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by Burngate
Sat Mar 30, 2019 7:13 pm
Forum: Beginners
Topic: Getting started. Something wrong
Replies: 14
Views: 410

Re: Getting started. Something wrong

mistofeles wrote:
Sat Mar 30, 2019 8:22 am
The device is an older version with 'shirt' GPIO connector, LAN and RCA connector.
Perhaps for 'shirt' read 'short'? Perhaps Pi 1
by Burngate
Sat Mar 30, 2019 10:11 am
Forum: Troubleshooting
Topic: no boot - always red light - rpi3b+
Replies: 9
Views: 231

Re: no boot - always red light - rpi3b+

edimi wrote:
Fri Mar 29, 2019 7:40 pm
The point is how to prove it :?
Depends where you are, but my understanding of it is, in the EU at any rate, within 6 months of the sale, you don't have to prove anything, the supplier has to prove your wrong-doing
by Burngate
Fri Mar 29, 2019 6:40 pm
Forum: Troubleshooting
Topic: 5V on test points but still undervoltage lightning bolt
Replies: 15
Views: 508

Re: 5V on test points but still undervoltage lightning bolt

euroeuro wrote:
Fri Mar 29, 2019 1:49 pm
... a Power Supply at 12V going through a Voltage Regulator (up to 3A Output Load Current) ...
euroeuro wrote:
Fri Mar 29, 2019 4:20 pm
... a constant high squeking noise ...
Can you tell us what PSU and regulator you're using?
by Burngate
Fri Mar 29, 2019 11:09 am
Forum: Troubleshooting
Topic: LED, USB, KEYBOARD problem. Or RPi broke?
Replies: 8
Views: 198

Re: LED, USB, KEYBOARD problem. Or RPi broke?

Since it's known* that the pmic can cause this problem, you may find that it isn't that capacitor that's at fault. * Just as it was known by Aristotle that the world was flat. Since then, we've discovered it's round. Which explains the large earthquakes that have occurred between then and now - chan...
by Burngate
Fri Mar 29, 2019 10:17 am
Forum: Beginners
Topic: Is "backfeed" a problem if USB hub and Pi both use same 5 V source?
Replies: 5
Views: 188

Re: Is "backfeed" a problem if USB hub and Pi both use same 5 V source?

A lot depends on how far apart things are, and how you route the cables. Ground loops can cause havoc, with stray magnetic fields creating voltages that can upset data, and the area of the loop is important. The same would be true of the 5v loop if you allowed that to exist. You could minimse the ar...
by Burngate
Thu Mar 28, 2019 6:55 pm
Forum: Mathematica
Topic: A writing on the development of mathematical systems
Replies: 2
Views: 437

Re: A writing on the development of mathematical systems

Quite what do you mean by "Mathematical systems"? It seems such a broad subject - could you narrow it down somewhat?
by Burngate
Thu Mar 28, 2019 6:52 pm
Forum: General discussion
Topic: Pi 4 questions
Replies: 166
Views: 7197

Re: Pi 4 questions

I'm 70. I come here, I feel old. I visit the in-laws (91 & 92), I feel young. She complains about just about everything, so I tell her she's still got the Queen's telegram to look forward to. I doubt Charles will still be doing telegrams by the time I'm due for one, but I tell myself at least I've ...
by Burngate
Wed Mar 27, 2019 7:04 pm
Forum: General discussion
Topic: Pi 4 questions
Replies: 166
Views: 7197

Re: Pi 4 questions

jamesh wrote:
Wed Mar 27, 2019 5:27 pm
Just as long as everyone realises that the Pi4 spec is set in stone
Ah, but what sort of stone? Basalt? Granite? Chalk? Marble?
My preference would be either Gneiss or Schist, only because they're difficult to spell.
by Burngate
Wed Mar 27, 2019 6:57 pm
Forum: Beginners
Topic: Breadboard not powering
Replies: 17
Views: 375

Re: Breadboard not powering

I have also wired directly to the pins of the gpio and this also does not work I have checked with a multimeter and it is getting a voltage. Where did you measure with your multimeter? And what reading did you get? I had a look for the "freenove tutorial" and found one labelled "Freenove Super Star...
by Burngate
Tue Mar 26, 2019 6:58 pm
Forum: General discussion
Topic: Pi 4 questions
Replies: 166
Views: 7197

Re: Pi 4 questions

Cool is not an attitude - It's a state of mind. Imagine an eagle flying through the Rocky Mountains, suddenly, it spies its prey, and falls, falls, falls, it's wings guiding it, but to what? Think of the primitive thoughts cascading through the eagles mind as it plummets towards the rocks below. Th...
by Burngate
Tue Mar 26, 2019 10:05 am
Forum: Beginners
Topic: Power Bank : 6000mah
Replies: 5
Views: 163

Re: Power Bank : 6000mah

anvoice wrote:
Tue Mar 26, 2019 6:37 am
W. H. Heydt wrote: It means 6Ah at 3.7v, or about 22Ah.
Just a minor point, "22Ah" is pretty much meaningless.
His finger slipped down-left.
He meant "about 22Wh"
by Burngate
Mon Mar 25, 2019 6:49 pm
Forum: HATs and other add-ons
Topic: Interfacing with another system running 5 volts
Replies: 6
Views: 300

Re: Interfacing with another system running 5 volts

A resistor only drops voltage when current passes through it - Ohm's law. Since GPIOs are very high impedance, they won't pass any current, so you need something else to take that current, and a second resistor to ground is ideal. Just make sure their values - or rather the ratios of their values - ...
by Burngate
Mon Mar 25, 2019 6:33 pm
Forum: General discussion
Topic: Is this micro sd card good?
Replies: 34
Views: 1035

Re: Is this micro sd card good?

Heater wrote:
Sun Mar 24, 2019 4:50 am
... a grocery store .... As in a shop that sells vegetables.
A grocer just sells household goods, archaically in large quantities (gross)
A shop that sells just veg should be called a greengrocer - even though spuds shouldn't be green
by Burngate
Mon Mar 25, 2019 6:25 pm
Forum: Beginners
Topic: Breadboard not powering
Replies: 17
Views: 375

Re: Breadboard not powering

The breadboard in the photos doesn't seem to be "gotcha'd" in that way - the red and blue lines are continuous. What might help the OP would be to take the back off the breadboard (if it's got screws holding it together). He could then see what connects to what, and possibly draw lines on the top wi...
by Burngate
Fri Mar 22, 2019 11:49 am
Forum: Beginners
Topic: Sinusoidallly Modulated Signal Output
Replies: 4
Views: 153

Re: Sinusoidallly Modulated Signal Output

Headphone jacks and plugs ("jack" refers to the female connector) are just a way to keep things tidy. A pair of wire cutters and a soldering iron will allow you to create an adapter between your two pins and a 3.5mm TRRS plug that you can then plug directly into the Pi 3B+ - no need for any extra so...
by Burngate
Thu Mar 21, 2019 10:36 am
Forum: General discussion
Topic: Pi 3B male 40 pin header - gold, nickel or tin plating?
Replies: 15
Views: 821

Re: Pi 3B male 40 pin header - gold, nickel or tin plating?

Many years ago, my employer sent me on a soldering course at Cranfield, where it was suggested that gold flashing was a really bad idea, and we should wash off the gold using copious amounts of solder. It seems to me you have several choices. Do nothing and live with the consequences. Do as you sugg...
by Burngate
Wed Mar 20, 2019 7:07 pm
Forum: Beginners
Topic: Hall effect sensor with electricity cables
Replies: 5
Views: 218

Re: Hall effect sensor with electricity cables

... I can detect if the is a magnet nearby. When I tried it with a cable with power running through, it doesn't detect it. Be aware that the field around a wire carrying a current is tiny compared to the field round a permanent magnet, unless the current is massive It ain't the power, which is Volt...
by Burngate
Tue Mar 19, 2019 10:25 am
Forum: Troubleshooting
Topic: Replace Broken Component (capacitor, transistor, resistor?)
Replies: 10
Views: 534

Re: Replace Broken capacitor - [Solved]

upandcominggamer wrote:
Tue Mar 19, 2019 4:15 am
I'm not sure how these forums work, but feel free to close the topic moderators! ;)
Best option appears to be for you to edit your first post, and change the subject to something like
"Replace Broken capacitor - [Solved]"
by Burngate
Mon Mar 18, 2019 7:22 pm
Forum: Beginners
Topic: Breadboards and Phat
Replies: 10
Views: 299

Re: Breadboards and Phat

The term you're looking for to put into Google is "Cobbler", for no apparent reason that I can see. Also Google doesn't like it, either, until I put in "AdaFruit" who among others make them - you attach it to the Pi with a ribbon cable and plug it into the breadboard.
by Burngate
Mon Mar 18, 2019 7:11 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Original SD Card wiring 3 B+
Replies: 3
Views: 216

Re: Original SD Card wiring 3 B+

It's a great shame we cannot now see as much as we could of the original Pi. That had everything visible! Still, there are the CM and CMIO documents, including the SD card slot, so you might be able to trace things round - SD cards all have the same wiring, including the micro ones and the holders t...
by Burngate
Sun Mar 17, 2019 12:10 pm
Forum: Beginners
Topic: Input Relays
Replies: 21
Views: 1073

Re: Input Relays

Is there a reason behind that?
I can't see what difference it would make, given the relative sizes of the voltages involved.
by Burngate
Sun Mar 17, 2019 12:01 pm
Forum: Networking and servers
Topic: Hidden information about manufacturer.
Replies: 9
Views: 847

Re: Hidden information about manufacturer.

As an aside, it slightly bemuses me that the manufacturer is given as "Raspberry Pi Foundation"
Surely the Foundation does nothing of the sort - it leaves it to Raspberry Pi Trading, who licence (?) Farnel and RS, who get Sony to build it.
by Burngate
Sun Mar 17, 2019 11:56 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: HDMI interference re-setting my Pi?
Replies: 2
Views: 389

Re: HDMI interference re-setting my Pi?

A couple of things spring to mind. If the only connection to earth is via the monitor, and removing that connection removes the problem, then I would suspect the monitor. "... and inadvertently nudged a power supply to the security cameras. That re-set the Pi3B." I'm not sure what a nudge is, but ev...
by Burngate
Sat Mar 16, 2019 12:22 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: RPI 3 A+ USB Peripheral Mode Power
Replies: 2
Views: 297

Re: RPI 3 A+ USB Peripheral Mode Power

It's generally not a good idea to have two power supplies fighting each other.
by Burngate
Sat Mar 16, 2019 12:18 pm
Forum: Off topic discussion
Topic: Worried, Whatever-Speed
Replies: 59
Views: 3282

Re: Worried, Whatever-Speed

Just out of interest, I got a couple of 16x32 LED panels.
The LEDs are either on or off, so to create a grey-scale image, I had to create a "PWM"-style output, and re-write it continuously.

Basic / Python made it flicker, but assembler was quick enough to be nice and smooth.

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