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by mooblie
Thu Sep 20, 2018 4:12 pm
Forum: General discussion
Topic: Shut down rpi with a keyboard key combo
Replies: 9
Views: 236

Re: Shut down rpi with a keyboard key combo

k-pi wrote:
Thu Sep 20, 2018 9:33 am
Rather than sudo poweroff, I prefer sudo halt -p. :D
The pros and cons of each being...?
by mooblie
Wed Sep 19, 2018 11:31 pm
Forum: General discussion
Topic: Shut down rpi with a keyboard key combo
Replies: 9
Views: 236

Re: Shut down rpi with a keyboard key combo

Is this any use: https://www.raspberrypi.org/forums/viewtopic.php?f=29&t=206921#p1280779 It won't physically remove power, but nothing internal to the Pi will do that without extra/external hardware. However it does put the Pi into a state whereby you can just safely "pull the plug". BTW: Note that ...
by mooblie
Wed Sep 19, 2018 6:09 pm
Forum: Networking and servers
Topic: Extending Wifi Signal
Replies: 9
Views: 232

Re: Extending Wifi Signal

You really need to also consider modifying your Pi to put an external wifi antenna socket on it - and then use directional antennas at BOTH ends (router AND Pi). After all, Wifi is two-way!

Understandably, modifying your Pi like this is frowned on here, but well...
by mooblie
Tue Sep 18, 2018 8:27 pm
Forum: Beginners
Topic: Watching a DVD under Raspian Stretch, how?
Replies: 9
Views: 212

Re: Watching a DVD under Raspian Stretch, how?

ghans wrote:
Tue Sep 18, 2018 6:40 pm
The point of Blu-Ray was to introduce copy-protection ................- the system works ?
Not really, in my understanding. I hear that it's easy enough to rip a Blu-ray disc using various methods/platforms. Never done it myself of course. :oops:
by mooblie
Tue Sep 18, 2018 1:38 pm
Forum: Beginners
Topic: Watching a DVD under Raspian Stretch, how?
Replies: 9
Views: 212

Re: Watching a DVD under Raspian Stretch, how?

Confirmed, guys. I just tried it in the flesh and Kodi cannot playback BDs (unless they are ripped elsewhere, on another platform first, and provided as "plain" MP4 media files, but that's cheating!)
by mooblie
Mon Sep 17, 2018 9:40 pm
Forum: General discussion
Topic: How to almost "shutdown" the Pi, only HDMI showing an image, to save battery
Replies: 10
Views: 376

Re: How to almost "shutdown" the Pi, only HDMI showing an image, to save battery

your 'image' which will be shown for 2 hours is all static, right? So why not use an e-Paper display instead of a monitor connected to HDMI? Good point. And many I2C or SPI connected LCD/OLED displays can retain their images while a Pi is powered off as long as the display remains powered. It would...
by mooblie
Mon Sep 17, 2018 9:17 pm
Forum: Beginners
Topic: Watching a DVD under Raspian Stretch, how?
Replies: 9
Views: 212

Re: Watching a DVD under Raspian Stretch, how?

if you installed kodi you might get it to work there. I can confirm this works well. I have (and it is probably required) the MPEG-2 codec installed on my Pi 3B, but then, I installed Kodi as an app. on Raspbian: sudo apt-get install kodi As well as acing as a fine media player from a locally-attac...
by mooblie
Mon Sep 17, 2018 7:15 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: GPIO Output Characteristics
Replies: 7
Views: 175

Re: GPIO Output Characteristics

Thanks for the information, everybody!
by mooblie
Mon Sep 17, 2018 7:12 pm
Forum: General discussion
Topic: DIY POE?
Replies: 21
Views: 528

Re: DIY POE?

Good news, thanks!
by mooblie
Mon Sep 17, 2018 6:35 pm
Forum: General discussion
Topic: DIY POE?
Replies: 21
Views: 528

Re: DIY POE?

Thanks, 6by9. Whilst we're on the subject, may I ask:

Are all Pi 3s' Ethernet ports Auto-MDIX? - i.e. auto polarity sensing and switching? obviating the need to ever use a cross-over RJ45 cable?
by mooblie
Mon Sep 17, 2018 5:41 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: GPIO Output Characteristics
Replies: 7
Views: 175

Re: GPIO Output Characteristics

Maybe Terry was thinking of this situation: I understand that GPIO pins, when acting as outputs, are "fully-driven" both high and low, and NOT open-collector, but I also think I have heard somewhere that SOME GPIO pins have external puii-up resistors fitted on the Pi PCB. Is that true? If so, where ...
by mooblie
Mon Sep 17, 2018 11:56 am
Forum: General discussion
Topic: DIY POE?
Replies: 21
Views: 528

Re: DIY POE?

So have I understood correctly that the Pi 3B+ (with it's quoted "300Mbps" Ethernet bandwidth) uses all four twisted pairs in a Cat5e/6 cable? i.e. the RJ-45 port uses not just the "10-100/Fast" pairs only, but all the "1000/Gigabit" pairs?

6by9 could confirm?
by mooblie
Mon Sep 17, 2018 7:41 am
Forum: General discussion
Topic: DIY POE?
Replies: 21
Views: 528

Re: DIY POE?

For longer distances and higher current draw you have a problem of voltage drop due to cable resistance. Agreed. You could always use a nominal +5V buck DC-DC convertor at the power-sending end with an adjustable output (as jabuzzard suggested). Then adjust the source voltage when feeding the Pi th...
by mooblie
Sun Sep 16, 2018 7:53 pm
Forum: General discussion
Topic: DIY POE?
Replies: 21
Views: 528

Re: DIY POE?

You could always try this pair between your router and Pi:

https://www.ebay.com/itm/173019998936

You will need to source/use a pair of barrel DC power connector adapters, but, hey, you said DIY, and this is the Pi forum!! :) (And it's cheap!)

(Actually, I think this is what pootle's referring to?)
by mooblie
Sun Sep 16, 2018 7:33 pm
Forum: Beginners
Topic: LOSING MY MIND: Read-write to \home\pi over FTP
Replies: 2
Views: 83

Re: LOSING MY MIND: Read-write to \home\pi over FTP

Filezilla is available on the Mac, and the Pi! (and Windows if you must!)

Works perfectly for me.
by mooblie
Sun Sep 16, 2018 7:23 pm
Forum: Troubleshooting
Topic: Can't transfer a file OFF the Pi
Replies: 5
Views: 147

Re: Can't transfer a file OFF the Pi

Presumably you can SSH from your iMac into the Pi?

In that case, the command "scp" works for me to move files between the Mac <> Pi.
by mooblie
Sat Sep 15, 2018 11:11 pm
Forum: Python
Topic: Script to change led color to match available space on sd card
Replies: 8
Views: 192

Re: Script to change led color to match available space on sd card

I stand corrected! Thanks guys! It must be my age showing. :roll:

I must get some of these new fangled multi-coloured LEDs to experiment with.
by mooblie
Sat Sep 15, 2018 6:15 pm
Forum: Python
Topic: Script to change led color to match available space on sd card
Replies: 8
Views: 192

Re: Script to change led color to match available space on sd card

BTW: to the OP: not sure if I've interpreted your requirements correctly, but I don't think you will be able to get a SINGLE LED that can display THREE different colours. I fear only Bi- (two) colour LEDs are available. For simplicity/economy, you may find you have to start your project by using thr...
by mooblie
Sat Sep 15, 2018 5:33 pm
Forum: Troubleshooting
Topic: Wifi issues with 3B+
Replies: 2
Views: 68

Re: Wifi issues with 3B+

Can you open a Terminal window, and type the command:

"iwconfig"

It should show you the Wifi signal strength and quality like this:

"Link Quality=45/70 Signal level=-65 dBm "
by mooblie
Sat Sep 15, 2018 1:04 pm
Forum: Raspbian
Topic: Will people please think about low res displays?
Replies: 45
Views: 1124

Re: Will people please think about low res displays?

I'm not seeing it that small - it fills a 32" Full HD TV screen: http://www.headspin.plus.com/store/forums/2x2_startup.JPG I'm using the "pixel-doubling" setting (as it's on a large TV, operated from the sofa) but that shouldn't cause this, surely? Everything else: desktop, apps, windows, images, et...
by mooblie
Fri Sep 14, 2018 6:41 pm
Forum: Raspbian
Topic: Will people please think about low res displays?
Replies: 45
Views: 1124

Re: Will people please think about low res displays?

jamesh wrote:
Mon Sep 10, 2018 10:44 am
If anyone does find any Raspbian specific windows that exceed the 800x480 please let me know. Obviously we won't be changing Other Peoples Software.
Is the "Edit Bookmark" window on Chromium down to you? It's too tall for many displays, with OK off the bottom.
by mooblie
Fri Sep 14, 2018 5:55 pm
Forum: C/C++
Topic: wiringPiISR switch bounce
Replies: 7
Views: 271

Re: wiringPiISR switch bounce

As long as you use a SPDT switch that breaks one pole before making the other (like "all" SPDT switches do) then ANY such switch will do, and the two NAND gates are guaranteed to de-bounce it absolutely into a clean single edge. https://proxy.duckduckgo.com/iu/?u=https%3A%2F%2Fi.stack.imgur.com%2Fe8...
by mooblie
Fri Sep 14, 2018 5:50 pm
Forum: Raspbian
Topic: Will people please think about low res displays?
Replies: 45
Views: 1124

Re: Will people please think about low res displays?

I see the SSH default password warning box has already been re-shaped on the latest Raspbian.

Is this also why the colour box on pre-bootup has changed to a boring 2x2 box, instead of the pretty shaded rainbow box? :)
by mooblie
Wed Sep 12, 2018 10:57 pm
Forum: C/C++
Topic: wiringPiISR switch bounce
Replies: 7
Views: 271

Re: wiringPiISR switch bounce

IMHO, debouncing is best done in hardware, if you're up for that. Two NAND gates, two pull-ups and a SPDT switch are all that is required. Then no software shenanigans are necessary.

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