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by Burngate
Mon Oct 14, 2019 10:08 am
Forum: General discussion
Topic: "Realtime" audio output using RPi?
Replies: 4
Views: 301

Re: "Realtime" audio output using RPi?

... I'm thinking about going down an ARM Microcontroller route so I can respond in realtime without any interruptions from an OS. You do know that a Pi isn't a Microcontroller - it's a fully-fledged computer, running an operating system (usually Raspbian, but there are others - RISCOS is closer to ...
by Burngate
Mon Oct 14, 2019 10:03 am
Forum: Troubleshooting
Topic: Raspberry Pi 4 Red Light
Replies: 10
Views: 241

Re: Raspberry Pi 4 Red Light

Probably the 5V has shorted to 3.3V. Just avoid this, because it's deadly for the Pi. If that was what happened, it would die immediately. From the first post: ... one day, the power went out and after I switched the Raspberry back on it started to randomly switch itself off without apparent reason...
by Burngate
Sun Oct 13, 2019 9:34 am
Forum: Troubleshooting
Topic: Raspberry Pi 4 Red Light
Replies: 10
Views: 241

Re: Raspberry Pi 4 Red Light

If the red LED is on, it's unlikely to be the PSU.

Have you tested pin 1 for 3v3?
by Burngate
Sun Oct 13, 2019 9:31 am
Forum: Troubleshooting
Topic: Raspberrypi 4 booting but no usb
Replies: 10
Views: 275

Re: Raspberrypi 4 booting but no usb

Since the B+ came out there's been a AP2553 or similar USB power control switch feeding the USB sockets.
Perhaps that's what's preventing power reaching the sockets?

Are any of the sockets damaged in any way?
FernandaRamos wrote:
Sat Oct 12, 2019 6:50 pm
It is the second time it happened within 2 days.
Did it come good in between?
by Burngate
Sat Oct 12, 2019 10:45 am
Forum: Troubleshooting
Topic: Raspberry Camera quality degradation
Replies: 3
Views: 113

Re: Raspberry Camera quality degradation

In the absence of any reply, here or at https://www.raspberrypi.org/forums/viewtopic.php?p=1550683#p1550683 , I'd be wanting to distinguish between "hazy" as in out of focus, "hazy" or "washed out" as in black not being fully black, and "washed out colour" as in deep red being only pinkish, deep blu...
by Burngate
Fri Oct 11, 2019 5:40 pm
Forum: General discussion
Topic: Can't light led
Replies: 19
Views: 482

Re: Can't light led

I wonder if Judoguy12 or XY_position_indicate could make use of WiringPi gpio readall, or a follow-up mentioned in https://www.raspberrypi.org/forums/view ... 6&t=254071
It might give them a clue as to what's going on.
by Burngate
Wed Oct 09, 2019 6:26 pm
Forum: General discussion
Topic: Switch or not
Replies: 21
Views: 567

Re: Switch or not

Like contact ratings ?? Switches - mechanical ones - are usually rated for their maximum current-breaking capacity, without any mention of resistance. So one designed for small currents will probably be designed for low resistance in signal circuits, and probably be silver-plated to reduce any oxid...
by Burngate
Wed Oct 09, 2019 9:49 am
Forum: General discussion
Topic: Am I the only one that still would buy a Raspberry Pi 3b+?
Replies: 59
Views: 1762

Re: Am I the only one that still would buy a Raspberry Pi 3b+?

The generator generates about 280vAC which is regulated down to 240vAC One tank of fuel (24L) will last around 11 hours, at maximum load. It also lasts around 11 hours, at idle load. In other words, excess electricity generated is converted into heat and lost. Something is very wrong with your gene...
by Burngate
Tue Oct 08, 2019 5:45 pm
Forum: General discussion
Topic: Am I the only one that still would buy a Raspberry Pi 3b+?
Replies: 59
Views: 1762

Re: Am I the only one that still would buy a Raspberry Pi 3b+?

We have a 5HP generator and it generates more electricity than we use, so most of it is wasted. Rubbish. The capacity may be wasted, but if you don't use the power, it is not generated. It is also possible (IDK) that a 5HP generator at half load is more efficient than a 2.5HP generator flat out. A ...
by Burngate
Mon Oct 07, 2019 5:27 pm
Forum: Off topic discussion
Topic: Voltage conventions
Replies: 6
Views: 442

Re: Voltage conventions

Me too. It might be better to call one "Reference" or "REF", just so we know what the "potential difference" is different from. But I'm not going to approach rant-mode - I'm just going to spend my remaining days mumbling into my beard about how the world's gone downhill since the sixties. And now, w...
by Burngate
Mon Oct 07, 2019 5:19 pm
Forum: Troubleshooting
Topic: Not Booting
Replies: 10
Views: 304

Re: Not Booting

... 26.37 volts ... 52.33 volts ... 52.70 ... I dont know if these voltages are correct or incorrect? :P please help me out here These are not correct! If the red led is on, then it's receiving the correct voltage, despite using an iffy supply. Make sure you are using your multimeter correctly - ch...
by Burngate
Mon Oct 07, 2019 9:34 am
Forum: Troubleshooting
Topic: Power Issues w/ 6 AA Batteries through Buck Converter Powering the Pi3B+
Replies: 8
Views: 227

Re: Power Issues w/ 6 AA Batteries through Buck Converter Powering the Pi3B+

If the red PWR led goes off, then the 5v is dropping below about 4.75v, even if only briefly. Your meter may not register this drop. The cause could be that the buck converter is unable to supply enough current and maintain its 5.1v. Or it could be that the wires between it and the Pi are too thin. ...
by Burngate
Sun Oct 06, 2019 9:26 am
Forum: Troubleshooting
Topic: Raspberry Camera quality degradation
Replies: 3
Views: 113

Re: Raspberry Camera quality degradation

Have you cleaned the lens of the camera?
by Burngate
Sat Oct 05, 2019 9:56 am
Forum: Off topic discussion
Topic: I wanna unsolder display conector RASPBERRY PI 4
Replies: 11
Views: 638

Re: I wanna unsolder display conector RASPBERRY PI 4

Can I ask why you want to do this?
by Burngate
Sat Oct 05, 2019 9:47 am
Forum: Off topic discussion
Topic: I wanna unsolder display conector RASPBERRY PI 4
Replies: 11
Views: 638

Re: I wanna unsolder display conector RASPBERRY PI 4

It's just a connector - the Pi doesn't depend on the bits of plastic or metal to work.
So it depends on how good your soldering skills are.
by Burngate
Fri Oct 04, 2019 10:55 am
Forum: Graphics, sound and multimedia
Topic: Interference Problems
Replies: 3
Views: 190

Re: Interference Problems

I'd be looking for a ground loop - I assume the negative side of the 19v supply is connected to the ground of the amp and (via the 5v voltage converter) to the ground of the Pi, and the ground of the audio jack is also connected to the ground of the amp.
by Burngate
Fri Oct 04, 2019 10:03 am
Forum: Off topic discussion
Topic: I need to rotate a heavy mass in a controlled manner - Do I need ramps?
Replies: 5
Views: 520

Re: I need to rotate a heavy mass in a controlled manner - Do I need ramps?

I have a mass of 1,5 kg with its center of mass 15 cm away from the rotations center. That gives me 2,55 Nm. That doesn't make a lot of sense, to me, so maybe there's something you're not telling us. Just as, in a linear system, force / mass gives acceleration, so in a rotating system, torque, mome...
by Burngate
Mon Sep 30, 2019 6:16 pm
Forum: Media centres
Topic: Resister value for summing circuit?
Replies: 1
Views: 163

Re: Resister value for summing circuit?

A lot depends on the input impedance of your amplifier, but ... The Pi's audio circuitry is such that it shouldn't be too stressed even if it's fed into a short-circuit, so you may find just joining the two channels together works satisfactorily, albeit the upper frequency limit may be compromised. ...
by Burngate
Sat Sep 28, 2019 6:12 pm
Forum: Beginners
Topic: 230/240 motor/fan Engine
Replies: 1
Views: 74

Re: 230/240 motor/fan Engine

How are you powering your Pi? It's very possible that the current surge as the motor starts is disturbing the Pi's supply. What relay PCB? There isn't a standard one. And it's possible that, if you're using the Pi's 5v to power the relay's coil, the current in that is disturbing the Pi. What is a "s...
by Burngate
Sat Sep 28, 2019 9:04 am
Forum: Troubleshooting
Topic: My Pi 4 Forces 4K When Desired Output is 1080p
Replies: 7
Views: 242

Re: My Pi 4 Forces 4K When Desired Output is 1080p

Could it be a problem with the settings in your TV?
Some TV manufacturers have strange ideas about what their customers want to see on their screens!
by Burngate
Sat Sep 28, 2019 8:54 am
Forum: Bare metal, Assembly language
Topic: Setting the output register for a GPIO on Pi 4
Replies: 21
Views: 900

Re: Setting the output register for a GPIO on Pi 4

Having read LdB's reply to your question, and realised I'd misread your question (I too can't tell the difference between 10 and 36) I came downstairs this morning ready to delete my reply as totally irrelevant. However, since you've quoted me, I'll leave it there, as a lesson for others: read the q...
by Burngate
Fri Sep 27, 2019 5:20 pm
Forum: Bare metal, Assembly language
Topic: Setting the output register for a GPIO on Pi 4
Replies: 21
Views: 900

Re: Setting the output register for a GPIO on Pi 4

Once upon a time ... when the first Pi was being designed, on the chip they wanted to use they had a range of GPIOs (General Purpose Input/Outputs) that they wanted to bring out to a header. Inside the chip, the registers that accessed them had them in a certain order. This gave rise to the GPIO num...
by Burngate
Fri Sep 27, 2019 10:01 am
Forum: Bare metal, Assembly language
Topic: Setting the output register for a GPIO on Pi 4
Replies: 21
Views: 900

Re: Setting the output register for a GPIO on Pi 4

nickell8448 wrote:
Fri Sep 27, 2019 9:54 am
To understand this well, you state that GPIO16 is pin 10 on the 40 pin header, how did you make that connection? I could not make that connection based on all the reading I have done. Do you any specific resource you would recommend to learn this?
https://pinout.xyz/#
by Burngate
Fri Sep 27, 2019 9:32 am
Forum: Beginners
Topic: NOOBS won't install.
Replies: 3
Views: 103

Re: NOOBS won't install.

... also my Mac at home has no sd card slot Buy a USB SD card reader? It could save hours of frustration treking to and from school! It would allow you to check that the card has been written correctly. It's not unknown for internal SD card readers to not work correctly, and that might apply to you...
by Burngate
Fri Sep 27, 2019 9:26 am
Forum: Troubleshooting
Topic: Raspberry pins not working
Replies: 7
Views: 271

Re: Raspberry pins not working

As Imperf3ct says, the 5v pins are connected directly to the power input, so must be at 5v for the Pi to be working. So, two questions: What are you using as a ground reference for the (black) lead of your meter? A good place is the metal shroud of any of the USB or HDMI sockets. Is the battery in y...

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