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by reggie
Thu Jul 05, 2012 12:03 pm
Forum: Other projects
Topic: Simple LED screen signaling
Replies: 9
Views: 2121

Re: Simple LED screen signaling

You're welcome. I couldn't seem to find out which controller your particular LCD screen uses but it looks like it's a fairly regular one, so you should be ok with it as the principal of operation will be very similar.
by reggie
Thu Jul 05, 2012 2:06 am
Forum: Other projects
Topic: Simple LED screen signaling
Replies: 9
Views: 2121

Re: Simple LED screen signaling

http://www.electronics-lab.com/projects/mcu/015/index.html These 8bit parallel screens are pretty much everywhere, look on sparkfun, adafruit etc. you'll probably find code examples, schematics etc. Arduino have some fairly mature libraries these days that can show you how to use the least amount of...
by reggie
Thu Jul 05, 2012 1:24 am
Forum: Troubleshooting
Topic: Distorted Sound with USB sound card
Replies: 11
Views: 5991

Re: Distorted Sound with USB sound card

I think you've really had your answers already, high load on the usb = dropouts or distortion, that includes across the network, so to reduce distortion, reduce the load on the network/usb. 480Mbits total less overheads.
by reggie
Thu Jun 28, 2012 11:39 am
Forum: Media centres
Topic: Kobo Deluxe
Replies: 0
Views: 2291

Kobo Deluxe

I thought I'd take a look at kobo deluxe as it's great and free, it's available in the repositories and it does install but it still needs a little fixup to make it work properly. The project homepage is here: http://olofson.net/kobodl/ To install directly from a pi, open a terminal and do: sudo apt...
by reggie
Thu Jun 28, 2012 10:49 am
Forum: Other projects
Topic: usb input pad
Replies: 5
Views: 1020

Re: usb input pad

What I was saying was that you don't need an input board for the pi, you can interface directly to the gpio-pins. but as you want something to move between computers, it's probably not what you're looking for. The next nearest thing I could suggest would be an arduino using the ps2 library (attach a...
by reggie
Tue Jun 26, 2012 3:50 am
Forum: Other projects
Topic: usb input pad
Replies: 5
Views: 1020

Re: usb input pad

you might not need a great deal else, http://www.raspberrypi.org/phpBB3/viewtopic.php?f=50&t=8842 Keyboard_matrix.c I believe has the code in, and I think there is a text file in the kernel sources documentation folder that should help, you can basically use 8 gpios to make your keypad :) Failing th...
by reggie
Tue Jun 26, 2012 3:47 am
Forum: Other projects
Topic: Automatic power on/off
Replies: 51
Views: 24826

Re: Automatic power on/off

micrel do some ldos that have a pin to turn the power on/off. http://uk.rs-online.com/web/p/linear-regulator/0453609/ page 15 of the datasheet http://docs-europe.electrocomponents.com/webdocs/0adb/0900766b80adbbbe.pdf mentions the enable pin, it's ttl, so with a little bit of level conversion it sho...
by reggie
Mon Jun 25, 2012 10:08 pm
Forum: Other projects
Topic: Automatic power on/off
Replies: 51
Views: 24826

Re: Automatic power on/off

currently, as of the wheezy release, the raspberry pi doesn't seem to actually shut down at all, I read about 1/2 of the first page and skimmed the rest, so not sure if someone already mentioned it. When I tell teh pi to shutdown, it goes through the motions and tells me the system has halted. It le...
by reggie
Mon Jun 25, 2012 7:50 pm
Forum: Other projects
Topic: Mixxx port
Replies: 12
Views: 5458

Re: Mixxx port

I would wonder if djing with 2 pis wouldn't be a suitable scenario if a single pi couldn't cope with a soundcard, the pi can playback mp3s very easily, so 2 pi's going into a physical analogue mixer perhaps would also be an option? Not an ideal scenario if you wanted to keep everything in the digita...
by reggie
Mon Jun 25, 2012 7:40 pm
Forum: Automation, sensing and robotics
Topic: Stepper Motor Project
Replies: 15
Views: 9302

Re: Stepper Motor Project

In general, people will put some kind of micro controller between a linux box and their stepper motor controller, this makes it easy to issue some commands to the micro controller via serial, ethernet etc. which is running a realtime system or close enough so that it can do the business of moving th...
by reggie
Mon Jun 25, 2012 7:27 pm
Forum: Automation, sensing and robotics
Topic: Panalyzer - a RaspberryPi based Logic Analyzer
Replies: 69
Views: 60763

Re: Panalyzer - a RaspberryPi based Logic Analyzer

Fantastic work on the panalyzer code, I'm wondering if there is a pressing need to actually use linux as the interface to the gpio pins here, or whether you'd get more speed out of it accessing everything before linux gets it's grubby fingers all over the place. Something like uboot does (believe so...
by reggie
Mon Jun 25, 2012 3:27 am
Forum: Advanced users
Topic: Powering with a Hub
Replies: 6
Views: 5823

Re: Powering with a Hub

those 7 port hubs are a bit junky, missing caps, no seperation between vUsb and 5v in, roulette as to whether you're going to get a good or bad power supply.
by reggie
Mon Jun 25, 2012 3:25 am
Forum: Advanced users
Topic: Running with Power port unplugged
Replies: 68
Views: 18029

Re: Running with Power port unplugged

you might also want to add in the resistance of the microUsb cable in use too, as that's not trivial in some cases, on one of mine is causing a 250mv voltage drop :( Plugging in just my USB hub also causes a voltage drop of 250mv, it's not backpowering though.
by reggie
Sun Jun 24, 2012 11:22 am
Forum: Troubleshooting
Topic: RPi breaks SD-Cards
Replies: 14
Views: 3754

Re: RPi breaks SD-Cards

I still want to know what his definition of 'breaks sd cards' is. The educational release will be coming with a case won't it? So no need to toughen anything up, especially if you educate the younguns before you let them loose on a pi.
by reggie
Sun Jun 24, 2012 10:53 am
Forum: General discussion
Topic: SD Card performance in R-Pi onboard slot
Replies: 289
Views: 162052

Re: SD Card performance in R-Pi onboard slot

Would be useful if you could paste the error messages you are getting. It's difficult for anyone to debug stuff with such a small amount of information.
by reggie
Sat Jun 23, 2012 3:14 pm
Forum: Troubleshooting
Topic: RPi breaks SD-Cards
Replies: 14
Views: 3754

Re: RPi breaks SD-Cards

I'd like to see more about what he's talking about and define what 'ruins sd cards on the fly and breaks them' actually means?
by reggie
Sat Jun 23, 2012 2:11 am
Forum: Troubleshooting
Topic: 8000 interrupts per second when idle!
Replies: 141
Views: 56159

Re: 8000 interrupts per second when idle!

I'm probably in danger of sounding "blasphemous", but what about a hack that would allow the connection and use of a serial mouse and a PS/2 keyboard? Mouse on the UART port, and keyboard on a "bitbanged" GPIO port (with interrupts for "key events"). LOL. :mrgreen: Would probably piss off the Risc ...
by reggie
Sat Jun 23, 2012 2:09 am
Forum: Troubleshooting
Topic: STICKY: Using the Troubleshooting Forum
Replies: 29
Views: 68263

Re: READ ME : Using the Troubleshooting Forum

Pastebin is a website where you can paste long bits of text (code, kernel logs, any random text you like), once you've saved it, you will get a link, you can then post that link in your forum post. copy the text that you want to put in your post, go to www.pastebin.com, paste the text into the big w...
by reggie
Fri Jun 22, 2012 12:39 am
Forum: General discussion
Topic: Wheezy .resizing an SD card .. how long?.
Replies: 9
Views: 1944

Re: Wheezy .resizing an SD card .. how long?.

Resizing the card shouldn't take any amount of little writes at all, you're not moving data, just changing the dimensions of the disk in the file allocation table. If you do it on the pi it might take it's time but it really isn't moving anything so no real writes to perform, unless I'm mistaken. ht...
by reggie
Wed Jun 20, 2012 5:19 pm
Forum: Advanced users
Topic: Running with Power port unplugged
Replies: 68
Views: 18029

Re: Running with Power port unplugged

@jphphotography, I'm pretty sure I've posted some images on the forums somewhere that show the internals of one of the pluscom 7 port hubs knocking around ebay and amazon. Not only are there missing diodes (they're supposed to be where the 0 ohm resistors are) but there are also 7 missing caps too, ...
by reggie
Wed Jun 20, 2012 3:15 am
Forum: General discussion
Topic: Mouse and keyboard over GPIO?
Replies: 24
Views: 12622

Re: Mouse and keyboard over GPIO?

Actually, gpio input is used all over embedded devices, its a very simple and easy way to build a simple interface for a gui in a handheld console for example. Very easy and cheap to implement dpad style up/down/left/right and a handful of buttons :) With that in mind, I've written a simple driver t...
by reggie
Wed Jun 20, 2012 3:04 am
Forum: Debian
Topic: gpio-keys and gpio-mouse driver source code
Replies: 7
Views: 25448

gpio-keys and gpio-mouse driver source code

Hi all, I've been working on a couple of drivers with embedded people in mind. It's a simple proof of concept for a gpio-keys-polled driver and gpio-mouse based driver. It currently implements four gpio pins as 4 keyboard keys and 7 gpio pins as a 3 button mouse. The keypad driver works just fine, t...
by reggie
Mon Jun 18, 2012 3:06 am
Forum: General discussion
Topic: Mouse and keyboard over GPIO?
Replies: 24
Views: 12622

Re: Mouse and keyboard over GPIO?

Just thought I'd point out that not only is there gpio-keys there is also a gpio-mouse driver (which doubles as a joystick driver) in the kernel, so you could use the arduino ps2 library and an atmega328 chip (£3-4 each) you could then quite easily use a normal ps2 mouse and use the output from the ...
by reggie
Thu Jun 14, 2012 2:27 am
Forum: General discussion
Topic: SD Card performance in R-Pi onboard slot
Replies: 289
Views: 162052

Re: SD Card performance in R-Pi onboard slot

lb, thanks for clearing up the tran_speed value in the CSD register, it was highly confusing seeing every card return 32, because we were always reading stale data! Is the tran_speed bit essentially useless to us for guessing what the max clock speed of the card is? I'll look into cmd6, I assumed th...
by reggie
Wed Jun 13, 2012 1:39 am
Forum: General discussion
Topic: SD Card performance in R-Pi onboard slot
Replies: 289
Views: 162052

Re: SD Card performance in R-Pi onboard slot

Might be useful to pull more information off the cards, so we can see what type of cards are being used. Of course I appreciate that they might say class 6, uhs, 150x etc. What information would be useful for the driver writers to debug efficiently? What tests could everyone do to check their cards ...

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