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by rpdom
Mon May 18, 2020 10:22 am
Forum: Gaming
Topic: Install Windows app
Replies: 3
Views: 184

Re: Install Windows app

No
by rpdom
Mon May 18, 2020 9:39 am
Forum: Troubleshooting
Topic: Pi Zero Internet speed slower with Ethernet cable vs WiFi
Replies: 7
Views: 184

Re: Pi Zero Internet speed slower with Ethernet cable vs WiFi

fruitoftheloom wrote:
Mon May 18, 2020 9:07 am
especially the DM9601
The DM9601 is a 100Mb ethernet chip on a 12Mb USB interface. It won't get more than about 10Mb on a Pi or a PC.
by rpdom
Mon May 18, 2020 8:57 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: i2c on RPI3B+ and RPI4
Replies: 10
Views: 340

Re: i2c on RPI3B+ and RPI4

Yes, it does sound like a fault. Swapping the card from a Pi 4B to a 3B is fine and the GPIO header has the same pinouts and signal levels for those pins. The only other thing I can think of is that something has been set in config.txt in the [pi4] section instead of the [all] or general section as ...
by rpdom
Mon May 18, 2020 7:12 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: i2c on RPI3B+ and RPI4
Replies: 10
Views: 340

Re: i2c on RPI3B+ and RPI4

cleverca22 wrote:
Sun May 17, 2020 9:26 pm
pins 3/5 map to gpio0/gpio1
Only on the original Pi 1B. On all other Pis they map to GPIO2 and GPIO3.
by rpdom
Sun May 17, 2020 5:27 pm
Forum: Ubuntu
Topic: rpi-eeprom on Ubuntu 20.04
Replies: 21
Views: 582

Re: rpi-eeprom on Ubuntu 20.04

I did warn it might not work.

I run a plain bullseye on my test Pi, but just the lite version.

I'm not sure why that install didn't work. I think it should have, but there might be bits I have missed. I'd have to set up a system with buster and add bullseye to test it.
by rpdom
Sun May 17, 2020 5:09 pm
Forum: Other projects
Topic: Adding a 5V Fan to a Raspberry Pi 3 Model B and having control of it
Replies: 51
Views: 76014

Re: Adding a 5V Fan to a Raspberry Pi 3 Model B and having control of it

IN4007 would be fine. It is only a version of the IN4001 that can cope with higher voltages for extended times, which is unimportant in this case.
by rpdom
Sun May 17, 2020 5:03 pm
Forum: Advanced users
Topic: Raspbiasn Buster: script via cronjob not working properly
Replies: 17
Views: 375

Re: Raspbiasn Buster: script via cronjob not working properly

a tip, read a good book, for example a "terry Pratchett" novel. (i hope your libraries and/or bookshops are open) I bought half a dozen books just in time. I like your taste in books :-) I'm sure Terry would have loved the Pi if he had time to get in to it. (I have a couple of bookcases full of his...
by rpdom
Sun May 17, 2020 4:59 pm
Forum: Ubuntu
Topic: rpi-eeprom on Ubuntu 20.04
Replies: 21
Views: 582

Re: rpi-eeprom on Ubuntu 20.04

To set bullseye to low priority (ie. ignore unless specifically requested), create a file /etc/apt/preferences.d/bullseye with these contents # Pin bullseye to low priority Package: * Pin: release n=bullseye Pin-Priority: 50 To install packages from bullseye you would have to (for example) apt insta...
by rpdom
Sun May 17, 2020 4:56 pm
Forum: Ubuntu
Topic: rpi-eeprom on Ubuntu 20.04
Replies: 21
Views: 582

Re: rpi-eeprom on Ubuntu 20.04

I wouldn't recommend running bullseye yet. I don't know how well it is supported. Certainly the Pi specific changes won't be fully supported.

Adding the minimum number of packages to add openssh 8.2 should work, but remember that bullseye is not stable yet and changes all the time.
by rpdom
Sun May 17, 2020 4:51 pm
Forum: Troubleshooting
Topic: Getting Brother-Printer drivers to work
Replies: 2
Views: 44

Re: Getting Brother-Printer drivers to work

My next step was to try using the x86 PPD in a wrapper, but thankfully didn't have to go that far! That would have been pointless, as no x86 driver can work on a system without an x86 CPU PPD files aren't architecture dependant unless they refer to specific filter programs, which may be the case.
by rpdom
Sun May 17, 2020 3:28 pm
Forum: Troubleshooting
Topic: Pi 2 B analog audio channel problem
Replies: 3
Views: 87

Re: Pi 2 B analog audio channel problem

I'm fairly certain I'm using the correct 3.5 mm plug (it has 4 segments). Is this a wiring issue or a configuration issue? Any way to fix it? If you want only audio, just use a standard 3 connection stereo plug to RCA. This will short out the video output, but it is designed to work like that. The ...
by rpdom
Sun May 17, 2020 3:22 pm
Forum: Ubuntu
Topic: rpi-eeprom on Ubuntu 20.04
Replies: 21
Views: 582

Re: rpi-eeprom on Ubuntu 20.04

I would just add the bullseye Raspbian repo and pin it at low priority, then install the openssh server from there. (After taking a backup of the system first). I'm running bullseye on one of my test Pi Zeroes and that has 8.2 installed (only Raspbian Lite though). Do this at your own risk, but it i...
by rpdom
Sun May 17, 2020 2:41 pm
Forum: General discussion
Topic: Running x86_64 apps on Raspberry Pi
Replies: 29
Views: 1979

Re: Running x86_64 apps on Raspberry Pi

Worth commenting on running x86 on ARM, and why its a problem. This requires the x86 instruction set to be emulated. That is a performance hit of at least 10x per clock cycle ie something that took one clock cycle on x86 now takes 10 cycles on ARM The only X86 type emulator (well it was actually an...
by rpdom
Sun May 17, 2020 9:46 am
Forum: Ubuntu
Topic: Transfer system from Pi3 to Pi4
Replies: 2
Views: 90

Re: Transfer system from Pi3 to Pi4

I doubt the firmware will be an issue, it certainly isn't for Raspbian Buster, but I don't know about Ubuntu.

This question would be better off asked in the Ubuntu section of the forums. I'll ask for it to be moved there.
by rpdom
Sat May 16, 2020 5:31 pm
Forum: Python
Topic: can anyone tell me what is the purpose of impoting following librarys
Replies: 4
Views: 176

Re: can anyone tell me what is the purpose of impoting following librarys

You should probably edit your post to remove your email credentials from the code!
by rpdom
Sat May 16, 2020 11:16 am
Forum: Beginners
Topic: I2C problems with BH1750 photoresistor
Replies: 7
Views: 222

Re: I2C problems with BH1750 photoresistor

It is odd that the i2cdetect doesn't show all addresses connected, just certain blocks. That is not the usual failure pattern. I have a feeling that the sensor itself could be faulty. What does i2cdetect show if you just disconnect the SDA wire from the sensor? Leave the other end of that wire conne...
by rpdom
Sat May 16, 2020 6:36 am
Forum: Beginners
Topic: Raspberry Pi and Alexa
Replies: 4
Views: 151

Re: Raspberry Pi and Alexa

Show us the error messages?
by rpdom
Fri May 15, 2020 4:30 pm
Forum: Troubleshooting
Topic: Pis power supply specific/selective ?
Replies: 29
Views: 634

Re: Pis power supply specific/selective ?

The OP specifies that he has an (original) Model A. That board defaults to 700MHz. The Pi0 should default to 1GHz, so the Model A ought to draw slightly less current than the Pi0. Not necessarily ;-) The original model A had inefficient linear voltage regulators that wasted a lot of power as heat. ...
by rpdom
Fri May 15, 2020 3:25 pm
Forum: Troubleshooting
Topic: Pis power supply specific/selective ?
Replies: 29
Views: 634

Re: Pis power supply specific/selective ?

Hav0c wrote:
Fri May 15, 2020 3:09 pm
the power source is an android phone charger clone bought from the dollar store
Interesting, that power source is clearly marked 0.2A (200mA)
That's for the mains or the input. It clearly also says "O/P DC5.0V = 1.0A". I'm not sure I'd trust it though.
by rpdom
Fri May 15, 2020 12:55 pm
Forum: Off topic discussion
Topic: What do you guys store your pi boards in when not in use?
Replies: 29
Views: 1410

Re: What do you guys store your pi boards in when not in use?

I keep my PI's, SBC's and various microcontroller boards in see-through VHS tape cases, with 30 of those fitting a fold-flat plastic crate. It's easy to stick a label on top so one can quickly find what one is looking for. Wow, I have not seen a VHS tape for about two decades now. You must have a v...
by rpdom
Fri May 15, 2020 10:00 am
Forum: Advanced users
Topic: Raspbiasn Buster: script via cronjob not working properly
Replies: 17
Views: 375

Re: Raspbiasn Buster: script via cronjob not working properly

Have you tried sending the output from the cron to log files instead of /dev/null? Then you can look at them and hopefully see an error. I can see one issue with the script. You create a variable called "date", then refer to one called "datum". Also tar can be a bit fussy if you start the source pat...
by rpdom
Fri May 15, 2020 4:46 am
Forum: Troubleshooting
Topic: REALLY slow ext3 USB drive format
Replies: 22
Views: 392

Re: REALLY slow ext3 USB drive format

USB 3.0 drives can use up to 900mA of current, according to the USB 3.0 power spec, and that's pretty close to the 1.2A limit on the Pi's USB ports. If the drive is slightly out of spec (which wouldn't surprise me with Seagate, since their drives are often power pigs) I just had a look inside one o...
by rpdom
Thu May 14, 2020 4:59 pm
Forum: Troubleshooting
Topic: REALLY slow ext3 USB drive format
Replies: 22
Views: 392

Re: REALLY slow ext3 USB drive format

This Seagate drive seems incompatible with Linux drivers. Anybody else see this behavior? I do have a few Seagate Expansion drives I use with my Pis. Different models to yours, I believe. Most of them work fine, but one did start to get errors if it was running for any length of time. I think it go...
by rpdom
Thu May 14, 2020 3:35 pm
Forum: Troubleshooting
Topic: Pi Update not connecting
Replies: 3
Views: 95

Re: Pi Update not connecting

Botspot wrote:
Thu May 14, 2020 3:16 pm
Why are you using Raspbian Bullseye?
Why not? I do on one of my test Pis.
Reset your /etc/apt/sources.list, and you should be good to go.
That is not the problem. The message "Network in unreachable" even on the Buster connections point to a networking problem. It may be a problem with IPv6.
by rpdom
Thu May 14, 2020 9:19 am
Forum: Beginners
Topic: I2C compatibility issue
Replies: 6
Views: 167

Re: I2C compatibility issue

You don't need to connect the official touchscreen to pins 2 & 3 except on the very first Pi 1 series. The later models 1B+ moved that i2c bus to the screen cable instead of the GPIO pins. You can connect your DS1307 to pins 2 & 3 as normal and with the correct dtoverlay in /boot/config.txt it will ...

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