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by rpdom
Sun Jun 13, 2021 11:57 am
Forum: Other
Topic: Raspberry Pi OS or another Distribution for a systemd free server?
Replies: 25
Views: 1957

Re: Raspberry Pi OS or another Distribution for a systemd free server?

Generally I don't need automounting. When I insert a USB storage device it is usually because I want to format it, partition it or just install an image on it. On some of my Raspberries I do have devices that need to be mounted, but that is all at boot time, so I do that in other ways. Occasionally ...
by rpdom
Sun Jun 13, 2021 6:14 am
Forum: Camera board
Topic: Do I have a faulty csi port?
Replies: 4
Views: 147

Re: Do I have a faulty csi port?

I figured no one would see it in the original place it was posted. It fits in here. :) In that case what you should have done is to click the "Report Post" icon and ask that it be moved to the correct place. The moderators are very happy to do that for you. Too late now, They will have to...
by rpdom
Sun Jun 13, 2021 5:54 am
Forum: Automation, sensing and robotics
Topic: Looking to dim LEDs with a digital slider bar
Replies: 5
Views: 184

Re: Looking to dim LEDs with a digital slider bar

You may want to check this out: https://www.w3schools.com/nodejs/nodejs_raspberrypi_rgb_led_websocket.asp That looks like a decent way to control an RGB strip. Just a couple of things I noticed. He keeps saying that you need MOSFETs that will turn on at 5V or lower. Really they need to be 3.3V or l...
by rpdom
Sat Jun 12, 2021 5:19 pm
Forum: Troubleshooting
Topic: External disc (HDD, Pi 3, USB 2): Bad transfer rates
Replies: 10
Views: 217

Re: External disc (HDD, not SSD): Bad transfer rates

andrum99 wrote:
Sat Jun 12, 2021 4:42 pm
See sticky near the top of this forum: viewtopic.php?f=28&t=245931. Nothing to do with which filesystem the drive has on it.
Not applicable, as the OP is not using a Pi 4.
by rpdom
Sat Jun 12, 2021 2:40 pm
Forum: Troubleshooting
Topic: Raspberry Pi Server Issues
Replies: 6
Views: 167

Re: Raspberry Pi Server Issues

Crypto is used for a lot more than just mining currencies. Any secure connection, like SSH or VPN will use cryptography.
by rpdom
Sat Jun 12, 2021 1:59 pm
Forum: General discussion
Topic: Is it possible to receive data from the USB-C port of the Raspberry Pi 4?
Replies: 8
Views: 278

Re: Is it possible to receive data from the USB-C port of the Raspberry Pi 4?

Only if your iPad can supply the Pi with enough current at 5V. Otherwise you'll need to find some other way of powering it.
by rpdom
Sat Jun 12, 2021 8:45 am
Forum: General
Topic: PicoVGA - VGA/TV display on Raspberry Pico
Replies: 24
Views: 828

Re: PicoVGA - VGA/TV display on Raspberry Pico

I want to store a full framebuffer, so at 640x480 pixels that's 38.4 kb to store for each on/off colour channel. So I guess I could store three, single-bit colour channels in the Pico RAM -- provided they're packed properly. I think I'd look at having one word for red, one for green and one for blu...
by rpdom
Sat Jun 12, 2021 6:07 am
Forum: Raspberry Pi OS
Topic: Need help WIFI issue, was directed here from Retropie forum mod
Replies: 4
Views: 170

Re: Need help WIFI issue, was directed here from Retropie forum mod

I couldn’t get a definitive idea either of the exact chipset model used in that hubpiwi device. In the hubpiwi I've got, it has an RTL8188EUS chip on it. At least, that's what is printed on the chip. It might identify as something else. It's been a while since I've used it, so don't know if the rig...
by rpdom
Fri Jun 11, 2021 6:59 pm
Forum: Advanced users
Topic: Pi 2B Schematic help - PWM audio voltage divider?
Replies: 5
Views: 121

Re: Pi 2B Schematic help - PWM audio voltage divider?

Well, from a brief look at that schematic, I can see that U11 is powered from the 2.5V Audio supply rail. So giving it an input of 3.3V would exceed its supply voltage resulting in clipping of the output. First sentence is correct. Second one is not. The input and output signals of U11 are digital....
by rpdom
Fri Jun 11, 2021 6:51 pm
Forum: General discussion
Topic: ssd disk
Replies: 18
Views: 569

Re: ssd disk

W. H. Heydt wrote:
Fri Jun 11, 2021 6:47 pm
so the true limit is the single PCIe lane, at 4 Mt/s.

(Side note... an 'm' prefix is 'milli-', so 1mb/s would be 0.001 b/s.)
That would be very slow. Is the "t" in Mt/s "tortoises"?
by rpdom
Fri Jun 11, 2021 6:48 pm
Forum: Advanced users
Topic: Pi 2B Schematic help - PWM audio voltage divider?
Replies: 5
Views: 121

Re: Pi 2B Schematic help - PWM audio voltage divider?

Well, from a brief look at that schematic, I can see that U11 is powered from the 2.5V Audio supply rail. So giving it an input of 3.3V would exceed its supply voltage resulting in clipping of the output.
by rpdom
Fri Jun 11, 2021 6:21 pm
Forum: General discussion
Topic: ssd disk
Replies: 18
Views: 569

Re: ssd disk

Onq28 wrote:
Fri Jun 11, 2021 6:00 pm
I was thinking of something like the samsung portable SSD T5 wich has
read speed of 540 mb/s. I could go for higher speed but the usb bus of the Pi 4 is limited as far as i know to 480 mb/s.
That's just the USB2 speed. The two USB3 ports support up to 5000 mb/s between them.
by rpdom
Fri Jun 11, 2021 6:02 pm
Forum: Automation, sensing and robotics
Topic: 3 volt chip led with relay ?
Replies: 14
Views: 366

Re: 3 volt chip led with relay ?

Absolutely fine to run directly from a Pi and should be quite bright. Advice from rpdom, virtually always spot on, maybe not here though because that does not appear to be your typical T1-3/4 version but one of those higher power COB chips. Not sure but could be popular 2 watt or 5 watt so will not...
by rpdom
Fri Jun 11, 2021 5:09 pm
Forum: General discussion
Topic: Porting old Pi3 distribution to pi4.
Replies: 27
Views: 746

Re: Porting old Pi3 distribution to pi4.

My PC runs Ubuntu 20.04. If I would still have the harddisk from ubuntu 12.04 that would still work. Presumably from the same PC, so not surprising. It may not have all of the drivers needed for the newer hardware though. So why doesn't the older system work on pi4? There has to be an explanation o...
by rpdom
Fri Jun 11, 2021 3:50 pm
Forum: General
Topic: What are these duplicate function pins?
Replies: 6
Views: 262

Re: What are these duplicate function pins?

Yes, all can be connected to the SPI hardware. You just choose which ones that is.
by rpdom
Fri Jun 11, 2021 1:37 pm
Forum: General discussion
Topic: ssd disk
Replies: 18
Views: 569

Re: ssd disk

SSDs aren't that expensive now. You can put everything on one SSD. I have a Pi 4B running off a 120GB SSD with no SD card. The thing you have to watch with SSDs is the USB interfaces they use or the ones you use with them. Some use the JMS/JMicron controllers which don't support USB3 correctly. Avoi...
by rpdom
Fri Jun 11, 2021 11:48 am
Forum: Advanced users
Topic: What happens if the 5 V PSU input falls below the specification?
Replies: 14
Views: 431

Re: What happens if the 5 V PSU input falls below the specification?

Now I know that the Pi will complain at one point by displaying the lightning flash etc, but when the voltage falls further, does it simply crash or would this trigger a controlled shutdown? The background to this is that we have deployed a new batch of Pi Zeros The Pi Zero does not have the under ...
by rpdom
Fri Jun 11, 2021 10:57 am
Forum: General discussion
Topic: Understanding multiple HATs compatibility
Replies: 8
Views: 173

Re: Understanding multiple HATs compatibility

I've used multiple Hats, even ones with an ID eprom with no issues. If it doesn't have an ID eeprom, it isn't a HAT. Having multiple (proper) HATs on the same Pi will result in conflicts with the eeproms (except for the PoE HAT which uses a different eeprom address). If you are lucky they will work...
by rpdom
Fri Jun 11, 2021 10:40 am
Forum: Troubleshooting
Topic: Install node.js >= 12 on old Raspberry Pi 1 model B?
Replies: 9
Views: 219

Re: Install node.js >= 12 on old Raspberry Pi 1 model B?

I don't know why this doesn't work: sudo apt-get clean && apt-get autoremove E: Could not open lock file /var/lib/dpkg/lock - open (13: Permission denied) E: Unable to lock the administration directory (/var/lib/dpkg/), are you root? The sudo only works on one command at al time. the "...
by rpdom
Fri Jun 11, 2021 9:43 am
Forum: Troubleshooting
Topic: Permission denied error when login on SSH
Replies: 18
Views: 505

Re: Permission denied error when login on SSH

I see you are form Chelmsford...is the Prince Of orange pub still there? was my hang out when a student at Writtle Ag college/ Uni..back in 1987...Rayleigh HiFi too? The Prince of Orange closed many years ago. Rayleigh HiFi is still going as far as I know. You wouldn't recognise the city centre now...
by rpdom
Fri Jun 11, 2021 8:46 am
Forum: General discussion
Topic: Run video on webpage automatically after Boot
Replies: 18
Views: 558

Re: Run video on webpage automatically after Boot

The name is not important, but to make things clear you could call it ABC.sh

Filename extensions aren't used the same way in Linux as they are in Windows (for example). You can give a file any name you like.
by rpdom
Fri Jun 11, 2021 7:03 am
Forum: Troubleshooting
Topic: Install node.js >= 12 on old Raspberry Pi 1 model B?
Replies: 9
Views: 219

Re: Install node.js >= 12 on old Raspberry Pi 1 model B?

The problem is that old Raspberry Pi runs all kinds of services in my home network I was adding through the years and I don't even remember everything I installed 5-6 years ago. Don't worry, I fully understand that. I've got a Pi 2B that has been running loads of stuff on Raspbian Wheezy for years....
by rpdom
Fri Jun 11, 2021 6:56 am
Forum: Troubleshooting
Topic: Permission denied error when login on SSH
Replies: 18
Views: 505

Re: Permission denied error when login on SSH

Easiest way to disable the script is just add

Code: Select all

exit
as the second line. Then it won't do anything.

The rest of the script looks horrendous. I don't see how it can work properly. All those "sudo echo" lines are nonsense.
by rpdom
Fri Jun 11, 2021 6:19 am
Forum: Automation, sensing and robotics
Topic: Looking to dim LEDs with a digital slider bar
Replies: 5
Views: 184

Re: Looking to dim LEDs with a digital slider bar

You may want to check this out: https://www.w3schools.com/nodejs/nodejs_raspberrypi_rgb_led_websocket.asp That looks like a decent way to control an RGB strip. Just a couple of things I noticed. He keeps saying that you need MOSFETs that will turn on at 5V or lower. Really they need to be 3.3V or l...
by rpdom
Fri Jun 11, 2021 6:12 am
Forum: Troubleshooting
Topic: Install node.js >= 12 on old Raspberry Pi 1 model B?
Replies: 9
Views: 219

Re: Install node.js >= 12 on old Raspberry Pi 1 model B?

I suspect you won't get much luck running ancient Jessie. Upgrade to Buster if you can.

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