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by speculatrix
Sat Apr 02, 2016 3:07 pm
Forum: Troubleshooting
Topic: Time is suddenly running slow
Replies: 5
Views: 950

Re: Time is suddenly running slow

Yeah, I tried the stop, force, restart route - no dice - it never returns (waited 10 mins the last time). I was also highly suspicious of the output from ntpq -p - all those zeroes for delay, offset and jitter. I tried ntpdate: [email protected]:~# ntpdate -buv 2 Apr 10:55:37 ntpdate[3014]: ntpdate 4.2.6p...
by speculatrix
Fri Apr 01, 2016 8:46 am
Forum: Troubleshooting
Topic: Time is suddenly running slow
Replies: 5
Views: 950

Re: Time is suddenly running slow

Just a quick update: I realised the RPi hadn't been updated in a while so ... apt-get update && apt-get -y upgrade ... 195 upgrades later. Still no better. Uninstalled ntp and re-installed it. Now the clock is running 44 minutes slow. Did a restart - no better. I'm starting to think this RPi is like...
by speculatrix
Fri Apr 01, 2016 7:23 am
Forum: Troubleshooting
Topic: Time is suddenly running slow
Replies: 5
Views: 950

Time is suddenly running slow

I've got an RPi that I used to run an alarm clock (full details are here ). It's been running fine for three years, but about a week ago suddenly decided that its clock should run slow by about 19 minutes. The machine is connected to the network via Ethernet. I tried restarting NTP with /etc/init.d/...
by speculatrix
Sat Oct 12, 2013 8:36 pm
Forum: Troubleshooting
Topic: UART issues - only works one way [solved]
Replies: 1
Views: 611

Re: UART issues - only works one way

Okay, belay that. (Why do I always solve problems that I've spent hours battling with, just minutes after I post a call for help? ;) ) Turns out that, while the script I'd downloaded that checks for whether the UART is enabled said 'yes', I was using a new image of Raspbian and hadn't edited /boot/c...
by speculatrix
Sat Oct 12, 2013 8:11 pm
Forum: Troubleshooting
Topic: UART issues - only works one way [solved]
Replies: 1
Views: 611

UART issues - only works one way [solved]

I've hit a weird snag with serial comms via the UART. I had a Python class that was working for this. But I haven't used it in a while and I recently decided to 'improve' it. Now it only works in one direction! The RPi can send okay, but not receive. The setup is this. The serial console is enabled ...
by speculatrix
Fri Jan 18, 2013 11:51 am
Forum: Graphics, sound and multimedia
Topic: USB soundcard...Finally good (non HDMI) Analog Audio
Replies: 147
Views: 160379

Re: USB soundcard...Finally good (non HDMI) Analog Audio

Thanks - I'll try all of that & report back...
by speculatrix
Fri Jan 18, 2013 10:49 am
Forum: Graphics, sound and multimedia
Topic: USB soundcard...Finally good (non HDMI) Analog Audio
Replies: 147
Views: 160379

Re: USB soundcard...Finally good (non HDMI) Analog Audio

Having thought I'd solved all my problems with sound, I now have a new one. For my dawnclock project ( link ) I'm using the USB sound card recommended in this thread, which is working fine. But because I'm using the headphone jack, I'm also using a small amplifier board to boost the signal. It looks...
by speculatrix
Mon Jan 14, 2013 10:17 am
Forum: Graphics, sound and multimedia
Topic: USB soundcard...Finally good (non HDMI) Analog Audio
Replies: 147
Views: 160379

Re: USB soundcard...Finally good (non HDMI) Analog Audio

Just wanted to say another thanks for the heads-up re that USB sound card. I've got it working great now, via a tiny amp board bought from Aliexpress, for my dawn clock project. You can read about it here: http://speculatrix.tumblr.com/post/4051 ... pt-3-audio
by speculatrix
Sun Jan 13, 2013 4:31 pm
Forum: Other projects
Topic: Dawn Clock
Replies: 2
Views: 1176

Re: Dawn Clock

Just added Part 2 to the blog... http://speculatrix.tumblr.com/

It has details of much of the hardware used.
by speculatrix
Sun Jan 13, 2013 1:06 pm
Forum: Other projects
Topic: Dawn Clock
Replies: 2
Views: 1176

Dawn Clock

For about 18 months, I've been waking up to an Arduino-powered dawn clock, which slowly switches on lights, plays bird song and, at alarm time, music. But it was very limited, so I've now created the Mk.II dawn clock using an RPi. I'm blogging about it here: http://speculatrix.tumblr.com/ http://www...
by speculatrix
Sat Dec 22, 2012 8:03 pm
Forum: General programming discussion
Topic: Assembly Language Made Easy
Replies: 28
Views: 7769

Re: Assembly Language Made Easy

Hi Bruce,

Good to see you here. Haven't seen you since the old Acorn User days. Also glad to see you're still in the book business. You always did have a knack of explaining technical issues well.

All the best,

Steve Mansfield
by speculatrix
Wed Dec 05, 2012 6:15 pm
Forum: Graphics, sound and multimedia
Topic: USB soundcard...Finally good (non HDMI) Analog Audio
Replies: 147
Views: 160379

Re: USB soundcard...Finally good (non HDMI) Analog Audio

Okay, so I got one of the same USB sound cards you got. It seems to be recognised by the system. But I can't get anything to play through it using command-line tools. I have the RPi in a box running as a headless server and one of the things it does is play music as an alarm clock, so I need to play...
by speculatrix
Tue Nov 27, 2012 8:46 pm
Forum: Networking and servers
Topic: Wireshark on RPi ?
Replies: 3
Views: 5029

Re: Wireshark on RPi ?

Google 'pwnpi'
by speculatrix
Sun Nov 11, 2012 8:41 am
Forum: Graphics, sound and multimedia
Topic: USB soundcard...Finally good (non HDMI) Analog Audio
Replies: 147
Views: 160379

Re: USB soundcard...Finally good Analog Audio

Thanks for the info. Probably not going to work for me, then. I'm building a 'dawn clock' - actually an upgrade of a current one based on an Arduino and wave shield. I need to be able to play MP3s programmatically. I tried amplifying the headphone output with one of these mono amps , but it doesn't ...
by speculatrix
Sat Nov 10, 2012 4:16 pm
Forum: Graphics, sound and multimedia
Topic: USB soundcard...Finally good (non HDMI) Analog Audio
Replies: 147
Views: 160379

Re: USB soundcard...Finally good Analog Audio

That looks like quite a fat USB device. Does it block the other USB port?

And do you think it would be possible to drive a small 8ohm or 4ohm speaker directly from the headphone jack?
by speculatrix
Mon Nov 05, 2012 8:33 pm
Forum: Graphics, sound and multimedia
Topic: Basic sound out of audio jack
Replies: 0
Views: 1476

Basic sound out of audio jack

I'm building a 'dawn clock' designed to wake me up with music. I've already built one using an Arduino Uno + Wave Shield but am now creating a more sophisticated model using an RPi. The bit that's proving challenging is the audio output. I need something simple because it all has to go into the same...
by speculatrix
Mon Oct 15, 2012 8:25 am
Forum: General discussion
Topic: Raspberry Pi with 512mb RAM in the Wild and Element14...
Replies: 213
Views: 46404

Re: Raspberry Pi with 512mb RAM in the Wild and Element14...

It's worth noting that RS simply lists 512MB in the specs, but E14 is making a big splash about it - very definitely not just a slip in the spec list. Trouble is, I'm in France and when I try to order from E14 I get redirected to the export site where the spec is still listed as 256MB - so I can't b...
by speculatrix
Fri Oct 12, 2012 3:54 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Second SIO/UART
Replies: 11
Views: 16276

Re: Second SIO/UART

Okay, I think I see the problem. I presume the BeagleBone gets around these issues at a hardware level. All this is way beyond my expertise...
by speculatrix
Thu Oct 11, 2012 1:20 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Second SIO/UART
Replies: 11
Views: 16276

Re: Second SIO/UART

I'm also interested in this. I'm thinking of using an RPI in place of a BeagleBone for a robotics project. The problem is that I currently use three of the BB's four UARTs! Low level coding does not sound like the kind of thing that I should be attempting ;) and while the maxim chips look interestin...
by speculatrix
Tue Sep 18, 2012 5:13 pm
Forum: General discussion
Topic: What's the plural of Raspberry Pi.
Replies: 53
Views: 16303

Re: What's the plural of Raspberry Pi.

Okay, speaking as an editor and ex-sub (and having checked with my sub-editor and classics grad wife)... Pi is the English transliteration for the Greek letter 'P'. In English, the plural of P would be Ps. Of course, if you were to decide that Pi is somehow an adjective - that the machine is a Raspb...
by speculatrix
Tue Sep 18, 2012 4:39 pm
Forum: HATs and other add-ons
Topic: Gertboard shipping date.
Replies: 279
Views: 32041

Re: Gertboard shipping date.

I also got my shipping confirmation from Tandy today, for an order placed yesterday. This is for the deluxe version. Might take a bit longer to get to me as I'm in France.
by speculatrix
Tue Aug 14, 2012 10:37 am
Forum: Other projects
Topic: ModMyPi Raspberry Pi Cases
Replies: 96
Views: 30975

Re: ModMyPi Raspberry Pi Cases

For reference, ordered mine on 12 June, they arrived (in France) this morning.
by speculatrix
Sun Jul 29, 2012 7:54 am
Forum: General discussion
Topic: Why no Olympic themed projects
Replies: 7
Views: 874

Re: Why no Olympic themed projects

Given that the only interesting part of the Olympics is already over, it's probably too late to do anything about it now...
by speculatrix
Sun Jul 22, 2012 7:20 am
Forum: Automation, sensing and robotics
Topic: Using RPi as a Standard Robotics Interface
Replies: 33
Views: 10500

Re: Using RPi as a Standard Robotics Interface

@ speculatrix do you have more information on your project? As in all of it! Unfortunately, the robotics project has had to take a back seat while I concentrate on other things - such as earning a living. -=sigh=- What I have been doing has mostly involved tinkering with the control systems. Althou...

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