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by rpdom
Tue May 19, 2020 1:47 pm
Forum: Raspberry Pi OS
Topic: [SOLVED] Can i add DebianUnstable repository to Raspbian to get the latest version of Firefox?
Replies: 6
Views: 267

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: 633

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: 140

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: 28
Views: 663

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: 164

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: 28
Views: 663

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: 174

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: 179

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: 334

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: 334

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: 566

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: 75785

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: 373

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: 566

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: 566

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: 40

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: 566

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: 1958

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: 89

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: 169

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: 221

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: 147

Re: Raspberry Pi and Alexa

Show us the error messages?

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