Raspberry Pi Forums

felixfurtak

I've seen a couple of projects that get round the electrical safety issue by using remote control mains power sockets. These can be bought cheaply from pretty much anywhere and are usually already CE approved, etc. The Pi GPIOs can then be interfaced with the remote control which can control the rel...

felixfurtak

Hi Gert, Thanks for your reply. I thought PWM had constant frequency by definition. Maybe there are some variants? I'm not sure I understand why this would be impossible to generate, but thanks for the info. The problem that I have is that with a changing frequency, the switching losses in my transi...

felixfurtak

Hi Gert,

So in your code it seems that the PWM frequency will change depending on the duty cycle.

Is it possible to keep the PWM frequency the same, regardless of duty cycle?

This would be a preferred implementation for many people.

Felix

felixfurtak

Have a look a the Piface. http://pi.cs.man.ac.uk/ This has two relays on it that can switch mains voltage (up to 10A, as long as you are careful!). It also has 8 digital I/Os that could be used for other applications. It piggybacks on top of the Pi and costs 30 gbp. There is already some good simple...

felixfurtak

Hi Gordon,

I too have a PiFace, and haven't had a chance to play around with it much yet.

This code looks like a good starting point. What kernel/distro are you using?

Thanks,

Felix

felixfurtak

what is the output from :-

df -h ?

you could clear some space easily using

sudo apt-get clean

felixfurtak

I use mpd with client175.

I also tried mpd with groovebasin for a while and that worked well too.

Ampache looks entirely possible since you basically just need a LAMP server configuration.

felixfurtak

The spec of what you want is virtually the same as the spec of your current Asus Eee PC 900. Why not just keep using this, since it has the spec that you want? You can get extended life batteries for these computers very cheaply from Ebay, so you could have your 8 hours battery life at minimal cost ...

felixfurtak

Here is an update to the 8192cu.ko module for Arch 3.1.9-26 kernel. https://www.dropbox.com/s/7nyqd06dhs3j2bk/3.1.9-26-ARCH-8192cu.tar.gz To install, firstly create file /etc/modprobe.d/modprobe.conf and add the line blacklist.rtl8192cu Next wget http://dl.dropbox.com/s/7nyqd06dhs3j2bk/3.1.9-26-ARCH...

felixfurtak

mpd can do this. it's quite easy to set up

felixfurtak

dom wrote:@moobsen
There was another analogue audio fix a few days ago. Any better?
If there is still a problem, explain how I can reproduce it.

Dom, can you point me towards the fix that you are talking about? Is it in the main Arch repositories?

Thanks.

felixfurtak

The noise is still present on Arch (fully updated from the repositories).

felixfurtak

The current bcm sound module exhibits a burst of white noise at the beginning of playback, but only on analogue (3.5mm jack) output, not HDMI.

This is present in all distributions and there is, at present, no work around that I know of, apart form using an external usb sound card.

felixfurtak

I have had some success with a Creative Labs Soundblaster Live! 24-bit, USB sound card (Model Number SB0490). It works without any additional kernel modules in Arch and has both coaxial and optical SPDIF. The sound quality is much better than the analogue sound on the Pi. However, the support in Lin...

felixfurtak

@paat. I managed to stream music from mpd to a remote client (is this what you mean?), but it is not 100% reliable. I compiled the git version 0.17 from source and that worked slightly better, for me but I think the Pi may be struggling to re-compress audio stream on the fly.

felixfurtak

FYI, I also noticed SD card causing noise on the integrated audio. One SD card that I have seems to cause noticeable glitches in the sound, whereas the other does not.

Interestingly, the one that has the problems is a 32Gb Class 10, whereas the one without any audio glitches is a 2Gb Class 4.

felixfurtak

Hi Lesto, It fails for me on glibc update. Many of the other packages are dependent on glibc. The work around that I found was to hold back glibc until I had installed all the other, non-dependent packages and then disable bcm sound module, increase ram to 224Mb and add a swap partition. I'm not sur...

felixfurtak

Unfortunately this guide did not work for me. Just a note to say that there is a newer build of Arch available for download, but not on the main downloads page here: http://downloads.raspberrypi.org/downlo ... 6-2012.zip

felixfurtak

Shutting down could be problematic if a disk write is in progress when the shutdown occurs. There are a few options in this regard. 1) Leave it switched on all the time. It only consumes around 3 Watts, so not too much of a power drain 2) Shut down remotely using ssh command 3) Once set up, mount al...

felixfurtak

I have set up something similar to what you describe, but without any display or buttons. I use mpd running on Debian to stream BBC radio channels here in new zealand, and also use it as an mp3 jukebox. The pi is simply connected up via the 3.5mm jack to my amplifier for the audio. Also, I use a web...

felixfurtak

Yes, I have mpd up and running on the pi and have successfully used it to stream web radio. Setting up the backend daemon is reasonably easy and you can then choose a number of different front ends. I use client175 which is a web browser interface so the pi does not need to be physically connected t...

felixfurtak

Same issue here. white noise at the beginning of playback when using analogue output. The issue is not confined to mpd. Also hear the same behaviour using speaker-test or aplay I suspect it is due to the alpha status of the bcm sound module. To make matters worse, I also now hear glitches during pla...

felixfurtak

what .config file did you use?

felixfurtak

Same issue here. Repeated keypresses. Running Arch, with Acer wireless keyboard/mouse. No hub.

felixfurtak

Try booting it with the bare minimum of usb perhiperals plugged in. i.e. just a keyboard and no hub or anything like that.

Search found 47 matches

Re: Relay card for GPIO

Re: PWM code

Re: PWM code

Re: 240 v mains controller

Re: PiFace

Re: 3.5 GB rootfs is full?

Re: Ampache (not Apache)

Re: Rant: Netbooks were better three years ago

Re: Trying to get an RTL8188CUS wireless USB NIC working.

Re: Stream audio from command line

Re: Noice on analouge audio with mpd

Re: sound, maybe I'm an idiot

Re: sound, maybe I'm an idiot

Re: Noice on analouge audio with mpd

Re: mpd Web-Radio

Re: USB Audio

Re: full guide to first Arch update

Re: full guide to first Arch update

Re: My project : the raspberry radio

Re: My project : the raspberry radio

Re: mpd Web-Radio

Re: Noice on analouge audio with mpd

Re: Compiling Kernal Module

Re: New PSU... but "repeated keypresses" problem persists

Re: Having lots of problems...