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by rpdom
Wed May 20, 2020 7:21 am
Forum: General discussion
Topic: Setup local repository.
Replies: 7
Views: 542

Re: Setup local repository.

Yes, that will work. I used the Proxy method of configuration, which means I only have to create one new file and not touch the existing configuration. I create /etc/apt/apt.conf.d/02proxy with this in it (change the IP address of the apt-cacher-ng server to suit your config) Acquire::http::proxy "h...
by rpdom
Wed May 20, 2020 7:15 am
Forum: Troubleshooting
Topic: Overheating!
Replies: 12
Views: 387

Re: Overheating!

I'm not sure what SoC or headless mean. SoC means System on a Chip. It is the main chip that runs the PI. CPU, GPU and IO controller (and more) all in one chip. Headless means running a system without a screen or mouse or keyboard. The only connections to it are by the network or other alternatives.
by rpdom
Wed May 20, 2020 6:59 am
Forum: Troubleshooting
Topic: Pins 27 and 28: strange behaviour at boot
Replies: 9
Views: 206

Re: Pins 27 and 28: strange behaviour at boot

They are also used internally for other functions like the camera and power controller. It is best not to use those pins for anything other than a HAT EEPROM.
by rpdom
Wed May 20, 2020 6:52 am
Forum: Troubleshooting
Topic: Raspberry Pi ignores changes to wpa_supplicant.conf
Replies: 4
Views: 273

Re: Raspberry Pi ignores changes to wpa_supplicant.conf

Does it make any difference if you put the freq_list inside the network configuration block?

I'm just guessing here as my Pi 4B is using wired network, not wireless, so I can't test it.
by rpdom
Wed May 20, 2020 6:36 am
Forum: Troubleshooting
Topic: ionice does not function on Raspbian 10
Replies: 5
Views: 140

Re: ionice does not function on Raspbian 10

On any of 4 different RPi 3s that I have, the system will simply freeze until dd has completed. For example, I am unable to ssh into the system until dd has completed. This is perhaps expected, the sd card has poor performance. No, it is not to be expected. Unless the SD card is faulty, or there is...
by rpdom
Wed May 20, 2020 6:22 am
Forum: Troubleshooting
Topic: REALLY slow ext3 USB drive format
Replies: 22
Views: 383

Re: REALLY slow ext3 USB drive format

I've just run a test on one of my Seagate Expansion 2TB drives on a PI 2B. USB2 obviously. Just copying a large file to another file on the same drive using rsync, then a sync afterwards to make sure the buffers are flushed to disk. The file is 4.4GB. It took 540 seconds, so that's a transfer rate o...
by rpdom
Wed May 20, 2020 6:20 am
Forum: Troubleshooting
Topic: Pins 27 and 28: strange behaviour at boot
Replies: 9
Views: 206

Re: Pins 27 and 28: strange behaviour at boot

That is entirely relevant.

It's not for nothing that on some of the official pinouts those pins are marked "Reserved".
by rpdom
Tue May 19, 2020 7:46 pm
Forum: General discussion
Topic: [Superseded] Pi 4B USB Host Boot
Replies: 39
Views: 2053

Re: Pi 4B USB Host Boot

Something like that. I did get a letter to say I should stay indoors for 12 weeks, but I checked with my GP and confirmed it had been sent in error. Even so, I only leave the house to get food and medication. My wife hasn't left the house since this thing started. I want to visit my father and see i...
by rpdom
Tue May 19, 2020 6:06 pm
Forum: General discussion
Topic: [Superseded] Pi 4B USB Host Boot
Replies: 39
Views: 2053

Re: Pi 4B USB Host Boot

I miss the office, it's much more fun banning morons when we can all have a good laugh about it. Wow, I thought James was the only "Rottie Mod" on here. Clearly staying indoors for 9 weeks hones your moderation tolerances. It's not for nothing that their names are in green. Don't make them angry. Y...
by rpdom
Tue May 19, 2020 2:04 pm
Forum: Troubleshooting
Topic: Pis power supply specific/selective ?
Replies: 29
Views: 632

Re: Pis power supply specific/selective ?

Sorry, can't do a picture or recall the actual diameter of the wires. It is twin multicore wire rated at 3A. I got a 100m reel of it from Maplin many years back.
by rpdom
Tue May 19, 2020 1:47 pm
Forum: Raspbian
Topic: [SOLVED] Can i add DebianUnstable repository to Raspbian to get the latest version of Firefox?
Replies: 6
Views: 261

Re: Can i add DebianUnstable repository to Raspbian to get the latest version of Firefox?

Yes, that should probably work on a Pi 4B. Just don't ask for help here if it goes wrong ;-)

You'll have made a backup first, of course. :)
by rpdom
Tue May 19, 2020 1:28 pm
Forum: Troubleshooting
Topic: Pis power supply specific/selective ?
Replies: 29
Views: 632

Re: Pis power supply specific/selective ?

My Pi 1B with the latest Raspbian Lite appears to use around 380mA when idle at the command line. My Pi 0W also with the latest Raspbian Lite appears to use around 80mA when idle at the command line. The tester I used may not be accurate, but I used the same tester, power cable and power supply for ...
by rpdom
Tue May 19, 2020 8:25 am
Forum: Troubleshooting
Topic: Apache2 server times out on public IP address
Replies: 8
Views: 157

Re: Apache2 server times out on public IP address

Have you tried rebooting the router?
by rpdom
Tue May 19, 2020 6:53 am
Forum: Beginners
Topic: Re: SDA and SCL pins in use on I2C
Replies: 6
Views: 139

Re: SDA and SCL pins in use on I2C

Yes, as long as the sensors have different bus addresses. For instance you couldn't easily connect two BME280s to the same bus because they have the same device address. Some devices have a way of changing their address.
by rpdom
Mon May 18, 2020 5:41 pm
Forum: Troubleshooting
Topic: Problem with temperature sensor ds18b20
Replies: 27
Views: 631

Re: Problem with temperature sensor ds18b20

Yes, you can have more than one 1-wire bus on the Pi. You just add extra lines to config.txt

But you may not need that. Each one-wire bus connection is capable of supporting several devices.

As pcmanbob said, the DHT11 isn't a 1-wire device. It uses its own communication format.
by rpdom
Mon May 18, 2020 4:48 pm
Forum: Networking and servers
Topic: ONE IP address blocked by Raspberry Pi
Replies: 4
Views: 163

Re: ONE IP address blocked by Raspberry Pi

.1 is normally reserved for the router itself. The rest are usable.
by rpdom
Mon May 18, 2020 4:47 pm
Forum: Troubleshooting
Topic: Problem with temperature sensor ds18b20
Replies: 27
Views: 631

Re: Problem with temperature sensor ds18b20

Yes, modifying the config.txt file to add a dtoverlay option is (almost) the same as the sudo dtoverlay command.

Modifying the file is preferable.
by rpdom
Mon May 18, 2020 2:51 pm
Forum: Beginners
Topic: Raspberry PI as a OTG device?
Replies: 6
Views: 171

Re: Raspberry PI as a OTG device?

The built in USB hub chip prevents the Pi3 being used as an OTG device.
by rpdom
Mon May 18, 2020 10:22 am
Forum: Gaming
Topic: Install Windows app
Replies: 3
Views: 177

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: 327

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: 327

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: 557

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: 75661

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: 371

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...

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