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by Burngate
Tue Feb 25, 2020 10:01 am
Forum: General discussion
Topic: Where can I download Raspbian 32 bit
Replies: 7
Views: 289

Re: Where can I download Raspbian 32 bit

Possibly the confusion is because nowhere on the downloads page does it mention "32 bit"
alixm wrote:
Mon Feb 24, 2020 5:21 pm
... I can't find a 32 bit imnage, where can I find this dowload please?
32 bit is the default.
If it doesn't say it's 64-bit (or any other number) then it's 32-bit
by Burngate
Mon Feb 24, 2020 6:25 pm
Forum: HATs and other add-ons
Topic: Enable hot-plugging into breadboard by hardware
Replies: 12
Views: 267

Re: Enable hot-plugging into breadboard by hardware

... My best solution so far would be something like connecting a USB-port to the GPIO and a USB-cable to the breadboard (because USB is said to be hot-plug safe). I don't think it's possible to connect a USB port to the GPIO. And if you could, the "hot-plug"-iness (if that's a word) is only safe if...
by Burngate
Sun Feb 23, 2020 11:36 am
Forum: Beginners
Topic: Appropriate device for switching low current AC
Replies: 5
Views: 133

Re: Appropriate device for switching low current AC

https://www.digchip.com/datasheets/parts/datasheet/107/LCA715S-pdf.php Technically, it's a solid-state relay, not just an optocoupler. Hair-splitting is my forte. https://www.raspberrypi.org/forums/viewtopic.php?f=37&t=261683#p1594299 It may be old-fashioned and clunky, but it's reliable. Probably ...
by Burngate
Sun Feb 23, 2020 10:56 am
Forum: Troubleshooting
Topic: RPI 4 boots only when power connection is done via USB-C port and not power socket !?
Replies: 2
Views: 166

Re: RPI 4 boots only when power connection is done via USB-C port and not power socket !?

This does sound wierd - especially as many of us have recommended switched mains sockets to avoid having to plug/unplug the USB-c connector.

Is the OKDO PSU slow to bring up its output? I can't think of anything else it could be!
by Burngate
Sun Feb 23, 2020 10:41 am
Forum: Beginners
Topic: Appropriate device for switching low current AC
Replies: 5
Views: 133

Re: Appropriate device for switching low current AC

SCR? no - it's unidirectional. Triac? The problem as I see it is that one leg has to be common to both the Pi and the valve power supplies. I'd prefer to keep them separate if possible, Optocoupler? none that I know about could handle AC at the current you want. A solid-state relay could have one bu...
by Burngate
Fri Feb 21, 2020 7:27 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Monitor led flash via GPIO possible?
Replies: 2
Views: 90

Re: Monitor led flash via GPIO possible?

I wouldn't recommend connecting directly to a LED - you don't know what voltages are around it.

Instead, you could try an optoisolator, or put a light detector in front of the LED.
In either case you can then treat it as a simple switch.
by Burngate
Fri Feb 21, 2020 7:09 pm
Forum: General discussion
Topic: Raspberry pi 4 (b)
Replies: 6
Views: 303

Re: Raspberry pi 4 (b)

A history lesson.
When conceived, the Pi was thought of as a great-grand-child of the BBC microcomputer, of which there were A and B versions - the B being better if not bigger than the A.

So the Pi came as a B, or chopped down as an A.

Now we just have the B
by Burngate
Fri Feb 21, 2020 6:56 pm
Forum: General discussion
Topic: New Pi 4B v1.2?
Replies: 331
Views: 43379

Re: New Pi 4B v1.2?

So the schematic at https://www.raspberrypi.org/documentation/hardware/raspberrypi/schematics/rpi_SCH_4b_4p0_reduced.pdf is now possibly out of date? Would a quick fix be to add a small chunk to the right and down a bit of the "old" USB-C POWER IN chunk, where there's a nice big blank space? (possib...
by Burngate
Fri Feb 21, 2020 10:23 am
Forum: General discussion
Topic: How close can a neo magnet safely be to a Raspberry Pi?
Replies: 9
Views: 408

Re: How close can a neo magnet safely be to a Raspberry Pi?

Heater wrote:
Fri Feb 21, 2020 2:27 am
Circuits often have components that are constructed of ferromagnetic materials, transformers, inductors, chokes, ...
... of which there are at least four round the PMIC, a couple on the rail labeled 1V05_VLI, eight in the ethernet socket ... and that's only the ones on the schematic
by Burngate
Thu Feb 20, 2020 7:12 pm
Forum: Off topic discussion
Topic: My kid is using a Raspberry Pi - should I call the police???
Replies: 32
Views: 1594

Re: My kid is using a Raspberry Pi - should I call the police???

If you found lockpicks and bolt cutters in your kids bedroom would you be concerned? Tools can be used for both constructive and destructive purposes but some tools edge more towards one side of that line than the other. Lock picking is an engineering skill. Not quite a teenager at the time, but I ...
by Burngate
Thu Feb 20, 2020 6:55 pm
Forum: Troubleshooting
Topic: Pi 3 freezes when using GPIO?
Replies: 1
Views: 49

Re: Pi 3 freezes when using GPIO?

The part you've circled is the WiFi antenna, I believe. GPIO header pin 4 is 5v, not actually a GPIO at all - unless you mean pin 7 which is GPIO 4 Whatever, Raspbian should work quite happily whilst using GPIOs. Whatever your program was doing, if it was driving or sensing a GPIO it was possibly do...
by Burngate
Tue Feb 18, 2020 10:41 am
Forum: Networking and servers
Topic: ethernet over powerline driver
Replies: 17
Views: 570

Re: ethernet over powerline driver

My interpretation of "I like to see if I can add functionality of "Ethernet over Powerline" to this PI" and "I was thinking whether I can add this functionality to the PI itself so that I can carry one fewer gadgets during travel. " is that tpaullee was thinking not of using commercially available ...
by Burngate
Sun Feb 16, 2020 10:57 am
Forum: Beginners
Topic: Where could I find the online tutorials to match this kit?
Replies: 6
Views: 241

Re: Where could I find the online tutorials to match this kit?

That kit looks somewhat similar to a kit someone else asked about: viewtopic.php?f=63&t=265063

So have a look at that kit, and see if it helps.
by Burngate
Fri Feb 14, 2020 12:12 pm
Forum: General discussion
Topic: Power Board Module + Extension Board
Replies: 2
Views: 112

Re: Power Board Module + Extension Board

A bit of research led me to https://git.io/fjVYW which gives a PDF tutorial. Pages 47 & 48 give the details you need. So, if you can physically connect both power board and GPIO extension board to your breadboard, then yes. But they don't show a picture of that happening. Not very clever of them, in...
by Burngate
Thu Feb 13, 2020 6:17 pm
Forum: Off topic discussion
Topic: Quartz Crystal Occisaltor
Replies: 15
Views: 695

Re: Quartz Crystal Occisaltor

How old is classic?

In my student days, most people seemed to want one of those red road-works oil lamps, but I wanted Modern.
So I took apart one of those flashing amber ones and found this:
RWL.png
RWL.png (2.17 KiB) Viewed 501 times
by Burngate
Thu Feb 13, 2020 10:40 am
Forum: Off topic discussion
Topic: Quartz Crystal Occisaltor
Replies: 15
Views: 695

Re: Quartz Crystal Occisaltor

You may need to learn about how this sort of crystal works. Choose the right material, cut it in the right way, and apply a voltage across it, it bends. That takes energy, requiring coulombs, so while it's bending, current is being drawn. There might be enough to light a LED Once it's bent as far as...
by Burngate
Tue Feb 11, 2020 11:09 am
Forum: Beginners
Topic: Did I damage my Raspberry Pi 4?
Replies: 2
Views: 143

Re: Did I damage my Raspberry Pi 4?

There should be no need to downgrade to a Pi 3 or 2; the differences between those and the 4 should not affect this. The Sunfounder page was written before the Pi 4 came out, but also is rather badly written; the C code uses the depricated WiringPi - that's where the designation GPIO0 comes from, fo...
by Burngate
Tue Feb 11, 2020 10:33 am
Forum: Troubleshooting
Topic: RPi 3A+ : Only red light
Replies: 2
Views: 62

Re: RPi 3A+ : Only red light

poulpette wrote:
Mon Feb 10, 2020 7:46 pm
..., only the red light was blinking ...
There's your first problem. Power supply.

Other than that, have you read https://www.raspberrypi.org/forums/view ... 28&t=58151 ?
by Burngate
Thu Feb 06, 2020 7:11 pm
Forum: Beginners
Topic: Database MySQL memory
Replies: 6
Views: 163

Re: Database MySQL memory

... 1. I think you need to learn a bit more about relational databases, of which MySQL is one example. ... Where should he* look for that? I've tried quite a few books, internet sites, etc. but while most of them are good at describing "how to", none of them seem to want to describe "what's under t...
by Burngate
Thu Feb 06, 2020 10:31 am
Forum: Troubleshooting
Topic: RasPi only boots correct when HDMI is plugged in
Replies: 9
Views: 545

Re: RasPi only boots correct when HDMI is plugged in

does that mean that removing the "#" always makes the command live in the coinfig folder? Yes - the "#" is just their way of marking something as a remark rather than code. Other places, other methods - you're probably too young to remember BBC BASIC's "REM" It's just assumed you already know this,...
by Burngate
Wed Feb 05, 2020 7:31 pm
Forum: Off topic discussion
Topic: Best example of a bad forum post?
Replies: 87
Views: 3622

Re: Best example of a bad forum post?

... : http://www.catb.org/esr/faqs/smart-questions.html ... elitist. i'm not sure "elitist" or "arrogant" are the right descriptions, but I do think "long-winded" is applicable. Consider, for example, a twelve-year-old on his birthday. Do you really think he's going to read through that lot before ...
by Burngate
Wed Feb 05, 2020 12:14 pm
Forum: General discussion
Topic: will the price of a RPI zero change after Brexit
Replies: 15
Views: 931

Re: will the price of a RPI zero change after Brexit

... seeing as it is reasonable to assume that any trade deal between the EU and UK will be dictated by the EU and will most likely not be as pleasant as being in the trade union. That would made no sense for the EU to grant that. That makes a lot of assumptions. Britain isn't a small country that's...
by Burngate
Tue Feb 04, 2020 11:04 am
Forum: Troubleshooting
Topic: RPi 4B not booting after SPI connection
Replies: 3
Views: 93

Re: RPi 4B not booting after SPI connection

... and smoke came out from it somewhere between the power port and display ports Never happened again until last week when smoke came out again. Smoke is Bad. Your description of where it came from appears to be the power management chip, which converts the incoming 5v to all the supplies the Pi n...
by Burngate
Mon Feb 03, 2020 11:59 am
Forum: Off topic discussion
Topic: Raspberry Pi for saving marriage.
Replies: 47
Views: 3028

Re: Raspberry Pi for saving marriage.

Plus the roadworks on the M2 and M20 due to brexit. We're having to go Sunningdale to Sutton and back, every Sunday. Up till now, the M25 has been gloriously clogged, both ways - 18 miles in 30 minutes, on average. But this week, due to Brexit, almost no traffic! One thing I don't understand - the ...
by Burngate
Sun Feb 02, 2020 11:20 am
Forum: Troubleshooting
Topic: RasPi only boots correct when HDMI is plugged in
Replies: 9
Views: 545

Re: RasPi only boots correct when HDMI is plugged in

hansandreasr wrote:
Wed Jan 29, 2020 2:40 pm
it is already in the config folder as

hdmi_force_hotplug = 1
Is it

Code: Select all

#hdmi_force_hotplug=1
or

Code: Select all

hdmi_force_hotplug=1
Removing the # makes it live

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