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by rpdom
Fri Aug 02, 2019 6:15 am
Forum: Beginners
Topic: How to enable SSH?
Replies: 5
Views: 209

Re: How to enable SSH?

If you have the Bonjour/Avahi service running on your Windows PC (it is included with itunes, I believe), you should be able to ssh to pi@raspberrypi.local without needing to know the address.
by rpdom
Thu Aug 01, 2019 10:27 pm
Forum: HATs and other add-ons
Topic: Stacking 2 TV Hats
Replies: 2
Views: 120

Re: Stacking 2 TV Hats

Proper HATs are not stackable. They have an ID EEPROM which has a fixed i2c address - apart from the PoE HAT which uses a different i2c address so that it can be stacked with another HAT.

On a fast enough Pi you could use a USB tuner or two.
by rpdom
Thu Aug 01, 2019 8:26 pm
Forum: Troubleshooting
Topic: Raspberry PI Model 2B not booting up (Nothing on Monitor display) after installing the latest 'Raspbian Buster w deskto
Replies: 7
Views: 195

Re: Raspberry PI Model 2B not booting up (Nothing on Monitor display) after installing the latest 'Raspbian Buster w des

I don't see the red LED blinking at all in that video. The green LED seems to be showing fairly normal start up activity.

Have you tried another HDMI cable or even another monitor?
by rpdom
Thu Aug 01, 2019 12:51 pm
Forum: General discussion
Topic: 64-bit weekly kernel autobuilds for RPi4 released (bcm2711_defconfig)
Replies: 81
Views: 5391

Re: 64-bit weekly kernel autobuilds for RPi4 released (bcm2711_defconfig)

Someone did some comparisons of running a 32 bit OS and running a 64 bit OS on a Pi 4B. The performance was pretty much the same, but the 64 bit code used more memory.
by rpdom
Thu Aug 01, 2019 1:14 am
Forum: Troubleshooting
Topic: 3B+ dead (?) after plugging camera to display port
Replies: 11
Views: 434

Re: 3B+ dead (?) after plugging camera to display port

Printing "Display" and "Camera" on the board, expecting people to see that, hit the internet, or asking here, to discover or confirm which should be used rather then guessing or making a wrong assumption is not unreasonable. As far as I see, that is already printed on all Pi models I own. I think t...
by rpdom
Thu Aug 01, 2019 1:11 am
Forum: General discussion
Topic: So What OS Works With Pi4 4gb?
Replies: 19
Views: 1057

Re: So What OS Works With Pi4 4gb?

I wouldn't expect your laptop to boot from a Raspbian card at all. The hardware is completely different. The same goes for any OS that is built to be used with a Pi.
by rpdom
Wed Jul 31, 2019 4:47 pm
Forum: Networking and servers
Topic: SSH on External IP -- how to
Replies: 12
Views: 268

Re: SSH on External IP -- how to

So how to do I know if the external (ISP IP address) is fixed? You will be paying extra to your ISP for a fixed IP address. Sometimes you will be lucky, my Virgin Media IP address stays the same most of the time. Occasionally I have to reset things. Secondly when I putty from location a to server a...
by rpdom
Wed Jul 31, 2019 3:27 pm
Forum: Networking and servers
Topic: SSH on External IP -- how to
Replies: 12
Views: 268

Re: SSH on External IP -- how to

Is there a way to test it inside before going out to give me a sense of knowing it is going to work? Not usually. Many routers will not support what is known as "hairpin routing" where they have to route back their external address into the internal network. They only allow outbound, inbound, or di...
by rpdom
Wed Jul 31, 2019 2:51 pm
Forum: Bare metal, Assembly language
Topic: Stupid Pi 4 question
Replies: 6
Views: 359

Re: Stupid Pi 4 question

Well, the people who did the customisation for Raspbian to get it working for the Pi 4B are the same people who will be updating the documentation in a format that is suitable for us to use once they have all the quirks sorted out. Internal memos and documentation may be fine for them to work with (...
by rpdom
Wed Jul 31, 2019 5:27 am
Forum: General discussion
Topic: How to light a long cable of led using raspberry ?
Replies: 4
Views: 173

Re: How to light a long cable of led using raspberry ?

Sometimes you will need some extra driver circuitry to step up the 3.3V GPIO output from the Pi for the Neopixels to work. That is quite simple to build from a transistor and a couple of resistors. Sometimes they will work without that (the few strings I've got are fine on Pi Zeroes. Changing a sing...
by rpdom
Tue Jul 30, 2019 9:37 pm
Forum: Raspbian
Topic: Update procedure too slow on a Pi 3B+
Replies: 25
Views: 821

Re: Update procedure too slow on a Pi 3B+

It's like plugging a USB3 device into a USB2 socket. It will work, but it won't be very fast.
by rpdom
Tue Jul 30, 2019 7:51 pm
Forum: Networking and servers
Topic: Setting up "basic" mail
Replies: 5
Views: 1200

Re: Setting up "basic" mail

The "spam" thing is one reason I don't run my external mailserver on a Pi. It's not a problem with the Pi, which is perfectly capable of running it, but because the IP address will resolve to my ISP connection, not my mailserver on a reverse lookup. Instead I use a cheap VPS running Debian with a Do...
by rpdom
Tue Jul 30, 2019 6:08 pm
Forum: General discussion
Topic: Is anything from "troubles" deleted?
Replies: 9
Views: 400

Re: Is anything from "troubles" deleted?

There are no AIs controlling this BB. It is just humans, all volunteers including those that work for Raspberry Pi. Mostly the posting standards are: Be nice. Don't post the same thing twice. Don't reply to a very old post unless your reply is really relevant. Don't "hijack" someone else's thread wi...
by rpdom
Tue Jul 30, 2019 5:46 pm
Forum: Off topic discussion
Topic: DARPA 3DSoC
Replies: 26
Views: 2132

Re: DARPA 3DSoC

I also did try to etch my own PCB's, that wasn't a success, the yellow stuff stained the sink, and I got a nasty reprimand from my parents, as the stains were very hard to remove and stained the porcelain sink for months. I did a few of those. I still have some plain boards and a bottle of that Fer...
by rpdom
Tue Jul 30, 2019 11:16 am
Forum: Off topic discussion
Topic: DARPA 3DSoC
Replies: 26
Views: 2132

Re: DARPA 3DSoC

jamesh wrote:
Tue Jul 30, 2019 11:07 am
PCB routing has definitely changed....
It certainly has.

I remember being given some computer circuits to look at when I was in school. Some of them had tiny valves on them. Some didn't even use boards, just tag connectors with the components soldered on.
by rpdom
Tue Jul 30, 2019 10:28 am
Forum: Beginners
Topic: RPI Projects
Replies: 2
Views: 99

Re: RPI Projects

That depends on the project and what resources it uses. The Pi is a Linux system. Most of the software it runs also runs on other Linux systems, including PCs and Macs running Linux. Some code will work on most Linux systems, depending on the language it is written in. Python for example is almost u...
by rpdom
Tue Jul 30, 2019 9:54 am
Forum: Automation, sensing and robotics
Topic: 5v on GPIO to power I2C board
Replies: 5
Views: 176

Re: 5v on GPIO to power I2C board

Yes, as long as they don't take too much power. Generally it is also safe to power the Pi through those pins, but you have to take in to account that there is no fuse if you do it that way (Pi 0 and 4 don't have fuses anyway). The official PoE HAT powers the Pi 3B+ and 4B through those pins. With i2...
by rpdom
Tue Jul 30, 2019 7:37 am
Forum: Graphics, sound and multimedia
Topic: Historical high resolution graphics on the Raspberry Pi
Replies: 35
Views: 3252

Re: Historical high resolution graphics on the Raspberry Pi

Interesting! However, if vector displays don't have good fill rate, can't modern hardware like the Pi, drive a vector display to 'fill with vectors'? I mean, if a GPU is 1000x faster than a video chip of 1980, wouldn't it make sense there's access to 1000x more vectors? You still don't understand v...
by rpdom
Tue Jul 30, 2019 7:31 am
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 807
Views: 76471

Re: Raspberry Pi 4 Thread - general discussion

You don't need to use the official keyboard or mouse. Most USB keyboards and meeces will work with the Pi.

The rest of your post sounds like a bit of a rant, but I'll just ignore you being "surly" ;-)
by rpdom
Tue Jul 30, 2019 6:07 am
Forum: Advanced users
Topic: How-to procedure to boot from a USB spinning hard disk
Replies: 9
Views: 367

Re: How-to procedure to boot from a USB spinning hard disk

andrum99 wrote:
Mon Jul 29, 2019 11:10 pm
Andyroo wrote:
Mon Jul 29, 2019 11:02 pm
the HDD I have is already resized by using Etcher to image first :lol:
I wasn't aware etcher resized the root partition after writing it to the disc. Are you sure it does this?
No, it doesn't. The partition gets resized at first boot.
by rpdom
Mon Jul 29, 2019 9:03 pm
Forum: Troubleshooting
Topic: PI 4B video blanking
Replies: 9
Views: 254

Re: PI 4B video blanking

HankB wrote:
Mon Jul 29, 2019 7:11 pm
Can you confirm that the when the new firmware is vetted, it will be delivered and installed via apt?
Yes. That is the case. The raspberrypi-bootloader and raspberrypi-kernel packages contain the relevant files once they have been tested and deemed suitable for general release.
by rpdom
Mon Jul 29, 2019 8:49 pm
Forum: Beginners
Topic: Web server files on usb HDD
Replies: 14
Views: 255

Re: Web server files on usb HDD

Or you could put an entry in /etc/fstab to mount the USB drive on /var/www/html.
by rpdom
Mon Jul 29, 2019 6:57 pm
Forum: Troubleshooting
Topic: PI 4B video blanking
Replies: 9
Views: 254

Re: PI 4B video blanking

rpi-update is the standard way to update firmware. rpi-update was the old standard way to update the kernel and "firmware" before there was a standard apt package for them (about 6 years ago!). Now it is packaged and updated with apt upgrade. rpi-update is still around and will upgrade to the lates...
by rpdom
Mon Jul 29, 2019 6:45 pm
Forum: General discussion
Topic: does not work
Replies: 4
Views: 252

Re: does not work

It it is a P 1, 2 or 3 you may have "blown" the fuse. If you leave it for 24 hours without power the fuse should heal itself. On a Pi Zero or 4 there is no fuse, but you may have killed the power supply. Try with another power supply. Shorting 5V to GND is unlikely to kill the Pi. Shorting 5V to any...
by rpdom
Mon Jul 29, 2019 6:24 pm
Forum: Advanced users
Topic: How to control several Raspberry pi s from faraway ( From UK to India)
Replies: 6
Views: 249

Re: How to control several Raspberry pi s from faraway ( From UK to India)

Summary: Set up a public server. Then have the Raspberry Pi's ssh into the public server with a reverse ssh tunnel. Then ssh into your public server, and hop from there to any of the Raspberry Pi's. I use something like this, but using VPN instead of SSH tunnels and two public virtual servers. One ...

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