Raspberry Pi Forums

michele.x

The company where I'm employed contracts out component sourcing and manufacturing for surface mount boards, extremely similar to what's done to build a Pi but rather our products are for controlling automotive EFI systems. I'm aware of the processes involved to bring a board to market which is why ...

michele.x

Not sure why you think it is that hard to get the Raspberry Pi at the advertised prices? They have been easily available via Farnell/Element 14/Newark since about July (with at worst a few weeks lead time) and I have got a number for myself via that route. In ebay happens sometimes that goods are s...

michele.x

If someone could figure out a way to make a cheap USB-to-USB network (I wouldn't be surprised it said already exists), or use a USB-to-Ethernet adapter...the Model A would be pretty good for building bramples for experimenting with or teaching about parallel systems. If you're making a large enough...

michele.x

Really nice program! Anyway I made a small patch that make three useful things: - mplayer is called with fbdev2 output mode, that seems to work sufficentrly on the pi - the video quality is fixed, intead of the max quality --- it's a kludge, but work for me an my slow dsl. - whe a video is played th...

michele.x

RS components, like Farnell and DIGI-KEY and such, cater for professionals, those people on this planet that are constantly building prototypes. So if you are a customer there its normal to order large numbers of random parts in small quantities. They are specialised in handling that. They're deali...

michele.x

I've had an ideat, that's almost crazy. It's possible to modify the GPU firmware to output on the composite port a a 576p or a 480p signal? Using a sync separator circuit, made using an LM1881 or an EL1883, the vertical and horizontal sync could be extracted and fed to the correct pins to the vga co...

michele.x

Scenario: Raspberry model B powered by 1A usb. Hard drive: 2TB WD20Ears 3.5'' so I use this adaptor from sata to usb: http://dx.com/p/usb-2-0-to-sata-ide-5-component-cable-black-10113?item=8 so it's self powered. I've seen the description and the photos. Did you use the power supply in the photo to...

michele.x

I'm not sure if the host can query the sdtv aspect ratio from the firmware using TV service. (the fbset values could be used to guess, but they may have been changed). vcgencmd get_config reports the sdtv_mode and sdtv_aspect correctly, so it's possible to know for an userspace application the scrr...

michele.x

Same issue, The sdtv_aspect setting looks like a placebo, everyone seems to ignore-it. NTSC - "display aspect 1.500000" and tvservice -s will return "720x480 @ 60Hz, interlaced" PAL - "display aspect 1.250000" and tvservice -s will return "720x576 @ 50Hz, interlaced" Shall i fill this as a bug agai...

michele.x

One of the features of the SCART system is the wide-screen switching implemented on pin 8 of the connector. If the voltage on that pin is ~12v the TV assumes 4/3: ~6v tells it to switch to 16/9. Of course if you are using an RCA-SCART adapter, there will be 0v on that pin. The other thing is that m...

michele.x

Sorry to get just in the middle but, there's a difference between having to learn things, and dropping a coin (really spending some more) looking for a PSU that works, a micro-usb cable that works, and just boot the whole thing without hanging. I've posted my problem here, and I see I'm not the onl...

michele.x

This is a really silly trick you can do with the Pi connected to an analog monitor. http://i.imgur.com/CnXgks.jpg http://i.imgur.com/6m83us.jpg It looks almost like an old CGA monitor, and reduces flicker too. That old monitor uses a tube developer for black and white tv sets so the white phosphor i...

michele.x

If I were to do this, what could I do for circuit protection or how would I do it safely? Old skool method: put a fast blow 1.20A fuse on the positive wire of the power supply. Why would the voltage drop across the main polyfuse vary according to whether the SD card is plugged in or not? This seems...

michele.x

I know a retired electrician that never used a computer before, that at age 75 got a second hand desktop PC and in less than six month was happily programming PIC microcontroller in assembly.

So it's never too late to learn programming.

michele.x

If it is a switcher there will be a certain amount of hash. Many of the wall wart types are just poorly rectified transformers, I have seen some with ripple of several volts. There are also well filtered wall wart transformers. I think the best bet is to buy power supplies with conformance marks en...

michele.x

Unfortunately the monitor manufacturers don't seem to have got the memo. Bottom of the barrel LCDs with only one input still seem to be VGA only rather than DVI/HDMI only Thats ass backwards, as the analog signal has to be converted to digital before it can be used, so the extra logic needed, (and ...

michele.x

The big advantage of the Pi over alternative approaches (Visual Studio, VirtualBox etc) is that you can easily interface with the real world. To light an LED using programming you've got two options : £30 Pi £1 of components or £300 PC (£3000 if you are a school who doesn't read contracts) £1 of co...

michele.x

Hi, I never used RiscoOS before, but having read the announce of the availability of a ready to use SD image I downloaded it and tried. I've the Pi connected to a standard definition monitor via the composite cable, and when I first started the image I got a barely readable screen, with tiny laqbels...

michele.x

And because still trying to support it would be extremely expensive still trying to support it didn't fit in with the plan to produce a cheap computer for the masses. I don't think that having to support VGA out is extremely expensive in itself, but the chip selected hasn't this feature, so adding ...

michele.x

But to answer you question, yes the GPU does have access to memory as a flat address space, according to the memory split at start-up. The Arm is given a chunk of memory which the Arm manages using its MMU. So technically feasible for the GPU to stomp Arm memory, I believe, but not not in any malic...

michele.x

I have been using Farnell for over 35 years and have always had excellent service until the last 9 months or so. In that time there have been more errors in my orders than there has been in the last 34 years. Orders being lost, wrong parts, missing parts and so on. Same happened with RS components....

michele.x

hello! im note quite sure im in the right forum, so please forgive me if I posted wrong Im currently in the makeing of a rpi NAS server and was wondering if anyone got any figures on the setup below, my thoughts was to set it up as; would really appreciate the input thanks I think the Raspberry Pi ...

michele.x

dan3008 wrote:Can i ask how much this box cost? I'm looking for something like this

I paid it 8,5 € in the shop. I suppose buying it online will cost less.

michele.x

So this avoids that a cheap hub backpowers the raspberry? Is it? Yes. This modified cable permits to stop the hub to send back the power to the upstream port and if the hub power is switched off makes the upstream port to power with a small voltage drop the hub. If you have a rev.2 board or a rev 1...

michele.x

some better hubs will not do this ;) it's ironic that poorly designed (asian) hubs can do something "better" than properly designed ones I'm not so sure that's actually better to have a backpowering hub, because there's no short circuit protection, and if are used with a different power supply conn...

Search found 74 matches

Re: This Is Just Silly

Re: Price Gouging

Re: Model A and current lead times

Re: HOWTO: YouTube on the Raspberry Pi - sans X B-)

Re: Gert Board Discontinued?

Re: Why no VGA?

Re: Screen becomes blurry after plugging hard drive

Re: 720x480 over Composite?

Re: 720x480 over Composite?

Re: 720x480 over Composite?

Re: Many GROSS design failures on the Pi -USB failures

Almost like CGA

Re: Power issues even with 'verified' PSU

Re: Is It Too Late To Start Learning?

Re: USB - the Elephant in our Room

Re: Why no VGA?

Re: Education value of Raspberry Pi?

Composite monitor

Re: Why no VGA?

Re: Big open news!

Re: No more Gert... kits

Re: rpi and usb performance (raid, samba/nfs)

Re: Tek berry

Re: Afraid to backpower?

Re: Powering the Pi from usb hub. Possible?