Comments for Open hardware http://openhardware.wordpress.com Just another WordPress.com weblog Sun, 25 Jan 2009 09:37:20 +0000 http://wordpress.com/ hourly 1 Comment on Using a multi-core design to acheavie hard real-time by Bernhard http://openhardware.wordpress.com/2008/12/26/using-a-multi-core-design-to-acheavie-hard-real-time/#comment-228 Bernhard Sun, 25 Jan 2009 09:37:20 +0000 http://openhardware.wordpress.com/?p=26#comment-228 Hi Paul Saw your Linuxstamp post on the PTXdist ml. I just wrote a paper about real-time Linux on multi-core systems and the kernel actually provides the facilities to isolate CPUs/cores to run specific tasks. A little extra work is needed though... You might want to have a look at the related how-to I contributed to the RTAI project. <> Hi Paul

Saw your Linuxstamp post on the PTXdist ml. I just wrote a paper about real-time Linux on multi-core systems and the kernel actually provides the facilities to isolate CPUs/cores to run specific tasks. A little extra work is needed though… You might want to have a look at the related how-to I contributed to the RTAI project.

<>

]]> Comment on Power Over Ethernet working by openhardware http://openhardware.wordpress.com/2007/12/08/power-over-ethernet-working/#comment-227 openhardware Sun, 25 Jan 2009 04:58:22 +0000 http://openhardware.wordpress.com/2007/12/08/power-over-ethernet-working/#comment-227 Riley, Actually the default power supply for the Linuxstamp is through the USB device port. The POE is nice, but it requires the external module. thanks, Paul Riley,

Actually the default power supply for the Linuxstamp is through the USB device port. The POE is nice, but it requires the external module.

thanks,
Paul

]]> Comment on Power Over Ethernet working by riley porter http://openhardware.wordpress.com/2007/12/08/power-over-ethernet-working/#comment-226 riley porter Sun, 25 Jan 2009 04:44:05 +0000 http://openhardware.wordpress.com/2007/12/08/power-over-ethernet-working/#comment-226 Hello, Great stuff! I have a question that is a bit off topic though. Is there a way to possibly power the stamp over USB? I mean I would assume you would need to build the chip capable from the start for this type of feature.. That being said is that something that future stamp's could have? Either way Love you stuff I plan on getting one to do some robotic + wifi projects soon! Riley www.synthetos.com Hello, Great stuff! I have a question that is a bit off topic though. Is there a way to possibly power the stamp over USB? I mean I would assume you would need to build the chip capable from the start for this type of feature.. That being said is that something that future stamp’s could have?

Either way Love you stuff I plan on getting one to do some robotic + wifi projects soon!

Riley
http://www.synthetos.com

]]> Comment on Prototype boards by openhardware http://openhardware.wordpress.com/2007/10/03/prototype-boards-2/#comment-225 openhardware Mon, 03 Nov 2008 05:25:26 +0000 http://openhardware.wordpress.com/2007/10/03/prototype-boards-2/#comment-225 You might be able to use a USB adapter or something, but the processor isn't that fast and doesn't have any hardware to deal with graphics. You might be able to use a USB adapter or something, but the processor isn’t that fast and doesn’t have any hardware to deal with graphics.

]]> Comment on Prototype boards by Guri http://openhardware.wordpress.com/2007/10/03/prototype-boards-2/#comment-224 Guri Mon, 03 Nov 2008 05:20:44 +0000 http://openhardware.wordpress.com/2007/10/03/prototype-boards-2/#comment-224 Hello nice board have you thought about addingVGA/VDI out module to board? it would be nice low cost microcomputer option Hello
nice board
have you thought about addingVGA/VDI out module to board?
it would be nice low cost microcomputer option

]]> Comment on Prototype boards by George http://openhardware.wordpress.com/2007/10/03/prototype-boards-2/#comment-217 George Fri, 05 Oct 2007 00:28:23 +0000 http://openhardware.wordpress.com/2007/10/03/prototype-boards-2/#comment-217 I was wondering if the kernel provided drivers for USB audio. I have a project where I would like to take this design and load MP3 files onto the SD card and then connect USB speakers. Do you know if this will work or could I buy one of your prototypes from you to start my own testing? I was wondering if the kernel provided drivers for USB audio. I have a project where I would like to take this design and load MP3 files onto the SD card and then connect USB speakers. Do you know if this will work or could I buy one of your prototypes from you to start my own testing?

]]> Comment on Linuxstamp motherboard by andrea http://openhardware.wordpress.com/2007/05/29/linuxstamp-motherboard/#comment-162 andrea Fri, 07 Sep 2007 11:01:36 +0000 http://openhardware.wordpress.com/2007/05/29/linuxstamp-motherboard/#comment-162 When will it be on sale? (and where) When will it be on sale? (and where)

]]> Comment on Linuxstamp motherboard by Brian http://openhardware.wordpress.com/2007/05/29/linuxstamp-motherboard/#comment-13 Brian Thu, 21 Jun 2007 02:07:49 +0000 http://openhardware.wordpress.com/2007/05/29/linuxstamp-motherboard/#comment-13 I have now read the specs on POE more thoroughly. It looks like adding the detection resistor b/w the two pairs (25kohm) and possibly a 43V zener like the 568-3847-1-ND would allow us to get our 5V to enable the Regulator. This would keep the Regulator in the 5-10uA off state during the detection stage. I have now read the specs on POE more thoroughly. It looks like adding the detection resistor b/w the two pairs (25kohm) and possibly a 43V zener like the 568-3847-1-ND would allow us to get our 5V to enable the Regulator. This would keep the Regulator in the 5-10uA off state during the detection stage.

]]> Comment on Linuxstamp motherboard by openhardware http://openhardware.wordpress.com/2007/05/29/linuxstamp-motherboard/#comment-12 openhardware Sun, 17 Jun 2007 20:45:18 +0000 http://openhardware.wordpress.com/2007/05/29/linuxstamp-motherboard/#comment-12 I think that part would work well for the power supply. The PSE (power sourcing equipment) tries to detect whether a device is POE or standard ethernet. Reading wikipedia it seems like this is done with a resistor. The problem is that the PSE is measuring the current at a specific voltage to read the resistance. I think the current draw of a normal power supply will change this reading. The power supply needs to be open until the PSE fully powers the lines. We could design something to do this or use an off the shelf POE part. I think that part would work well for the power supply.

The PSE (power sourcing equipment) tries to detect whether a device is POE or standard ethernet. Reading wikipedia it seems like this is done with a resistor. The problem is that the PSE is measuring the current at a specific voltage to read the resistance. I think the current draw of a normal power supply will change this reading. The power supply needs to be open until the PSE fully powers the lines. We could design something to do this or use an off the shelf POE part.

]]> Comment on Linuxstamp motherboard by Brian http://openhardware.wordpress.com/2007/05/29/linuxstamp-motherboard/#comment-11 Brian Sun, 17 Jun 2007 12:54:49 +0000 http://openhardware.wordpress.com/2007/05/29/linuxstamp-motherboard/#comment-11 The LM2593HVS-5.0-ND is a 2A reg and has a /shutdown input. What kind of detection/switching are you looking for? If you want it to automatically detect a plug-in supply vs POE, you could have the 48VDC power a small SPDT relay that would let the plug-in supply run it in the NC position, and the POE would be connected to the NO position. The LM2593HVS-5.0-ND is a 2A reg and has a /shutdown input. What kind of detection/switching are you looking for? If you want it to automatically detect a plug-in supply vs POE, you could have the 48VDC power a small SPDT relay that would let the plug-in supply run it in the NC position, and the POE would be connected to the NO position.

]]>