Raspberry Pi newsletter

Top new questions this week:

How to get a good overview over used space?

I wondered whether there is a command line application to give me a good (maybe visual) overview over the free/used space left on my sd card. ls -lh is nice but it does not show me how much space the …

sd-card ssh storage software-recommendation

asked by chocobai 3 votes answered by ortang 2 votes

QtMultimedia on RaspBerry Pi

I've been trying to get QtMultimedia working on Raspberry Pi for a few weeks now, cross-compiling using the BakeQtPi script, yet the QtMultimedia plugin never seems to find an appropriate service to …

video

asked by Andreas Carlbom 2 votes

Remote Desktop With xrdp

I have installed xrdp on my Raspberry Pi (which is connected to my TV) and a program called CoRD on my Mac that lets me connect to the RPi remotely and I am able to see the RPi desktop without any …

raspbian remote

asked by Philippe Olivier 2 votes answered by PiBorg 1 vote

Random GPIO values when ribbon cable is connected

I've installed the GPIO python library to read/write to GPIO pins. To get the state of the pins I'm using "gpio readall" which displays a table with all the pins from the RPI and I can see which pin …

gpio cable

asked by skip 2 votes answered by Tevo D 4 votes

Why does raspbian use ext4 for it's rootfs with journaling enabled?

ext4 with journaling is a robust file system that avoids corruption after power loss. However, this doesn't seem to work for Raspberry Pi's. I assume this is because memory cards (and/or our memory …

sd-card filesystem

asked by DonGar 2 votes answered by Lekensteyn 0 votes

Has anyone manage to drive a HD44780 LCD using a 74HC595 shift register?

Using Python, I am trying to interface with a HD44780 16x2 LCD display and would like to save a few pins from my Pi's GPIO banks by using a 74HC595 shift register. So far, I have managed to run the …

gpio hardware python electronics

asked by Monsieur David 1 vote answered by lenik 1 vote

Controlling 400 LEDs from a raspberry pi

I have a client who has several large bronze signboards, each with 100-150 little light bulbs on it, totaling approximately 400 bulbs. The bulbs are turned on and off on a schedule, currently by hand …

i2c led

asked by Moshe Katz 1 vote answered by gnibbler 0 votes

Greatest hits from previous weeks:

What do I need to know to power from batteries?

What voltage range can it accept? What sort of batteries are appropriate?

power-supply alternative-power

asked by Highly Irregular 41 votes answered by Andrew Larsson 24 votes

How do I supply power through the GPIO?

I have seen some examples of people powering their Raspberry Pis by wiring a DC "barrel plug" style power supply to the 5V and GND GPIO pins. What considerations should be taken when doing something …

gpio

asked by BitBobBang 14 votes answered by ppumkin 9 votes

Can you answer these?

How to use socat to transfer serial commands in a script over TCP/IP?

I have a web application that will constantly post some queries and get replies from a device through the serial port on Raspberry Pi. Like this: @cherrypy.expose def login (self, **data): …

python serial ethernet-port

asked by yvonnezoe 1 vote

How can I stream h264 video from Raspberry camera module via Apache/Nginx for remote stream view?

So I got the Raspberry Camera today and got stills working fine. Capture an image in jpeg format: raspistill -o image.jpg Capture a 5s video in h264 format: raspivid -o video.h264 …

webcam streaming-video camera

asked by ppumkin 1 vote