 2019 1:06 am
Forum: General discussion
Topic: Official Keyboard and mouse
Replies: 33
Views: 708

Re: Official Keyboard and mouse

At home, both of us use Unicomp keyboards The finest keyboards I've ever bought, I have one in each work area of my home office connected to KVM's so Unicomp's drive 4 PC's and 3 Pi's. https://www.pckeyboard.com/ Why purchase an imitator when you can buy the original “Model M”. We have produced the...
by jcyr
Wed Aug 14, 2019 6:25 pm
Forum: General discussion
Topic: WiringPi to be deprecated?
Replies: 12
Views: 1011

Re: WiringPi to be deprecated?

epoch1970 wrote:
Wed Aug 14, 2019 5:41 pm
I don’t know the gpio utilities landscape that much, but perhaps a small team can coordinate and pick-up maintenance and packaging?
There are a couple of equally capable and maintained alternatives.
by jcyr
Tue Aug 13, 2019 4:26 pm
Forum: General discussion
Topic: Pi4 as Desktop computer
Replies: 130
Views: 9200

Re: Pi4 as Desktop computer

You seem to be saying that greater than 50% (i.e. A Majority) of devs working for Google means you won't use the software. PeterO Google == Microsoft in the 80s... I try to avoid all things where Google has influence. I still have separate Gmail account serving as a junk mail honeypot and it seems ...
by jcyr
Tue Aug 13, 2019 1:17 pm
Forum: General discussion
Topic: Pi4 as Desktop computer
Replies: 130
Views: 9200

Re: Pi4 as Desktop computer

jamesh wrote:
Tue Aug 13, 2019 6:34 am
What has the percentage got to do with it? Only takes one....you should not be using Linux if you are so paranoid about Google's work.
Huh?
by jcyr
Mon Aug 12, 2019 8:36 pm
Forum: General discussion
Topic: Pi4 as Desktop computer
Replies: 130
Views: 9200

Re: Pi4 as Desktop computer

Worth doing a search over the Linux kernel codebase for contributers Google email addresses... Certainly not the majority, nor the core devs... Unlike Chromium. Chromium is open source, so should be entirely free of bad stuff. The bad stuff is Google and wherever they extend their tentacles.
by jcyr
Mon Aug 12, 2019 4:54 pm
Forum: General discussion
Topic: Pi4 as Desktop computer
Replies: 130
Views: 9200

Re: Pi4 as Desktop computer

@pica200: RPF/T care very much, that's why they give you an optimized Browser called Chromium. If you don't like that, that's your personal preference. Correct. I prefer to use a real 'desktop' computer for most daily activities. I have a special aversion to all things Google, including Chromium. W...
by jcyr
Mon Aug 12, 2019 3:56 pm
Forum: General discussion
Topic: Pi4 as Desktop computer
Replies: 130
Views: 9200

Re: Pi4 as Desktop computer

Aydan wrote:
Mon Aug 12, 2019 1:10 pm
@pica200:
RPF/T care very much, that's why they give you an optimized Browser called Chromium.
If you don't like that, that's your personal preference.
Correct. I prefer to use a real 'desktop' computer for most daily activities. I have a special aversion to all things Google, including Chromium.
by jcyr
Sun Aug 11, 2019 3:36 pm
Forum: General discussion
Topic: WiringPi to be deprecated?
Replies: 12
Views: 1011

Re: WiringPi to be deprecated?

The bcm2835 library (which I prefer to the two mentioned above) is active, well maintained, and has Pi4 support in version 1.60.

https://www.airspayce.com/mikem/bcm2835/
by jcyr
Fri Aug 09, 2019 7:12 pm
Forum: General discussion
Topic: A simple PI4 fan controller
Replies: 7
Views: 498

Re: A simple PI4 fan controller

Finally, the PCBs have arrived... versions 1 & 2. https://jeancyr.com/pifan/0.png Parts mounted. Version 2 has an additional resistor to shutdown the fan when the Pi is halted as well as a long tail header for pin access. https://jeancyr.com/pifan/1.png Version 1 installed https://jeancyr.com/pifan/...
by jcyr
Fri Aug 09, 2019 3:02 pm
Forum: General discussion
Topic: The Raspberry Pi 4 is fast – and hot!!!
Replies: 21
Views: 1370

Re: The Raspberry Pi 4 is fast – and hot!!!

Here is a picture of how the RPI4 cases should be designed they should be designed with ventilation ports, air enters the case heated air exits the case: https://www.seeedstudio.site/media/catalog/product/cache/ef3164306500b1080e8560b2e8b5cc0f/h/t/httpsstatics3.seeedstudio.comseeedfile2018-07bazaar...
by jcyr
Sun Aug 04, 2019 1:07 pm
Forum: General discussion
Topic: 5V 4-pin Noctua A4X10 on Raspberry Pi
Replies: 43
Views: 3185

Re: 5V 4-pin Noctua A4X10 on Raspberry Pi

R1 - Keeps CMOS gate at ground when PWM is disabled and 3V powered down. This condition happens when PI is halted, but still powered. R2 - Keeps CMOS gate at nearly 3.3V when the PI is running but PWM has not been enabled. Keeps fan at max, when Pi is running but PWM is not enabled (hi-Z). This cond...
by jcyr
Sun Aug 04, 2019 1:46 am
Forum: General discussion
Topic: 5V 4-pin Noctua A4X10 on Raspberry Pi
Replies: 43
Views: 3185

Re: 5V 4-pin Noctua A4X10 on Raspberry Pi

@sar100 I ended up with this: https://jeancyr.com/noctua-4-wire.png Oops... that 47KK resistor should be 470K. A little more complicated than I had hoped! Had to use two N channel MOSFETs (in a single package) since they invert the signal and I wanted the following outcomes: 5V is always on 3.3V sta...
by jcyr
Fri Aug 02, 2019 11:46 pm
Forum: General discussion
Topic: 5V 4-pin Noctua A4X10 on Raspberry Pi
Replies: 43
Views: 3185

Re: 5V 4-pin Noctua A4X10 on Raspberry Pi

I tested the pwm signal from the pi to the fan. I don't see a 5V pullup just the 3V You wouldn't see the 5V with the PWM active, you'd only see it with the PWM pin in high impedance mode. Disconnect the PWM signal, then measure the voltage on the motor's PWM input side. You should then see whatever...
by jcyr
Fri Aug 02, 2019 11:16 pm
Forum: General discussion
Topic: 5V 4-pin Noctua A4X10 on Raspberry Pi
Replies: 43
Views: 3185

Re: 5V 4-pin Noctua A4X10 on Raspberry Pi

I tested the pwm signal from the pi to the fan. I don't see a 5V pullup just the 3V You wouldn't see the 5V with the PWM active, you'd only see it with the PWM pin in high impedance mode. Disconnect the PWM signal, then measure the voltage on the motor's PWM input side. You should then see whatever...
by jcyr
Fri Aug 02, 2019 11:07 pm
Forum: General discussion
Topic: 5V 4-pin Noctua A4X10 on Raspberry Pi
Replies: 43
Views: 3185

Re: 5V 4-pin Noctua A4X10 on Raspberry Pi

Because the fan being used in this tread has an internal pull up that may be 3.3v or 5v , you never want to connect 5v to the pi gpio or you will damage your pi. So a transistor is used as a interface between the gpio and fan, also the fan used in the tread requires a current limiting resistor on t...
by jcyr
Fri Aug 02, 2019 10:31 pm
Forum: General discussion
Topic: 5V 4-pin Noctua A4X10 on Raspberry Pi
Replies: 43
Views: 3185

Re: 5V 4-pin Noctua A4X10 on Raspberry Pi

Because the fan being used in this tread has an internal pull up that may be 3.3v or 5v , you never want to connect 5v to the pi gpio or you will damage your pi. So a transistor is used as a interface between the gpio and fan, also the fan used in the tread requires a current limiting resistor on t...
by jcyr
Fri Aug 02, 2019 9:33 pm
Forum: General discussion
Topic: 5V 4-pin Noctua A4X10 on Raspberry Pi
Replies: 43
Views: 3185

Re: 5V 4-pin Noctua A4X10 on Raspberry Pi

Because the fan being used in this tread has an internal pull up that may be 3.3v or 5v , you never want to connect 5v to the pi gpio or you will damage your pi. So a transistor is used as a interface between the gpio and fan, also the fan used in the tread requires a current limiting resistor on t...
by jcyr
Fri Aug 02, 2019 8:08 pm
Forum: General discussion
Topic: 5V 4-pin Noctua A4X10 on Raspberry Pi
Replies: 43
Views: 3185

Re: 5V 4-pin Noctua A4X10 on Raspberry Pi

Regarding the PWM signal, I'm now using a 2N2222A transistor to drive the signal. However, Noctua does not seem to recommend an open collector design (see updated question). So the question is if I need something different than a 2N2222A... There is a recommended circuit in the manual you linked to...
by jcyr
Thu Aug 01, 2019 1:43 am
Forum: General discussion
Topic: PI4 doesn't shut down +5V & 3.3V pins after sudo shutdown now
Replies: 11
Views: 504

Re: PI4 doesn't shut down +5V & 3.3V pins after sudo shutdown now

curious, why do you want to have the 3.3v cut-off during shutdown? ( and not during reboot?) Mainly because I'd like a particular hat to draw 0 power when the system is halted. Indeed the 5V line seems to be permanently on. With the right eeprom bootloader settings I should be able to get the 3.3V ...
by jcyr
Thu Aug 01, 2019 1:26 am
Forum: General discussion
Topic: Fan header pins?
Replies: 25
Views: 1029

Re: Fan header pins?

A fresh AA battery typically has an internal resistance of about .15 ohms. You'd have to draw a significant amount of current to see a significant voltage drop. In fact, batteries are notoriously good voltage regulators for the price. The brushless fan motor would not run at 1.5V because the voltage...
by jcyr
Thu Aug 01, 2019 1:14 am
Forum: General discussion
Topic: Pi4 Cooling
Replies: 118
Views: 8429

Re: Pi4 Cooling

Ok, we can’t drive a 2-wire brushless fan motor with a high frequency PWM signal… but how about a low frequency PWM signal? Setting the PWM clock divider to a maximum value of 2048, we get an internal PWM clock frequency of 9.375kHz. Then by setting a PWM range value of 8192, we end up with a 1.14Hz...

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