Have any of you electronics gurus worked with the Raspberry Pi model B board ? I am a newbie with this SBC, and I am running into various problems. If someone has had any experience configuring and making it work, I would like to discuss the issues I am facing, and for which I do not have any solution.
First of all, I have used Linux for almost 2 decades now, and have it on both my work machine(CentOS) and my home laptop(Fedora 17). So I am very confortable with Linux command line and use the 'dd' command to write the SD card. I started with OpenELEC-arm 3.0.0 and I use a 1.25 Amp 5.0Volt power supply. I use the composite video output with a Sony Bravia TV as monitor. The board would re-boot in an infinite loop. The OpenELEC logo would come up, followed by the XBMC logo, followed by a colorful screen with a menu bar across it. Then the above steps would repeat over and over. The device would not respond to any mouse or keyboard input. I re-flashed the SD card a few times, but nothing changed. I changed to OpenELEC 2.99.5, and now the board does not re-boot over and over, provided I press the 'keyboard's Esc key once the colorful screen comes up, but it pretty much ignores the keyboard. Also, once the colorful screen is on for a few minutes, it goes into a sort "gryed-out" appearance, and the device does does not respond at all. So, first of all I would like to get the device to a state where it respond to mouse and keyboard input, without any freezing over. I believe the power supply has more than enough juice for the board to support the mouse, keyboard etc., Any hints, suggestions would be of immense help. Thanks in advance.
Is it a rev 1 or rev 2 board? There have been issues with IR drop across resettable fuses. Rev 2 has a single resettable fuse at the 5V input. Rev
1 had two additional resettable fuses down-stream, powering the two USB sockets. Some USB keyboards draw surprisingly large currents. On a rev 1 board, I found it necessary to replace the USB fuses with wire links when using a Wi-Fi dongle. Obviously, doing so invalidated my warranty! Some people use powered USB hubs.
You might also try the standard Raspbian distro to start with, just to check-out the hardware setup.
I'm developing an embedded application on a "head-less" Model A. Head-less means no monitor connected, going in over SSH and FTP. Initially, I had to connect an Ethernet cable; but now I have Wi-Fi configured.
I'm using a powered hub both to power the raspi and to run the main peripherals, mine's revision 1, unmodified, so I can't back-feed the power
another way to configure them is to pull the SD card and plug it into a reader on a real computer and just edit it there. (easier on a linux desktop than windos, but I hear thet there are tools for windows that can handle ext2fs)
IME a robust and stable power supply is critical to Pi functionality. Can't beat a 5A linear supply connected by short leads via the pi's GPIO pins. You say you're happy with your PSU but have you examined the voltage levels under test conditions? The pi has a very narrow range of supply voltage it will work with and the symptoms you describe sound PSU related to me. Been there; done that.