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by Burngate
Fri May 24, 2019 5:26 pm
Forum: Troubleshooting
Topic: Pi hardware problem?
Replies: 4
Views: 109

Re: Pi hardware problem?

deepakdeshp wrote:
Fri May 24, 2019 5:24 pm
Is the warning on the pi board LEDs. I run it as headless.
Red LED goes out when the incoming voltage is too low.
by Burngate
Thu May 23, 2019 8:53 am
Forum: Off topic discussion
Topic: [FIXED] Ego Search / Own Posts failing
Replies: 35
Views: 1160

Re: Ego Search / Own Posts failing

... but I bet they said a few things under their breath.
Like ... "can't he just leave us alone to get on with it, instead of wasting our time answering e-mails!"
by Burngate
Wed May 22, 2019 5:33 pm
Forum: Off topic discussion
Topic: ARM, Broadcom pull the plug on Huawei
Replies: 14
Views: 534

Re: ARM, Broadcom pull the plug on Huawei

jamesh wrote:
Wed May 22, 2019 4:25 pm
... the unintelligent occupant of the White House ...
A good proportion of the US population voted for their current president, and are presumably happy with their choice, even if the more vociferous minority don't like it.
but, do we have to have politics brought in here?
by Burngate
Wed May 22, 2019 5:07 pm
Forum: Beginners
Topic: Small part fell off my pi
Replies: 20
Views: 527

Re: Small part fell off my pi

Brandon92 wrote:
Wed May 22, 2019 10:33 am
However I'm not so sure if this is good for a headphone itself if you don't use that capacitor.
Yet one more thing I don't know. The list just keeps growing.
And I don't intend experimenting with this, 'cos I like my sound through big speakers!
by Burngate
Wed May 22, 2019 9:23 am
Forum: Beginners
Topic: Small part fell off my pi
Replies: 20
Views: 527

Re: Small part fell off my pi

No, actually, I'm not sure. At least in the old days 47μF was far too big for ceramic, but now it seems 47μF in case size 3216 is available as multilayer ceramic as well as tantalum, etc. My point still stands: whatever you plug into this shouldn't be feeding anything back into the Pi, and won't dam...
by Burngate
Tue May 21, 2019 5:03 pm
Forum: Beginners
Topic: Small part fell off my pi
Replies: 20
Views: 527

Re: Small part fell off my pi

Without C83, 6v into the left channel will end up on the output of U11, and probably kill it. As long as it can supply 60mA at that voltage through R17. But with C83 in the way, that cap will be reverse-biased and will act like a short circuit, so the end result will be the same. TL;DR If the op doe...
by Burngate
Tue May 21, 2019 9:56 am
Forum: Beginners
Topic: Small part fell off my pi
Replies: 20
Views: 527

Re: Small part fell off my pi

Do NOT short the connection. C58 is a DC blocking capacitor and is necessary to prevent possible damage to the Pi, and even in the absence of damage it may be necessary for an undistorted signal. I'm not convinced on either point. The jack can short the left audio to ground as the plug it's being i...
by Burngate
Tue May 21, 2019 9:08 am
Forum: Troubleshooting
Topic: Dead RPi 3 B+ after short circuit pin 1 and 2 of GPIO
Replies: 15
Views: 4582

Re: Dead RPi 3 B+ after short circuit pin 1 and 2 of GPIO

Kazemiprince wrote:
Mon May 20, 2019 4:05 pm
Close to regulators I can measure 3.3 v on a resistor
That'll be the supply for the audio, 3v3A, not the main 3v3 for the logic.
by Burngate
Fri May 17, 2019 9:46 am
Forum: Troubleshooting
Topic: Raspberry Pi 3 No LEDs light up.
Replies: 1
Views: 62

Re: Raspberry Pi 3

Unfortunately your Pi is unrepairably dead. "the middle silver chip" - the "works" of the Pi - has in some way been damaged. To avoid the same thing happening again to a new Pi, you will have to go through what you did to this one, to find out what you did wrong. Most often, it's mistreating the GPI...
by Burngate
Thu May 16, 2019 6:03 pm
Forum: Other programming languages
Topic: General language discussion.
Replies: 151
Views: 2725

Re: General language discussion.

Anyway, I'm envious, when I was 5 a computer might not have fit in the house, the first commercial IC's became available, the inventor of the vacuum tube died, FORTRAN IV was created, ECMA was established (Yay, Javascript!). Quizz: What year was I 5 years old? Not gonna answer that, but you're just...
by Burngate
Wed May 15, 2019 6:25 pm
Forum: Off topic discussion
Topic: is the pi worth it?
Replies: 103
Views: 3723

Re: is the pi worth it?

Just a quick thought, about this Backwards compatibility / Scared of the future / landfill business. Front page on Monday, picture of Soyuz, taken on 1B+ & camera. If we're thinking of losing backwards compatability, then anything written for post-3B+ won't work on the ISS. And landfill is a long wa...
by Burngate
Wed May 15, 2019 11:16 am
Forum: General discussion
Topic: RPi high school lab. B+ issues. B no issues.
Replies: 24
Views: 1049

Re: RPi high school lab. B+ issues. B no issues.

Paranoia raising its head ... do you keep a note of which students use which machines?
by Burngate
Wed May 15, 2019 11:13 am
Forum: Off topic discussion
Topic: is the pi worth it?
Replies: 103
Views: 3723

Re: is the pi worth it?

Gavinmc42 wrote:
Tue May 14, 2019 11:48 pm
Backwards compatibility are only for those scared of the future.
I don't believe I'm scared of the future, but I also don't want to send last year's model to landfill just because there's a bright new shiny in the shops.
by Burngate
Wed May 15, 2019 10:48 am
Forum: General discussion
Topic: Why can't my article be accepted?
Replies: 7
Views: 305

Re: Why can't my article be accepted?

I'd try posting it again, and see what happens. And maybe a brief synopsis on this thread.
Things get lost. Black holes lose information.
by Burngate
Wed May 15, 2019 10:43 am
Forum: Automation, sensing and robotics
Topic: I want to detect a flash of small pcb chip
Replies: 12
Views: 391

Re: I want to detect a flash of small pcb chip

Or maybe they're just not very good at writing English, or expressing their wishes coherently and politely. I can read "Just tell me how to ..." as an abrupt demand, or as a plea for simplicity - many of us here are very good at waffling, but less good at the clear guidance required. Me included, wh...
by Burngate
Wed May 15, 2019 8:49 am
Forum: Other projects
Topic: Powering the Pi and touchscreen
Replies: 12
Views: 318

Re: Powering the Pi and touchscreen

If that's best for you, then Yes. Pins 1 or 2 for 5v and pin 6 for ground can work in either direction - I think you mean pins 2 and 4. Pin 1 is 3v3 and placing 5v on that will instantly and permanently destroy a Pi. Thankyou; I've corrected it, above. And ... don't put 5v on pin 1 ... using either...
by Burngate
Tue May 14, 2019 3:56 pm
Forum: Other projects
Topic: Powering the Pi and touchscreen
Replies: 12
Views: 318

Re: Powering the Pi and touchscreen

If that's best for you, then Yes. Pins 2 or 4 for 5v (note my edit - see Imperf3kt below) and pin 6 for ground can work in either direction - they're just bits of metal - so feeding power into those pins will provide power to both screen and Pi, as long as you can physically mount everything one on ...
by Burngate
Mon May 13, 2019 10:44 am
Forum: HATs and other add-ons
Topic: poe hat sticker on 4-pin connector
Replies: 1
Views: 114

Re: poe hat sticker on 4-pin connector

If you're not using the PoE hat, leave it on - just extra protection.

But for the PoE hat, just pushing the pins through it could leave sticky gunk coating the pin surface which could interfere with the connection.
So remove it.
by Burngate
Mon May 13, 2019 10:25 am
Forum: Troubleshooting
Topic: RPI 2 no HDMI signal
Replies: 4
Views: 126

Re: RPI 2 no HDMI signal

"only for a few seconds" is like an eternity for silicon.

The fan was hoping for 5v but only got 1v7, didn't start rotating but tried to by taking as much current as it could.
That looked like a short-circuit to the regulator chip, and it promptly died.
by Burngate
Mon May 13, 2019 9:41 am
Forum: Beginners
Topic: MicroSD card not enough capacity
Replies: 5
Views: 205

Re: MicroSD card not enough capacity

The capacity stated on the labelling and packaging is a nominal figure. There are very few manufacturer rejects of flash memory cards. Faulty areas are mapped out during testing. Each card has its own number of defective areas so even cards from the same silicon wafer can have slightly different ac...
by Burngate
Mon May 13, 2019 9:18 am
Forum: Camera board
Topic: why do I have purple pics
Replies: 9
Views: 371

Re: why do I have purple pics

I have no experience with that camera, but it uses the same sensor as the Official camera (and also the camera you tried a couple of years ago) so it should work. As you found out then ( https://www.raspberrypi.org/forums/viewtopic.php?f=43&t=166352&p=1098583#p1099032 ) the 3v3 supply to the camera ...
by Burngate
Sun May 12, 2019 5:57 pm
Forum: General programming discussion
Topic: A Final Fibonacci Challenge
Replies: 43
Views: 1209

Re: A Second Age of Personal Computing

Whether Turing's completeness has anything to do with personal computing, I'm not sure, but one thing I learnt some years ago is that specifying an "infinite tape with storage cells" is also lacking in meaning. There are many infinities, the lowest being (probably) that of integers and similar, and ...
by Burngate
Sun May 12, 2019 5:15 pm
Forum: Beginners
Topic: Can't get RGB LED to light using Pi 3 and Python/GPIO
Replies: 11
Views: 279

Re: Can't get RGB LED to light using Pi 3 and Python/GPIO

As always, experience is better than a datasheet! According to the sheet, the blue segment should have Vf between 3.0 and 3.4v, the same as the green one. However, the graphs there-in tell a more complex story The blue one for example: If-Vf Blue.png As shown, it isn't a straight-forward horizontal ...

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