Raspberry Pi Forums

cnt

Odd. I dug up a keyboard and HDMI cable, rebooted and was presented with the raspi-config screen, which i guess runs after initial install. After exiting the config screen and rebooting everything works as it should. My problem is very reproducible though and this really shouldn't happen. especially...

cnt

For whatever reason I get a connection timed out (rather than refused) when trying to connect to my raspberry pi after apt-get update; apt-get upgrade. Here's what I'm doing: 1) I have a Raspberry pi B with camera module 2) i'm flashing the latest raspbian (2014-01-07) 3) boot, ssh in, 'apt-get upda...

cnt

For those already somewhat familiar with mathematica (and, i guess, by extension the wolfram language) here's the language (as opposed to mathematica) documentation: http://reference.wolfram.com/language/ as well as the raspberry pi specific section http://reference.wolfram.com/language/guide/Raspbe...

cnt

with raspbian or another "standard" linux? no. The problem is that linux is not a real-time operating system. What that means is that you get no guarantees about timing. So, if your program was preempted during serial communication it may miss incoming bits or corrupt outgoing bytes. it is possible ...

cnt

I don't work with ham modems but i'm going to guess that they take RS-232 levels (-/+12v) not ttl levels. it may be easier to just get a usb to serial dongle. If you've got the logic levels worked out and are dead set on using GPIO you can set GPIO17 on pin 11 to alt function 3, which is RTS. Then y...

cnt

I've been having trouble finding whats different with the newest raspbian image.
Is there a changelog? In the past there has been a main page update for new images but I guess they're not doing that anymore.

cnt

Specifically the question: What hardware documentation will be available? Broadcom don’t release a full datasheet for the BCM2835, which is the chip at the heart of the Raspberry Pi. We will release a datasheet for the SoC which will cover the hardware exposed on the Raspi board e.g. the GPIOs. We w...

cnt

I actually have three of those same regulators (from another seller i think) and they work surprisingly well but they do get hot when you run up against 2A. Adding a heatsink may be a good idea.

cnt

Sorry. I think people are misinterpreting my posts. For some reason it got moved from suggestions to basic setup, which is the wrong place. I am /completely/ aware of my other options. Imaging 20 pi's is actually slower than logging into 20 pies over serial and changing scripts. Our institution does...

cnt

yes. I really don't have access to any partition but /boot without asking a bunch of students to hassle with weird 3rd party software on windows. I also don't want to write a set of instructions for every OS being used by students. Just being able to say "here's a 1kb file, put it on yours SD card b...

cnt

I recall that an earlier Rasbian image had a startup script that was easily changeable because it was in the fat (/boot) partition. I recently had to go around a class room and login over serial to a dozen rpis to change the wifi config file so students could connect to the wifi and log into their h...

cnt

flagstone78 wrote:Just a question. Does anyone know what the small holes by the p2/p3 are for?
Nice photo by the way. Definitely is going to be my background.

do you mean the 100mil space through holes? Those are for headers; I think for JTAG IIRC.

cnt

yah. try

Code: Select all

cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq

cnt

sounds like its rebooting in a loop. I'd make sure you're not dropping too much voltage across your cable or the polyfuse. Sadly 99% of problems come from power. Maybe try with just power and HDMI plugged in and see if it boots all the way.

cnt

In general it's a good idea to keep your topics to ONE forum at a time.

cnt

Very much an amateur but i am interested to know if running 2-4 RasPi's in a cluster to run a minecraft server would work and if it would be worth it, looking to replace my current server computer, not very energy efficient, its not only a minecraft server but minecraft being the most intensove ser...

cnt

I think the only change was they added the raspberry pi store. I'm sure you have the most recent version.

cnt

there are some terse examples here along with a pinout: http://elinux.org/RPi_Low-level_peripherals I'm not sure what you mean by schematic of io pins. They're all broken out SoC pins; nothing special except the I2C pins have 1.8k pull ups. IIRC you can get something like 7mA out of each gpio pin so...

cnt

I use this one AirLink101 AWLL5088 : http://www.amazon.com/dp/B003X26PMO It's tiny, doesn't block the other usb port, uses <100mA (according to my bench top PSU the whole pi with wifi usses < 500mA) and has drivers included with the current raspbian. oh yah and 12$ will amazon prime shipping is nice...

cnt

I was thinking about that but I'm not sure if one can directly access the CPU's I/O in PHP? sure it can. Its under /dev/ttyAMA0 and can be used like any serial port on any other linux computer (from the software point of view, not electrically of course.) If you want more than one serial port a USB...

cnt

as others suggested you can't really use a linear regulator unless you use one with an extremely low dropout. What I would suggest is using a 12v battery and getting a 5v DC out switching power supply. If you're willing to wait on shipping from china you can get them for as low as 2-3$ each.

cnt

the only thing that could cause that is a bad power supply. I have no idea how tolerant the rpi is to over voltage but that is not a good sign

cnt

according to the schematic ( http://www.raspberrypi.org/wp-content/uploads/2012/10/Raspberry-Pi-R2.0-Schematics-Issue2.2_027.pdf) ) the oscilator is 19.2Mhz not 25. I think your looking at the crystal for the ethernet. A cheap crystal (which the rpi probably has to keep costs down) has a typical err...

cnt

never mind. it works when run wpa_gui as root.

cnt

I bought the AirLink101 AWLL5088 because I had read threads that it works with the raspberry pi right out of the box. Unfortunately i'm having trouble with it. when I run wpa_gui I get nothing under the adapter drop down, so obviously I can't find any networks. If anyone has any ideas that would be ...

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