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by Gert van Loo
Wed Aug 17, 2011 7:06 pm
Forum: General discussion
Topic: Profile Pics
Replies: 39
Views: 5915

Re: Profile Pics

My problem is that Gravatar does not accept the name + password I use for the Raspberry Pi forum.
I assumed both used the same 'WordPress.com' database. Seems not, or it is not working.
Until I can log into Gravatar I can't upload a picture.
by Gert van Loo
Wed Aug 17, 2011 3:29 pm
Forum: General discussion
Topic: Alpha boards update
Replies: 9
Views: 1845

Re: Alpha boards update

<t>Hi guys.<br/> Here is some more data from the Alpha boards.<br/> Boot time:<br/> Measured booting into Linux Debian prompt (no GUI): 34 seconds.<br/> (Note that Boot time greatly depends on speed and width of the SD-card interface.)<br/> <br/> Power:<br/> I am using a 7.5V external supply.<br/> D...
by Gert van Loo
Wed Aug 17, 2011 2:52 pm
Forum: General discussion
Topic: Profile Pics
Replies: 39
Views: 5915

Re: Profile Pics

Does not work for me.
I tried very carefully, make sure I made no errors but it does NOT accept my Raspi name + password.
by Gert van Loo
Tue Aug 16, 2011 6:00 pm
Forum: General discussion
Topic: Interfaces, Case, Package (Request/Suggestion)
Replies: 26
Views: 5808

Re: Interfaces, Case, Package (Request/Suggestion)

<r>Quote from Cafe on August 16, 2011, 06:59<br/> Quote from Lob0426 on August 15, 2011, 01:54<br/> Liz: how much more does the SMC 9514 chipset cost?<br/> ....<br/> <br/> Here are the unit prices for different batch sizes at Digikey:<br/> <br/> LAN9512 (2 USB, 1 Ethernet; used on the Raspi):<br/> -...
by Gert van Loo
Mon Aug 15, 2011 2:12 pm
Forum: Automation, sensing and robotics
Topic: Raspberry Pi Controlled Relays (for sprinklers) (Difficulty: Advanced)
Replies: 23
Views: 6258

Re: Raspberry Pi Controlled Relays (for sprinklers) (Difficulty: Advanced)

I know it requires more hardware but I would add an AD converter to check the soil conductivity. Just add water when R is too high. Then you can do without all the timers etc. Of course then you could could also replace the whole RASPI with a pic.
by Gert van Loo
Mon Aug 15, 2011 6:53 am
Forum: General discussion
Topic: Final version
Replies: 7
Views: 1754

Re: Final version

<t>The challenge of the final design is to walk the razor thin edge of cost/performance. This was done somewhat for the alpha boards but for the next ten thousand it is real. So for every component we have to think hard. The power supplies have been show much more expensive than we thought. We think...
by Gert van Loo
Sun Aug 14, 2011 8:58 am
Forum: General discussion
Topic: Developing world - A scenario
Replies: 62
Views: 7795

Re: Developing world - A scenario

<t>I like that scenario because it is exactly the kind of person we are trying to reach.<br/> To stay in the same mindset: he/she has little money but plenty of time. swapping cards, USB sticks plugging unplugging etc. is no issue.<br/> The only solution is that to he/she has a second storage device...
by Gert van Loo
Sat Aug 13, 2011 12:16 pm
Forum: General discussion
Topic: Physical design
Replies: 120
Views: 14224

Re: Physical design

<t>SW1 is the reset switch. I will re-define the DSI/CSI connector now as you look at the main picture: J12 is DSI, (left of HDMI in the picture) J13 is CSI. (right of HDMI in the picture) ARM JTAG is a function of the GPIO pins. GPU JTAG will become a Do-Not-Fit. We expect most ARM debugging to be ...
by Gert van Loo
Sat Aug 13, 2011 8:15 am
Forum: General discussion
Topic: Physical design
Replies: 120
Views: 14224

Re: Physical design

<t>SW2 and SW3 will not be on any of the follow up boards.<br/> Holding it with HDMI to the back the CSI connector is at the left and DSI is at right. J2 is the RS232 with TX, RX, GND and 3V3.<br/> We are still looking into the type and place of the expansion connectors. The plan is to add a few GPI...
by Gert van Loo
Fri Aug 12, 2011 5:30 pm
Forum: General discussion
Topic: Physical design
Replies: 120
Views: 14224

Re: Physical design

I think its very simple. If they can put chocolates in beautiful transparent boxes, it can't be expensive. Again it is a matter of volume. (Come to think of it: there are chocolates out there more expensive that a Raspi).
by Gert van Loo
Fri Aug 12, 2011 3:39 pm
Forum: General discussion
Topic: More photos and videos
Replies: 8
Views: 1932

Re: More photos and videos

Wrong person! It is I who has the power over the alpha boards distribution.
Did hear "bribe"?
by Gert van Loo
Thu Aug 11, 2011 5:41 pm
Forum: Other projects
Topic: Router with integrated Raspberry Pi.
Replies: 45
Views: 11785

Re: Router with integrated Raspberry Pi.

<t>I would like to find a way to have more direct control of the router by the RasPi. Would this be possible through a serial interface?<br/> <br/> Yes, we have a serial port. As you are talking short distance you do not need RS323 conversion chips. 1-to-1 should work. You can also use SPI or I2C we...
by Gert van Loo
Thu Aug 11, 2011 5:29 pm
Forum: General discussion
Topic: Storage
Replies: 15
Views: 3258

Re: Storage

<t>Yes, we will offer boot-ready SD-cards. The image(s) will also be available for downloading though we might have to point to a more powerful download site. We will offer power bricks, tested HUBS, keyboards and mice. (Power bricks for some countries may take a while as there we get into safety le...
by Gert van Loo
Wed Aug 10, 2011 7:30 pm
Forum: General discussion
Topic: Memory expandability?
Replies: 32
Views: 5079

Re: Memory expandability?

No, the DRAM interface is no longer accessible after you put a PoP on it.
by Gert van Loo
Wed Aug 10, 2011 2:38 pm
Forum: Other projects
Topic: Demonstration of computer network use
Replies: 13
Views: 4566

Re: Demonstration of computer network use

The 'F' is the floating point part which you can add or not. We did add it.
by Gert van Loo
Wed Aug 10, 2011 1:43 pm
Forum: Other projects
Topic: Demonstration of computer network use
Replies: 13
Views: 4566

Re: Demonstration of computer network use

Device is an ARM1176JZFS where the J is for Jazelle which according to WIKI is:
"Jazelle DBX (Direct Bytecode eXecution) allows some ARM processors to execute Java bytecode in hardware as a third execution state alongside the existing ."
by Gert van Loo
Wed Aug 10, 2011 8:20 am
Forum: General discussion
Topic: Power supply
Replies: 93
Views: 13773

Re: Power supply

<t>You can not power it from HDMI. I have seen that wrong statement several times now.<br/> The HDMI standard says you can draw max 50mA from the HDMI connector. See HDMI spec section 4.2.7. That is not enough to run the board from. USB is max 500mA, so that is doable but a lot of USB ports can not ...
by Gert van Loo
Tue Aug 09, 2011 3:35 pm
Forum: General discussion
Topic: How will this differ from the OLPC project?
Replies: 18
Views: 4707

Re: How will this differ from the OLPC project?

<t>The part which worries me somewhat is the investment required. To keep the price down you have to think of batches of 10K. That requires an op-front investment of $250.000 and with a lot of people asking for B's you get to $300.000. You are probably safe for the first batch as there seems to be e...
by Gert van Loo
Tue Aug 09, 2011 11:58 am
Forum: General discussion
Topic: Analogue audio quality?
Replies: 11
Views: 2279

Re: Analogue audio quality?

<t>Definitely without connector. So you can decide on your own provided you have the right pitch. We are not yet sure about holes or SMD. Alpha board has holes so you can mount male or female, top or bottom. But holes cost a bit more then SMD due to drill cost.This is one of the feature we have to d...
by Gert van Loo
Tue Aug 09, 2011 11:45 am
Forum: General discussion
Topic: overclocking
Replies: 92
Views: 16886

Re: overclocking

<r>As real engineers, yes, we have overclocked the ARM. But we can't tell you about it as this is an open website and one of our marketing managers might read it. They will immediately sell it with that spec. <E>;)</E> Yes, we have overclocked the SDRAM but we raised the operating voltage beyond the...
by Gert van Loo
Mon Aug 08, 2011 6:13 pm
Forum: Off topic discussion
Topic: wow we must be really bad :)
Replies: 20
Views: 3713

Re: wow we must be really bad :)

<t>And I mostly hardware oriented. (Although I have a degree in SW engineering) But my hands are tied very much about what can tell you about that. Even then, a lot of hardware features are only usable if the GPU driver supports them and for that I have to see what the driver developer has implement...
by Gert van Loo
Fri Aug 05, 2011 12:41 pm
Forum: General discussion
Topic: Physical design
Replies: 120
Views: 14224

Re: Physical design

I big board is more stable and allows easier access for expansion and makes the connector not so close together and is easier to route and removes heat better and .... costs more.
by Gert van Loo
Wed Aug 03, 2011 9:35 pm
Forum: General discussion
Topic: Power supply
Replies: 93
Views: 13773

Re: Power supply

<t>The issue with the power supplies is that they will be changing from the current one. On the Alpha board I plonked down what was in our parts library. There was no time to look at cost. Therefore I can't promise anything until that is sorted out. Most cheap ones are buck converters which require ...
by Gert van Loo
Tue Aug 02, 2011 5:07 pm
Forum: Staffroom, classroom and projects
Topic: Fond memories
Replies: 42
Views: 9551

Re: Fond memories

<t>Ok, I'll give in and at the same time expose my age.<br/> First computer experience was a room full of teletypes punching characters on a roll of paper.<br/> Best thing of them was you could keep up with it, reading when they where writing.<br/> I don't know what the computer was but I went throu...
by Gert van Loo
Tue Aug 02, 2011 8:30 am
Forum: General discussion
Topic: DC Power
Replies: 8
Views: 4341

Re: DC Power

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