Go to advanced search

by rpdom
Mon Aug 13, 2018 6:44 pm
Forum: General discussion
Topic: (Solved)Which models of USB HDD work when connected directly to the PI?
Replies: 13
Views: 328

Re: Which models of USB HDD work when connected directly to the PI?

I've used Seagate Expansion 2TB USB3.0 and an Intenso 2TB USB3.0 drive without any problems.
by rpdom
Sun Aug 12, 2018 5:16 pm
Forum: General discussion
Topic: (Solved) Is using a non powered USB HDD possible with a Pi3B+ ?
Replies: 21
Views: 498

Re: Is using a non powered USB HDD possible with a Pi3B+ ?

Linux will wait for USB drives to ready before starting the boot process. So spin up time is not relevant. If booting from the external drive, Linux hasn't even been loaded at this point. I understand that the internal boot ROM on the 3B+ is slightly different from the one in the 3B. Drives that wo...
by rpdom
Sun Aug 12, 2018 8:10 am
Forum: General discussion
Topic: (Solved) Is using a non powered USB HDD possible with a Pi3B+ ?
Replies: 21
Views: 498

Re: Is using a non powered USB HDD possible with a Pi3B+ ?

It seems to depend on the drive. I have a Pi 3B+ (running headless) that boots and runs happily from a 2TB USB drive using just the official Pi power supply. I also have a Pi 3B and a Pi 2B that use similar 2TB drives for storage, but boot from SD cards. I couldn't get the 3B to boot directly from H...
by rpdom
Sat Aug 11, 2018 5:48 pm
Forum: Raspbian
Topic: Unallocated space on Raspbian
Replies: 9
Views: 196

Re: Unallocated space on Raspbian

TrooperZ wrote:
Sat Aug 11, 2018 5:45 pm
Well, can I reformat them? Will it do any harm?
You can create partitions in that space and try and format them. Depending on the file system you may succeed.
by rpdom
Sat Aug 11, 2018 5:43 pm
Forum: Raspbian
Topic: Unallocated space on Raspbian
Replies: 9
Views: 196

Re: Unallocated space on Raspbian

Too small to be any use. I believe the reason for these gaps is to try and make sure the partitions are aligned to an SD card page boundary for performance reasons.
by rpdom
Fri Aug 10, 2018 6:47 pm
Forum: C/C++
Topic: How do I debug stdin?
Replies: 12
Views: 242

Re: How do I debug stdin?

1. I don really understand this piece of code: do { selected = fgetc(stdin); } while (selected == '\n'); It is something I found in a book and it should somehow make make the loop ignore the LF, but I don't understand why/how it does it - and it looks like it's not really working...? :-/ Can someon...
by rpdom
Fri Aug 10, 2018 5:58 pm
Forum: Troubleshooting
Topic: Issue with Multi-Camera adapter
Replies: 5
Views: 120

Re: Issue with Multi-Camera adapter

Mitek wrote:
Fri Aug 10, 2018 3:01 pm
rpdom, you are a legend !
Hehe. Given that I've forgotten to change my "Location" back to reality, one might even say a Wizzard. (Some people will get it :lol: )
by rpdom
Fri Aug 10, 2018 5:43 pm
Forum: Beginners
Topic: How to detect an old style wired doorbell only - nothing else
Replies: 20
Views: 372

Re: How to detect an old style wired doorbell only - nothing else

My doorbell uses a Pi. The long leads from the button are connected to the 5v from the pi and a resistor to drive the input of an opto-isolator. One side of the output stage of the opto is connected via a resistor to 3.3V and a GPIO. The other side is connected to ground. When the button is pressed ...
by rpdom
Thu Aug 09, 2018 12:23 pm
Forum: Troubleshooting
Topic: jackdbus crashing regularly in raspbian after update.
Replies: 10
Views: 158

Re: jackdbus crashing regularly in raspbian after update.

Which libdbus have you got installed? I think the current package for Raspbian is libdbus-1-3 and the dev version is libdbus-1-dev which is available in Raspbian.
by rpdom
Wed Aug 08, 2018 6:42 pm
Forum: C/C++
Topic: RasberryPi Zero W LED does not turn ON and does not set the GPIO high
Replies: 25
Views: 342

Re: RasberryPi Zero W LED does not turn ON and does not set the GPIO high

Which pin are you using for Ground (0V) when doing your measurements?

Have you tried measuring the 3.3V between pins 1 and 6 to test your meter?
by rpdom
Wed Aug 08, 2018 6:31 pm
Forum: Beginners
Topic: Trying to move hidden contents of hidden folder [SOLVED]
Replies: 4
Views: 118

Re: Trying to move hidden contents of hidden folder

Are . and .. files? . is a short name for the directory itself. .. is a short name for the parent directory. If you do "cd ." you stay exactly where you are. If you do "cd .." you change to the next directory up. The only file I can see in that directory is .lock and you may need to specify the fil...
by rpdom
Wed Aug 08, 2018 6:06 pm
Forum: Troubleshooting
Topic: How to set WiFi on Raspberry pi Zero W
Replies: 29
Views: 378

Re: How to set WiFi on Raspberry pi Zero W

Windows text files end each line with a Carriage Return, then a Line Feed (CRLF). Linux/Unix uses just the Line Feed (LF) code. If you use a Windows format editor you will end up with an unwanted CR on the end of each line, which makes the line invalid. Raspbian will see: country=DE^M (^M is how the...
by rpdom
Wed Aug 08, 2018 5:43 pm
Forum: C/C++
Topic: RasberryPi Zero W LED does not turn ON and does not set the GPIO high
Replies: 25
Views: 342

Re: RasberryPi Zero W LED does not turn ON and does not set the GPIO high

DirkS wrote:
Wed Aug 08, 2018 5:40 pm
I cannot find wiringpi pin 18...
It was on the extra (not-fitted) GPIO header on the later Pi 1B models.
by rpdom
Wed Aug 08, 2018 5:37 pm
Forum: C/C++
Topic: RasberryPi Zero W LED does not turn ON and does not set the GPIO high
Replies: 25
Views: 342

Re: RasberryPi Zero W LED does not turn ON and does not set the GPIO high

I don't see the Pin scheme (Board, BCM, WiringpI) being set in that code. I think the WiringPi library defaults to its own odd naming conventions, in which case WiringPi 18 does not exist on the current boards.
by rpdom
Wed Aug 08, 2018 5:10 pm
Forum: Advanced users
Topic: What value are those parts?
Replies: 36
Views: 884

Re: What value are those parts?

Burngate wrote:
Wed Aug 08, 2018 5:01 pm
Interesting thought. The silk-screen identifiers are irrelevant for assembly
So why do some components have them?
Maybe for occasional manual production checks?
by rpdom
Wed Aug 08, 2018 7:47 am
Forum: Advanced users
Topic: 3B+ trrs jack audio voltage level
Replies: 14
Views: 421

Re: 3B+ trrs jack audio voltage level

jjh76 wrote:
Wed Aug 08, 2018 6:42 am
So, If I were to use a standard stereo or mono audio cable the video would just go to ground?
Yes. The video circuit is designed to cope with that.

I'm not sure that a mono cable will be ok. Probably, but I'd have to check the output circuit to make sure.
by rpdom
Wed Aug 08, 2018 6:40 am
Forum: Troubleshooting
Topic: Issue with Multi-Camera adapter
Replies: 5
Views: 120

Re: Issue with Multi-Camera adapter

Board pin 7 is GPIO 4, which is the default pin used by the w1 (one-wire) driver - if enabled. Make sure you don't have dtoverlay=w1-gpio in /boot/config.txt and the w1_gpio module isn't loaded (unless configured to use another gpio).
by rpdom
Wed Aug 08, 2018 5:49 am
Forum: General discussion
Topic: Powering a USB hub from third-party 5V 2A solder pads
Replies: 10
Views: 285

Re: Powering a USB hub from third-party 5V 2A solder pads

The page you originally linked to is referring to the original Pi model B(1). That had fuses on each of the two USB ports to limit the current to under 140mA. You'd be better off looking at the "Power Requirements" section of the FAQ , which gives a list of each of the major models, the recommended ...
by rpdom
Mon Aug 06, 2018 9:38 pm
Forum: Raspbian
Topic: Rpi3+ Booting from USB-stick - Why is ACT LED blinking?
Replies: 4
Views: 163

Re: Rpi3+ Booting from USB-stick - Why is ACT LED blinking?

LTolledo wrote:
Mon Aug 06, 2018 9:27 pm
the solution, changing the copy of the file sdtweak.dtbo
I think it isn't necessary to change sdtweak.dtbo if you have an up-to-date Raspbian system. I just put the line in my config.txt and the LED stopped flashing.
by rpdom
Mon Aug 06, 2018 10:51 am
Forum: Raspbian
Topic: Static IP- Why... How
Replies: 8
Views: 173

Re: Static IP- Why... How

One way to get a "static" IP is to configure it in your router/DHCP server. You can usually associate the interface's MAC address with a particular IP address and then you don't have to change anything on the Pi.
by rpdom
Mon Aug 06, 2018 7:03 am
Forum: Raspbian
Topic: Pi as webserver- security
Replies: 2
Views: 86

Re: Pi as webserver- security

When you install Apache on a system like Raspbian, it creates a new user www-data that Apache runs under. Often this user is given read only access to the web pages and another user will be the owner and editor of them.
by rpdom
Sun Aug 05, 2018 9:05 pm
Forum: Official Foundation Display
Topic: How To Rotate Screen 180 Degrees?
Replies: 25
Views: 25757

Re: How To Rotate Screen 180 Degrees?

Piefurz wrote:
Sun Aug 05, 2018 6:28 pm
Just because it can be flipped in software to correct the oops doesn't mean that is the best fix. Software fixes to hardware problems probable make the processor work harder.
It's not a software fix. It instructs the GPU to output in the "correct" format. The CPU has no additional work to do.
by rpdom
Sun Aug 05, 2018 5:44 pm
Forum: Beginners
Topic: how install owfs from GitHub
Replies: 15
Views: 260

Re: how install owfs from GitHub

sudo apt-get install libtool
by rpdom
Sun Aug 05, 2018 5:41 pm
Forum: Beginners
Topic: fstab query re `nofail` option
Replies: 5
Views: 121

Re: fstab query re `nofail` option

After reading a number of forum postings/blogs/etc, it seems to me that this issue is not consistent across all platforms and releases. But that may be due to my ignorance regarding how all of the "moving parts" play together. Perhaps this is not a "bug" at all but a "feature", and I simply have no...
by rpdom
Sun Aug 05, 2018 4:41 pm
Forum: Graphics, sound and multimedia
Topic: Driver for Behringer UMC202HD ?
Replies: 11
Views: 274

Re: Driver for Behringer UMC202HD ?

ultrarunner2018 wrote:
Sun Aug 05, 2018 3:37 pm
And I would assume that HDMI will also record audio, as there is an "audio in" jack on the monitor as well.
No, the Pi has no built-in audio input capability.

Go to advanced search