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by redhawk
Tue Sep 09, 2014 11:07 am
Forum: Troubleshooting
Topic: Symptom: Green blocks when playing tv live stream
Replies: 9
Views: 2185

Re: Symptom: Green blocks when playing tv live stream

Are the green blocks always located at the bottom of the screen or do they randomly appear elsewhere??

Do you know what resolution the mpeg-2 stream is using ??

Richard S.
by redhawk
Mon Sep 08, 2014 12:31 pm
Forum: Troubleshooting
Topic: My 3V relay doesn't work on GPIO but works on 5V pin with re
Replies: 1
Views: 772

Re: My 3V relay doesn't work on GPIO but works on 5V pin wit

The GIPO output pin proves 3.3v but with limited current so it cannot drive the relay directly you'll need a driver circuit with it's own power supply - https://www.google.co.uk/?q=relay+driver+circuit

Richard S.
by redhawk
Mon Sep 08, 2014 8:35 am
Forum: Beginners
Topic: 192khz audio stream over WiFi
Replies: 6
Views: 1708

Re: 192khz audio stream over WiFi

It must be 192khz because I'm planning on using this to transmit audio to my FM radio station and FM requires that for stereo to work. If you have a dedicated FM transmitter then it shouldn't need a 192kHz audio bandwidth it should broadcast in stereo with a stereo audio input feed. Are you plannin...
by redhawk
Sun Sep 07, 2014 6:20 pm
Forum: Troubleshooting
Topic: Video Can't Be Played
Replies: 15
Views: 3128

Re: Video Can't Be Played

The video posted on the Raspberry Pi website (frame) has the following URL http://player.vimeo.com/video/90103691?title=0&byline=0&portrait=0&color=cccccc From what I can tell Vimeo delivers content based on the browser's user agent string so for i.e. Firefox you're given the inferior SWF powered ru...
by redhawk
Sat Sep 06, 2014 4:16 pm
Forum: Linux Kernel
Topic: Linux for B vs B+
Replies: 5
Views: 2517

Re: Linux for B vs B+

However the USB and LAN ports are not working. From what I can determine from the forums and google the B+ uses a LAN9154 device for USB/LAN, rather than the LAN9152 in the B. If thats right I guess that might be the problem. Not strictly true some B board did come with LAN9154 chips although not a...
by redhawk
Sat Sep 06, 2014 4:04 pm
Forum: Other projects
Topic: Raspberry pi powered radio communications
Replies: 17
Views: 9304

Re: Raspberry pi powered radio communications

If you want to go the FM band route the perhaps FMBerry would suit your needs https://github.com/Manawyrm/FMBerry the old MMR-70 dongles are well cheap on Amazon / eBay. The transmitter has a super stable frequency range of 76MHz to 113.5MHz but limited to 108MHz with the supplied software. It also ...
by redhawk
Sat Sep 06, 2014 3:11 pm
Forum: Beginners
Topic: GPIO pin not enough voltage
Replies: 18
Views: 1832

Re: GPIO pin not enough voltage

As a guess your ground connection isn't ground but 5v, so what you're reading is actually 5 - 3.3 = 1.7v

Richard S.
by redhawk
Sat Sep 06, 2014 2:56 pm
Forum: Troubleshooting
Topic: Video Can't Be Played
Replies: 15
Views: 3128

Re: Video Can't Be Played

What browser, what URL are you using??

Richard S.
by redhawk
Sat Sep 06, 2014 11:53 am
Forum: Beginners
Topic: Pi's refusing to boot
Replies: 2
Views: 486

Re: Pi's refusing to boot

If the lights are flashing then the Pi is booting it's the display you're having problems with.

What display are you using i.e. HDMI or Composite??

Is your Pi configured to force HDMI or to fall back into Composite mode??

Richard S.
by redhawk
Sat Sep 06, 2014 10:33 am
Forum: General discussion
Topic: Obama has a Pi!
Replies: 2
Views: 853

Re: Obama has a Pi!

It's great to see the VIP's at the NATO summit have all been given a Pi as part of their Welsh Goodie packs - wonder how many actually make it out of the box, & how many actually get to see an SD card & power? That's good news, now the President of the United States has something decent to power hi...
by redhawk
Fri Sep 05, 2014 11:53 pm
Forum: Other projects
Topic: Rpi Tape Backup (back up the pi onto a tape)
Replies: 4
Views: 1531

Re: Rpi Tape Backup (back up the pi onto a tape)

It's definitely possible but you may find this more trouble than it's worth. :) Many years ago I wrote and published software for transferring data using a Commodore Datassette hooked up to a PC so I should be able to shed some light on the subject. To start with the Datassette requires a regulated ...
by redhawk
Thu Sep 04, 2014 9:47 pm
Forum: Beginners
Topic: Editing config.txt
Replies: 2
Views: 688

Re: Editing config.txt

The fat partition is for NOOBS so editing config.txt file would not be possible via Windows. For this you must enter NOOBS recovery mode by holding the left shift key after powering on the Pi. After NOOBS loads select the OS and you should have a menu option for edit configuration (or with similar l...
by redhawk
Thu Sep 04, 2014 9:33 pm
Forum: General discussion
Topic: Pis in a public library
Replies: 3
Views: 744

Re: Pis in a public library

Is there a reason why a public library would choose a Pi over a conventional PC??

Richard S.
by redhawk
Thu Sep 04, 2014 7:16 pm
Forum: General discussion
Topic: New B+ but no boot
Replies: 6
Views: 951

Re: New B+ but no boot

What card are you using i.e. brand, class and capacity??

Richard S.
by redhawk
Thu Sep 04, 2014 7:12 pm
Forum: Python
Topic: when to use ' and "
Replies: 4
Views: 628

Re: when to use ' and "

Or: textstring = "The man said \x22Hello\x22 - you\x27re having a laugh right?" :D

Richard S.
by redhawk
Thu Sep 04, 2014 3:23 pm
Forum: Beginners
Topic: Wireless video transmission
Replies: 2
Views: 573

Re: Wireless video transmission

by redhawk
Wed Sep 03, 2014 11:50 pm
Forum: Camera board
Topic: Camera - Removable from board?
Replies: 8
Views: 1874

Re: Camera - Removable from board?

Has anyone bought one of them Adafruit "Spy Camera" (that's still quite large and not very hideable)??

Are they good as the official Pi Camera or on par with the Chinese knock-offs??

Richard S.
by redhawk
Wed Sep 03, 2014 11:39 pm
Forum: Advanced users
Topic: RPI RTL-SDR server: Segmentation fault.
Replies: 50
Views: 22588

Re: RPI RTL-SDR server: Segmentation fault.

rtl_tcp has never ran partially great on the PI for as long as I can remember however rtl_fm on the other hand has always worked without fail. In my case running rtl_tcp seems to only work with the first connection if I stop and start SDRSharp then it crashes. Sometimes on rare occasions rtl_tcp app...
by redhawk
Wed Sep 03, 2014 12:58 pm
Forum: Android
Topic: android on the pi
Replies: 31
Views: 10051

Re: android on the pi

You're wasting your time Android on the Pi won't happen because Broadcom are not providing the required files to cook a ROM and with good reason (the hardware sucks for Android). If you seriously want Android then buy a Box TV or HDMI stick with dual or quad core ARMv7 processor there are plenty of ...
by redhawk
Wed Sep 03, 2014 12:29 pm
Forum: Automation, sensing and robotics
Topic: USB DAC activity monitoring
Replies: 5
Views: 1090

Re: USB DAC activity monitoring

Activating and deactivating an audio amplifier can be achieved with a basic electronic circuit (audio level detection IC i.e. LM3915, one-shot timer circuit based on the NE555 and relay switch). As for the Pi you could toggle the GPIO output pin to control a relay switch and thus control the amplifi...
by redhawk
Tue Sep 02, 2014 8:06 pm
Forum: Other projects
Topic: Raspberry pi powered radio communications
Replies: 17
Views: 9304

Re: Raspberry pi powered radio communications

Some radio transceivers use an audio scrambling method called voice inversion this basically make high frequencies low and low frequency high within a certain frequency range. When listening to such broadcasts with only a simple radio the speech would be audible but difficult if not impossible to un...
by redhawk
Tue Sep 02, 2014 6:27 pm
Forum: General discussion
Topic: would 3.7V kill the GPIO or is it tolerable?
Replies: 29
Views: 2813

Re: would 3.7V kill the GPIO or is it tolerable?

You could probably cheat and use the forward voltage drop of a suitable diode to reduce the voltage going into the GPIO.

Richard S.
by redhawk
Tue Sep 02, 2014 5:06 pm
Forum: C/C++
Topic: Reasons not to compile with -Ofast?
Replies: 5
Views: 1429

Re: Reasons not to compile with -Ofast?

PeterO wrote:I've been getting about x2 speed up when using -O2.

PeterO
-O2 -falign-functions=16 -falign-loops=16 works quite well for me too. :)

Richard S.
by redhawk
Mon Sep 01, 2014 11:55 pm
Forum: Beginners
Topic: My first RPI project
Replies: 28
Views: 2892

Re: My firrst RPI project

I was considering using a Raspberry Pi due to its processing capabilities. I hate to break the news but the Pi does not possess great processing capabilities the CPU is a really old ARMv6 and only suitable for minor tasks. The real power in the Pi is the VideoCore 4 GPU for handling h.264 video dec...
by redhawk
Mon Sep 01, 2014 10:48 pm
Forum: General discussion
Topic: New web browser - it's here!
Replies: 129
Views: 30299

Re: New web browser - it's here!

I am still adrift as to how to enable HTML5 support. There doesn't seem to be anything to click on that page (http://www.youtube.com/html5) to "enable" it. And, shouldn't it be enabled by default (as one poster here implies) ? With Firefox I need to enable html5 playback using that URL but as anoth...

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