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by PiGraham
Fri Jul 19, 2013 7:13 am
Forum: Other projects
Topic: How to wifi communicate between RPis
Replies: 18
Views: 26872

Re: How to wifi communicate between RPis

What are the ip addresses of your two Pis?
ifconfig
by PiGraham
Fri Jul 19, 2013 6:36 am
Forum: Camera board
Topic: trouble plugging camera ribbon cable into CSI port
Replies: 3
Views: 1424

Re: trouble plugging camera ribbon cable into CSI port

https://www.youtube.com/watch?v=quGJ6VU ... ata_player

Don't force it. There is a latch that lifts to open the connector and presses down to grip the ribbon.
by PiGraham
Thu Jul 18, 2013 6:47 pm
Forum: Graphics, sound and multimedia
Topic: Raspberry PI into car stereo
Replies: 4
Views: 2711

Re: Raspberry PI into car stereo

If you have no reversing camera you can use either back sight video or aux video in. Try one then the other and use the one that works.
It looks like back car control switches between those inputs, so if you have two video sources use that to switch.
by PiGraham
Thu Jul 18, 2013 3:11 pm
Forum: Other projects
Topic: High speed data acquisition AND real time processing
Replies: 14
Views: 10420

Re: High speed data acquisition AND real time processing

TFTFB seems to manage to write image data at 3.5MB/s over SPI to an LCD.

320*240 pixel LCD 16 bit colour runs 23 fps while doing software decode of h264 video file (mplayer) from SD card.

I think the clock runs at 32 MHz for that.

25KHz should be no problem.
by PiGraham
Thu Jul 18, 2013 10:03 am
Forum: Raspberry Pi OS
Topic: X11 forwarding and XBMC
Replies: 16
Views: 9644

Re: X11 forwarding and XBMC

I've used XBMC remote with an XBMC running on an Android TV stick and it allows me me to browse the library, see what's now playing, and play something from the library. It plays on the TV Stick.

Have you enabled HTTP remote control in XBMC system settings?

Can you access the web interface to XBMC?
by PiGraham
Thu Jul 18, 2013 9:59 am
Forum: General discussion
Topic: Control strobe light
Replies: 1
Views: 1655

Re: Control strobe light

It could be done.
You would need a USB soundcard to get the audio in.
For simplicity a PiFace will give you two relays to switch your two devices.
You may get some good leads on software audio analysis here :
http://stackoverflow.com/questions/6570 ... rogramming
by PiGraham
Thu Jul 18, 2013 9:51 am
Forum: Camera board
Topic: Multiple cameras on a single raspberry pi board
Replies: 69
Views: 173095

Re: Multiple cameras on a single raspberry pi board

What we know so far is that this is still image capture to jpg up to 12 cameras. It has been pointed out more than once that multiple simultaneous cameras are not possible with a single Pi, and paddi2013 has not indicated that single camera at a time is a problem in this application. thank you for r...
by PiGraham
Thu Jul 18, 2013 8:22 am
Forum: Camera board
Topic: Multiple cameras on a single raspberry pi board
Replies: 69
Views: 173095

Re: Multiple cameras on a single raspberry pi board

i am looking to use around 6 to 12 cameras with the raspberry pi, do u guys know what is the best way to do it ? and also by minimizing the cost ? Please and thankyou Option 1: Model A + PiCam + WiFi dongle = N x (£20 + £16 + £10) WiFi router / AP = £25 12 cameras = £577 Option 2: Model B + N x USB...
by PiGraham
Wed Jul 17, 2013 8:35 pm
Forum: General discussion
Topic: R-Pi Screen Problem
Replies: 11
Views: 5846

Re: R-Pi Screen Problem

Your TV probably has options in the menu for how it displays SD 4:3 on HD widescreen.

Pi composite is only SD. By default NTSC 4:3
by PiGraham
Wed Jul 17, 2013 7:54 pm
Forum: General discussion
Topic: R-Pi Screen Problem
Replies: 11
Views: 5846

Re: R-Pi Screen Problem

You are using the composite video output? Sorry, I haven't done much with X on composite. I did adjust overscan in XBMC and got that fitted fullscreen, but that doesn;t help you. Other config options are listed here http://elinux.org/RPi_config.txt#Video_mode_options What type of TV is it? PAL, NTSC...
by PiGraham
Wed Jul 17, 2013 6:06 pm
Forum: General discussion
Topic: R-Pi Screen Problem
Replies: 11
Views: 5846

Re: R-Pi Screen Problem

by PiGraham
Wed Jul 17, 2013 3:42 pm
Forum: C/C++
Topic: square wave C
Replies: 7
Views: 1750

Re: square wave C

This project generating 100MHz FM PCM /PWM hardware might give you some clues for much lower frequency.
webcache.googleusercontent.com/search?q=cache:2sSuOAJQhN4J:www.icrobotics.co.uk/wiki/index.php/Tur ... clnk&gl=us
by PiGraham
Wed Jul 17, 2013 2:41 pm
Forum: General discussion
Topic: LibreOffice 4
Replies: 4
Views: 2387

Re: LibreOffice 4

Libre Office 4.0.3-2 armhf for wheezy-backports is on the website. Is the real question whether a download of a debian armhf.deb will run of a Pi running Raspbian?

http://packages.debian.org/wheezy-backp ... e/download
by PiGraham
Wed Jul 17, 2013 12:37 pm
Forum: Raspberry Pi OS
Topic: X11 forwarding and XBMC
Replies: 16
Views: 9644

Re: X11 forwarding and XBMC

Use one of many XBMC remote control apps, for all platforms. I use XBMC Remote
Use UPnP I use BubbleUPnP
XBMC can be configured to run a UPnP server, see system settings
You can enable HTTP remote control.
by PiGraham
Wed Jul 17, 2013 12:00 pm
Forum: Camera board
Topic: Multiple cameras on a single raspberry pi board
Replies: 69
Views: 173095

Re: Multiple cameras on a single raspberry pi board

gsh wrote:No CSI is not digital... it's a low voltage differential signal.

Lane frequency is as high as 1Gbit

Gordon
I see what you mean. We would need a lvds PHY in and out.

There are chips for that. http://www.ti.com/product/sn65lvds125

HDMI switching chips like AD8190 might do the job.
by PiGraham
Wed Jul 17, 2013 10:43 am
Forum: C/C++
Topic: pThreads and globals var's
Replies: 9
Views: 1584

Re: pThreads and globals var's

I always thougth that getchar() would remove the newline character and return only a signal char? I will look at throwing it away in the loop. the thing was the input was in a thread so my main program was only ever seeing the newline unless if it was lucky to read the input var between the first g...
by PiGraham
Wed Jul 17, 2013 9:42 am
Forum: Camera board
Topic: Multiple cameras on a single raspberry pi board
Replies: 69
Views: 173095

Re: Multiple cameras on a single raspberry pi board

If you had an analogue multiplex between the N camera's then this would be possible. On my desk I often hot plug the camera's for testing and just run raspivid. (I do not encourage this though, the CSI connector is not developed to work like this and if you had a discharge through the connector you...
by PiGraham
Wed Jul 17, 2013 9:32 am
Forum: Camera board
Topic: Multiple cameras on a single raspberry pi board
Replies: 69
Views: 173095

Re: Multiple cameras on a single raspberry pi board

I seriously doubt it could handle switching between multiplexed camera in any rational and useful way. Preview would be impossible at any sane fps for example. I was certainly not suggesting multiplexing a frame rate. I'm not that crazy! ;) I was only thinking that the init, acg, capture, shutdown ...
by PiGraham
Wed Jul 17, 2013 9:17 am
Forum: Camera board
Topic: Multiple cameras on a single raspberry pi board
Replies: 69
Views: 173095

Re: Multiple cameras on a single raspberry pi board

The underlying software/HW driving the camera would have a hissy fit, not knowing what on earth was going on. OK. Is there some key initialisation at boot? Presumably raspistill doesn't init the camera / IF from scratch, it assumes a known state that a mux would prevent. Is that it? Could a kernel ...
by PiGraham
Wed Jul 17, 2013 8:57 am
Forum: Camera board
Topic: Multiple cameras on a single raspberry pi board
Replies: 69
Views: 173095

Re: Multiple cameras on a single raspberry pi board

I don't think option B is actually possible. Quite possibly so, but could you give some clues as to why not? At the most basic, can't the entire interface be multiplexed with tri-state bus drivers to slow-switch from one camera to another? Allowing something like this: selectcamera 1 rapistill -o i...
by PiGraham
Wed Jul 17, 2013 8:15 am
Forum: C/C++
Topic: pThreads and globals var's
Replies: 9
Views: 1584

Re: pThreads and globals var's

What do you want it to do?
You could easily ignore the \n.

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