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by Burngate
Sat Sep 18, 2021 9:06 am
Forum: General discussion
Topic: Difference Raspberry Pi 4 vs 4B
Replies: 7
Views: 270

Re: Difference Raspberry Pi 4 vs 4B

There's only the Pi 4B. Whoever lists a Pi 4 means Pi 4B.

Many years ago, you could get a Pi A, which was a cut-down Pi B, but now there isn't a cut-down 4B

Of course you can now get the Pi 400, which is effectively a Pi 4B with bells & whistles.
by Burngate
Mon Sep 13, 2021 5:30 pm
Forum: Troubleshooting
Topic: Low Voltage Warning - New Pi
Replies: 3
Views: 197

Re: Low Voltage Warning - New Pi

... but when I run vcgencmd measure_volts it tells me the volt is only 0.8700V. Is this normal, even under load? The voltage measured by "vcgencmd measure_volts" is one of several inside the SoC, and has little to do with the in-coming nominal 5v monitored by the PMIC to produce the low-v...
by Burngate
Wed Sep 08, 2021 8:02 am
Forum: Troubleshooting
Topic: Problem with OS and SD cards
Replies: 2
Views: 115

Re: Problem with OS and SD cards

... I formatted my SD card, I unzipped the file and put the contents into a new folder and put it in my 32 GB SD card ... Sorry - that's the wrong way to do it! What you need to do is described in https://projects.raspberrypi.org/en/projects/raspberry-pi-setting-up/2 I'm not convinced that the &quo...
by Burngate
Mon Sep 06, 2021 9:04 am
Forum: General discussion
Topic: 12v fan control with built-in cooling fan control in raspbian os
Replies: 6
Views: 1059

Re: 12v fan control with built-in cooling fan control in raspbian os

Well, I want you to use a translator. 저는 12v Noctua Fan을 가지고있습니다 최근에 나는 Raspbian Os에 CoolingFan 제어 기능이 있다는걸 알았습니다 나는 그 기능으로 내 Fan을 동작시키고 싶습니다 누가 나를 도와줘 5v팬을 사고싶지 않습니다 나는 현재 2N2222트랜지스터와 1KOhm저항, 그리고 다이오드 등을 가지고 있습니다 이것들로 조립하는 방법 등을 알려주세요 미리 감사드립니다 :D Is this any help? Mae gen i Fan Noctua 12v Yn dd...
by Burngate
Fri Sep 03, 2021 5:09 pm
Forum: General discussion
Topic: Raspberry Pi not working!
Replies: 3
Views: 223

Re: Raspberry Pi not working!

Have you looked at the sticky at viewtopic.php?f=28&t=58151?
by Burngate
Fri Aug 20, 2021 8:56 am
Forum: General
Topic: PWM audio amplifier
Replies: 7
Views: 505

Re: PWM audio amplifier

You could perhaps use an H-bridge - that's what the output stage of a class D amplifier really is - so eliminating the analogue-PWM stage of the PAM8302.
by Burngate
Thu Aug 12, 2021 8:53 am
Forum: Off topic discussion
Topic: What was your first computer?
Replies: 598
Views: 250917

Re: What was your first computer?

It could also mean that there could be someone, owning and using a Pi and asking questions here, is younger than the first Pi
by Burngate
Thu Aug 05, 2021 6:05 pm
Forum: Advanced users
Topic: Will Pi 4 likely get too hot in enclosure?
Replies: 9
Views: 616

Re: Will Pi 4 likely get to hot in enclosure?

... PVC 6"x6"x4" sealed waterproof enclosure ... large case with fan from same vendor Be aware that, since the Pi needs at least a power cable to reach it, and that needs a hole in the enclosure, it may not now be "sealed waterproof" Also, the Pi itself may be capable of sl...
by Burngate
Wed Aug 04, 2021 9:27 am
Forum: Python
Topic: GPIO goes to 2.5v
Replies: 6
Views: 378

Re: GPIO goes to 2.5v

Sorry, I had hoped that this was a common / known situation. I will do more investigation to see what the cause is and (assuming I figure it out) then post an update. No! No! No! - Common problems are boring! People here like an odd one to get the brain going, and make them feel useful! So do show ...
by Burngate
Sat Jul 31, 2021 5:11 pm
Forum: Troubleshooting
Topic: SDA reads 5v
Replies: 6
Views: 315

Re: SDA reads 5v

Brill!
by Burngate
Fri Jul 30, 2021 5:38 pm
Forum: Troubleshooting
Topic: SDA reads 5v
Replies: 6
Views: 315

Re: SDA reads 5v

.. the SDA pin (GPIO2) measures 5v on the Zero but 3.3v on the Pi3. It is still 5v even with nothing connected to that pin. It shouldn't be 5v - no GPIO should be at 5v, and if it's fed 5v it will be broken. Not only that, but both GPIOs 2 & 3 have 1k8 pulll-ups to 3v3, so if GPIO2 is at 5v, th...
by Burngate
Tue Jul 27, 2021 5:23 pm
Forum: Beginners
Topic: Shutting Pi Down - LEDs and Best Command
Replies: 9
Views: 430

Re: Shutting Pi Down - LEDs and Best Command

davidcoton wrote:
Tue Jul 27, 2021 10:05 am
I haven't checked, but on shutdown the 3V3 supply is off, so all GPIO pins will appear low, and may therefore sink a small current through the default pull-up or pull-down.
Doesn't the pull-up or -down require a fet to be on, which would require the 3v3 to be present?
by Burngate
Thu Jul 15, 2021 8:44 am
Forum: Off topic discussion
Topic: Toms Hardware / Eben Upton / Pi Cast
Replies: 21
Views: 1410

Re: Toms Hardware / Eben Upton / Pi Cast

Some other sites I visit have been fortunate in having people willing to transcribe what's been said into text - a bit like what's supposed to happen in courts. I couldn't do it myself - not enough patience, can't do shorthand (does that get taught in schools these days, or is it considered too un-w...
by Burngate
Mon Jul 12, 2021 7:27 am
Forum: Troubleshooting
Topic: Build an SDCard for a Pi0 - My Duh Moment
Replies: 1
Views: 130

Re: Build an SDCard for a Pi0 - My Duh Moment

Interesting, as the Chinese are said to say.

Since there will probably be more arm64 images, would it be worth putting them in a separate folder?
by Burngate
Thu Jul 08, 2021 8:26 am
Forum: General discussion
Topic: Follow Up on "Not Just For Kids"
Replies: 10
Views: 512

Re: Follow Up on "Not Just For Kids"

If the Raspberry Pi did not run Linux, then you would have to choose from either Windows or Android. Or RISC OS. https://en.wikipedia.org/wiki/RISC_OS https://www.riscosopen.org/content/ There's a subforum here ( https://www.raspberrypi.org/forums/viewforum.php?f=55 ) that some of us visit, you mig...
by Burngate
Wed Jul 07, 2021 5:43 pm
Forum: General discussion
Topic: Can the Wifi and Bluetooth be physically removed from a R-Pi 4 board?
Replies: 37
Views: 1422

Re: Can the Wifi and Bluetooth be physically removed from a R-Pi 4 board?

Would dropping a blob of solder across the input to the antenna count as "no wireless capability"? A lot easier than trying to remove the chip. Yes. From my research I have seen videos of people doing "surgery" on their Pi's to be able to do things like fit an external antenna. ...
by Burngate
Mon Jul 05, 2021 5:47 pm
Forum: General discussion
Topic: Can the Wifi and Bluetooth be physically removed from a R-Pi 4 board?
Replies: 37
Views: 1422

Re: Can the Wifi and Bluetooth be physically removed from a R-Pi 4 board?

Lots of commercial clients specify "no wireless capability" in systems delivered to them, by which they mean no hardware or software capability, so definitely not an unusual request. Would dropping a blob of solder across the input to the antenna count as "no wireless capability"...
by Burngate
Thu Jun 24, 2021 8:21 am
Forum: General discussion
Topic: Half price Raspberry Pi Pico
Replies: 17
Views: 873

Re: Half price Raspberry Pi Pico

alphanumeric wrote:
Wed Jun 23, 2021 8:27 pm
... And I almost always add a Pi Zero to any order I place just to have a few kicking around as spares.
I wonder how many extra Zeros get bought that way ... and if the one-per-order limit has actually increased the sale of Pis.
by Burngate
Fri Jun 18, 2021 9:18 am
Forum: Python
Topic: keyboard input to Pi - reversing normally off to on?
Replies: 2
Views: 225

Re: keyboard input to Pi - reversing normally off to on?

I've setting up a conventional manual typewriter with sensors to feed key strokes to a Pi. I do hope you post some pictures when you're done! My keys, unlike a normal keyboard, will all be in the "on" state (due to the mechanics of it all). In other words, pressing a key will send an off ...
by Burngate
Wed May 26, 2021 9:41 am
Forum: Compute Module
Topic: Any plans for more 'stock' ?
Replies: 21
Views: 1542

Re: Any plans for more 'stock' ?

I wonder how Trump caused the drought that's currently giving TSMC such problems, and why, given TSMC is Taiwanese, not Chinese
by Burngate
Thu May 20, 2021 6:07 pm
Forum: Troubleshooting
Topic: Buttons not getting a good read
Replies: 12
Views: 425

Re: Buttons not getting a good read

I find that insulting.

Since we're here to help, deliberately putting wrong information here seems a bad idea.
by Burngate
Thu May 20, 2021 9:49 am
Forum: Troubleshooting
Topic: Buttons not getting a good read
Replies: 12
Views: 425

Re: Buttons not getting a good read

According to what I've read, WiringPi 17 is BCM 28, which hasn't been available since very early boards (it was available as PCM_CLK on a separate header)

https://pinout.xyz/# is a very useful source of info to work out what can be done with GPIOs and what to call them
by Burngate
Thu May 20, 2021 9:41 am
Forum: Troubleshooting
Topic: Buttons not getting a good read
Replies: 12
Views: 425

Re: Buttons not getting a good read

mosfets are the switch family of semiconductors. Unlike transistors, that you have to bias, once it has reached its threshold voltage, it turns on to full conduction. Not true. Once the threshold voltage is reached, it begins to turn on, but won't conduct significantly until a higher gate-source vo...
by Burngate
Tue May 18, 2021 5:52 pm
Forum: General discussion
Topic: Is it possible to have multiple accelerometer in pi zero ?
Replies: 4
Views: 302

Re: Is it possible to have multiple accelerometer in pi zero ?

One on each hoof going over Bechers, or one on each limb and one on the head coming off there.

One on each hoof and one on each wing of Pegasus.

I could go on, but I won't.
by Burngate
Tue May 11, 2021 5:25 pm
Forum: Off topic discussion
Topic: Help identifying tiny chip
Replies: 28
Views: 3136

Re: Help identifying tiny chip

razzjazz192 wrote:
Tue May 11, 2021 1:37 am
I recently ordered a bunch of electronic components, and out of one of those packages, ...
Who from? What components? What else was in that package?

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