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by jbudd
Mon Jul 26, 2021 8:49 pm
Forum: Beginners
Topic: Led Matrix With pi
Replies: 21
Views: 358

Re: Led Matrix With pi

thnx guys, I'll stay safe but can anyone explain me the logic behind this ? why with the 5v out from the pi the led will not work ? why if I connect the matrix to the pi like I said (5 pin out to the 5v of the matrix, the gpio to the matrix in and the ground pin to the matrix ground) the pi gonna b...
by jbudd
Mon Jul 26, 2021 12:55 pm
Forum: Beginners
Topic: First project questions - garden automation
Replies: 2
Views: 85

Re: First project questions - garden automation

Yes you can use a Pi 3 instead of a Zero WH. Soil moisture sensors are notoriously unreliable. Adafruit make good products so maybe theirs is better than the cheap chinese versions. I have used a Xiaomi sensor which connects with bluetooth, an added complexity but it gives the possibility of keeping...
by jbudd
Mon Jul 26, 2021 12:19 am
Forum: Beginners
Topic: Led Matrix With pi
Replies: 21
Views: 358

Re: Led Matrix With pi

At the worst you will have gained experience and lost £35. Or more if its a Pi4 8GB
by jbudd
Sun Jul 25, 2021 11:59 pm
Forum: Beginners
Topic: Led Matrix With pi
Replies: 21
Views: 358

Re: Led Matrix With pi

Yes you can supply 5V from a 5V pin. But can it supply enough current for the LEDs?
You can't turn the 5V pins on and off. Thus you can't use them as data outputs.

I think you should consider two Pies. One for a Unicorn Hat and one for your other experiments.
by jbudd
Sun Jul 25, 2021 11:27 pm
Forum: Beginners
Topic: Led Matrix With pi
Replies: 21
Views: 358

Re: Led Matrix With pi

The datasheet shows connections for the Raspberry Pi. They specify the logic level converter because the board expects 5V data signal and a Pi's GPIOs are only 3.3V Maybe you would get away with it with just one matrix, maybe it wouldn't work or even fry your Pi. Actually the diagram shows 5V, GND a...
by jbudd
Fri Jul 23, 2021 12:28 am
Forum: Troubleshooting
Topic: unfrying a raspberry pi 4 (applied 12v to 5v pin, oops)
Replies: 11
Views: 244

Re: unfrying a raspberry pi 4 (applied 12v to 5v pin, oops)

I wonder if you could still use it as a USB hub.
by jbudd
Thu Jul 22, 2021 4:58 pm
Forum: Beginners
Topic: Frustration w/ syslog
Replies: 4
Views: 157

Re: Frustration w/ syslog

I should think this would do it:
cat /dev/null | sudo tee /var/log/syslog
Though normally what I do is
sudo vi /var/log/syslog
dG<RETURN>
:wq<RETURN>
by jbudd
Wed Jul 21, 2021 12:21 pm
Forum: Other projects
Topic: PIR sensor MagicMirror
Replies: 4
Views: 182

Re: PIR sensor MagicMirror

You might get better results with a laser time of flight sensor such as VL503L0X (range "up to 2metres") or VL53L1X ("up to 4 metres")
You will have to read and interpret the results though, it's not a simple digital signal when it senses movement.
by jbudd
Mon Jul 19, 2021 4:56 pm
Forum: Beginners
Topic: Where is the manual for compiling ffmpeg on rpi4?
Replies: 3
Views: 148

Re: Where is the manual for compiling ffmpeg on rpi4?

I think I know where you went wrong.
by jbudd
Mon Jul 19, 2021 12:05 pm
Forum: Beginners
Topic: Where is the manual for compiling ffmpeg on rpi4?
Replies: 3
Views: 148

Re: Where is the manual for compiling ffmpeg on rpi4?

What operating system do you have? 32 bit or 64?
At what point did these errors occur?
Did you successfully install all the libraries (steps 2 - 7 in that tutorial)?
Did you run the command at step 8?
by jbudd
Sat Jul 17, 2021 10:48 am
Forum: Beginners
Topic: Dashboard for Weather and More
Replies: 1
Views: 159

Re: Dashboard for Weather and More

Look for "magic mirror" setups. I think there are some articles in the MagPi about it.
by jbudd
Sat Jul 17, 2021 9:33 am
Forum: Beginners
Topic: Umount USB when headless?
Replies: 9
Views: 339

Re: Umount USB when headless?

Another option is LoRa. Long range, low speed.
https://learn.adafruit.com/lora-and-lor ... i/overview
by jbudd
Sat Jul 17, 2021 6:52 am
Forum: Troubleshooting
Topic: Pi 4 doesn't recognise SSD
Replies: 9
Views: 319

Re: Pi 4 doesn't recognise SSD

Looks like even if you get that OS to work performance will be bad because your SSD enclosure doesn't support UAS.
by jbudd
Fri Jul 16, 2021 10:13 pm
Forum: General discussion
Topic: Power Supply for Raspberry 4 bad design for Australia
Replies: 89
Views: 2661

Re: Power Supply for Raspberry 4 bad design for Australia

Speaking as someone who has lost close relatives to covid I'd say that's in bad taste.
by jbudd
Fri Jul 16, 2021 9:42 pm
Forum: Beginners
Topic: Umount USB when headless?
Replies: 9
Views: 339

Re: Umount USB when headless?

When you visit the Pi, can't you connect to it by wifi and copy the data?

You could use your phone as a wireless hotspot, the Pi should connect when it's in range.
Or the Pi could be the hotspot and your phone or other device connect to it.
by jbudd
Fri Jul 16, 2021 9:32 pm
Forum: Troubleshooting
Topic: Pi 4 doesn't recognise SSD
Replies: 9
Views: 319

Re: Pi 4 doesn't recognise SSD

Since you have highlighted in your post a 1TB disk mounted at /mnt/data, what exactly do you mean by "doesn't recognise the disk"?

Are you hoping that the Pi will boot from the SSD?

What does ls -l /mnt/data show you?
What about sudo fdisk -l ?
by jbudd
Thu Jul 15, 2021 1:31 pm
Forum: General discussion
Topic: sclk constant
Replies: 2
Views: 166

Re: sclk constant

Indeed.

The SCLK system is the component of SPICE concerned with spacecraft clock correlation data.

A SPI bus has usually the following signals:
SCLK, The clock signal, driven by the master
by jbudd
Wed Jul 14, 2021 10:15 pm
Forum: General discussion
Topic: Power Supply for Raspberry 4 bad design for Australia
Replies: 89
Views: 2661

Re: Power Supply for Raspberry 4 bad design

I suspect this is just because those funny English plugs have the earth pin on top and the basic layout was copied with the wire coming out on the same side as the earth pin. If you'd ever stepped on one barefoot you wouldn't think English plugs were funny! They are a liability when packing your ca...
by jbudd
Wed Jul 14, 2021 9:49 pm
Forum: General discussion
Topic: Raspberry Pi Imager Default App for .gz on Windows
Replies: 8
Views: 248

Re: Raspberry Pi Imager Default App for .gz on Windows

It registers itself as a handler for zip/gz/xz/img . It doesn't do anything else. These additional file associations doesn't overwrite or remove what is already there though. If it only brought up RPi Imager then it means nothing else is associated with those files or somebody has selected the &quo...
by jbudd
Wed Jul 14, 2021 5:02 pm
Forum: General discussion
Topic: Auto Login or Not
Replies: 10
Views: 313

Re: Auto Login or Not

It's been a while since I've seen one of those big display screens way up on a wall proudly showing "press shift alt blah to log in". Was that Windows 2000?
by jbudd
Wed Jul 14, 2021 4:56 pm
Forum: General discussion
Topic: Raspberry Pi Imager Default App for .gz on Windows
Replies: 8
Views: 248

Re: Raspberry Pi Imager Default App for .gz on Windows

Ok. But my PC with the imager installed is windows 10.
by jbudd
Wed Jul 14, 2021 3:41 pm
Forum: General discussion
Topic: Auto Login or Not
Replies: 10
Views: 313

Re: Auto Login or Not

Autologin seems very wrong to me.

I can see that it makes sense for some dedicated Pi applications - a photo frame for example.

Surely never for the command line?

But I tried it and I'm still asked for the password when I connect to a headless Pi by ssh, regardless of startup options.
by jbudd
Wed Jul 14, 2021 1:32 pm
Forum: Troubleshooting
Topic: Very low wifi signal strength on 1 out of 4 RPI Zero Ws [problem found]
Replies: 4
Views: 161

Re: Very low wifi signal strength on 1 out of 4 RPI Zero Ws

Try swapping the power supplies/cables, screens and SD cards around to see if the problem stays with the same Pi or moves.
by jbudd
Wed Jul 14, 2021 12:56 pm
Forum: General discussion
Topic: Raspberry Pi Imager Default App for .gz on Windows
Replies: 8
Views: 248

Re: Raspberry Pi Imager Default App for .gz on Windows

I can't really answer. I have 7zip installed on the pc and I would have thought that was the default. I doubt very much if I would have downloaded a .gz file and selected "open with" RPiImager. And I try not to install many applications but when I do, at least some of them ask which file t...

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