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by aquarat
Sat Aug 25, 2012 12:05 am
Forum: Other projects
Topic: NTP PPS
Replies: 285
Views: 136926

Re: NTP PPS

Hi Chris In my experience the offset on the NMEA data has always been quite large. That 432.26 represents milliseconds, right ? I ran into some fun with GPSd; the repository package kept giving segmentation faults. I tried compiling GPSd myself but it did the same thing. I have now switched to ntpd'...
by aquarat
Fri Aug 24, 2012 10:26 am
Forum: Other projects
Topic: NTP PPS
Replies: 285
Views: 136926

Re: NTP PPS

remote refid st t when poll reach delay offset jitter ============================================================================== oPPS(0) .PPS. 0 l 14 16 377 0.000 -15.084 3.718 +SHM(0) .NMEA. 0 l 45 64 7 0.000 -432.26 5.229 *41.216.193.26 ( 41.73.40.11 2 u 34 64 17 37.625 -10.666 11.477 :D
by aquarat
Fri Aug 24, 2012 9:29 am
Forum: Other projects
Topic: NTP PPS
Replies: 285
Views: 136926

Re: NTP PPS

I tried ntp-dev-4.2.7p295 and now ntp is detecting the PPS yay :) .
by aquarat
Thu Aug 23, 2012 10:19 pm
Forum: Other projects
Topic: NTP PPS
Replies: 285
Views: 136926

Re: NTP PPS

Hi I don't know why but I've been unable to get ntpd to recognise the PPS device. PPSTest indicates a good PPS on /dev/pps0 and I've configured ntp.conf as suggested in previous posts, but for some reason NTPd doesn't see the PPS. I installed GPSd and added "server 127.127.28.0 minpoll 4 maxpoll 4" ...
by aquarat
Mon Aug 20, 2012 10:27 pm
Forum: Other projects
Topic: NTP PPS
Replies: 285
Views: 136926

Re: NTP PPS

I tried the voltage-divider + GPS-PPS in series idea and... it works :D :D . I've been running ppstest for a few minutes and it hasn't shown any dropped pulses.
by aquarat
Mon Aug 20, 2012 8:33 pm
Forum: Other projects
Topic: NTP PPS
Replies: 285
Views: 136926

Re: NTP PPS

If I had a clear view of the sky without having to hang my GPS up in my window I'd be all over that.
It has an external antenna port, you can connect a higher-gain outside antenna like that :) .
by aquarat
Sun Aug 19, 2012 9:13 am
Forum: Networking and servers
Topic: APRS tracking mash-up
Replies: 13
Views: 6917

Re: APRS tracking mash-up

Not exactly what you're doing, but I've just set up a Pi to act as an APRS digipeater and iGate using an application called aprx connected to a Byonics TinyTrack4 via ttyAMA0 -> RS232.
by aquarat
Sun Aug 19, 2012 9:10 am
Forum: Other projects
Topic: NTP PPS
Replies: 285
Views: 136926

Re: NTP PPS

Very cool chrisrpt. I've decided to rather connect my Trimble GPS to a PC Engines Alix Board via serial (due to the erratic PPS). ADAFruit makes an interesting GPS module : http://adafruit.com/products/746 . It runs off 3.3V to 5V and it runs TTL for rx/tx and pps. It only uses 20ma when running. I'...
by aquarat
Sat Aug 18, 2012 4:42 pm
Forum: HATs and other add-ons
Topic: Looking for add-on that is capable of receiving VHF 135 - 17
Replies: 6
Views: 3168

Re: Looking for add-on that is capable of receiving VHF 135

Hey scorpz

Sorry I didn't reply, I didn't have this topic set up to send me notifications. Did you manage to get it working ?
by aquarat
Fri Aug 17, 2012 3:40 pm
Forum: Other projects
Topic: NTP PPS
Replies: 285
Views: 136926

Re: NTP PPS

Hey chrisprt Thanks for checking, LVBoost looks cool. I connected an LED to the PPS output and it emits a very dim light. Does it sound sane connecting a 0.5V power source in series with the PPS output and then running the result into the Pi ? The result would be 0.5V at rest and 3.2v when pulsing. ...
by aquarat
Fri Aug 17, 2012 9:05 am
Forum: Other projects
Topic: NTP PPS
Replies: 285
Views: 136926

Re: NTP PPS

Hi I tried installing chrisrpt's pps kernel and modules. I also compiled ntp 4.2.6p3 . PPSTest works, but unfortunately the output from PPSTest is erratic (it skips pulses) : ppstest /dev/pps1 trying PPS source "/dev/pps1" found PPS source "/dev/pps1" ok, found 1 source(s), now start fetching data.....
by aquarat
Thu Aug 02, 2012 9:44 am
Forum: Other projects
Topic: NTP PPS
Replies: 285
Views: 136926

Re: NTP PPS

/me starts downloading :) I need to try and work out what the PPS voltage is... I can't find it anywhere in the manual. I've also got a Motorocola OnCore UT+ which is just a GPS (as opposed to a GPS +OCXO). It has TTL pins which would work nicely with the UART on the Pi. The UT+ has a 5V PPS : http:...
by aquarat
Tue Jul 31, 2012 8:23 am
Forum: Other projects
Topic: NTP PPS
Replies: 285
Views: 136926

Re: NTP PPS

Hi Chrisprt Would it be possible for you to post your kernel to a file-sharing site ? I have a Trimble Thunderbolt-E GPS/OCXO which currently runs into a an x86 machine and forms part of the NTP Pool project... it would be great to hand this duty off to a Pi :) . Side note... my Raspberry Pis automa...
by aquarat
Mon Jul 30, 2012 7:48 am
Forum: General programming discussion
Topic: java issues
Replies: 2
Views: 2381

Re: java issues

Hi midders You'll need a package called openjdk-6-jdk installed if you want "javac". "javac" is the Java compiler and "java" is the VM. You can install this by running : sudo apt-get install openjdk-6-jre openjdk-6-jdk That'll install both the VM and the compiler. I just tried compiling your code on...
by aquarat
Mon Jul 30, 2012 7:16 am
Forum: Other programming languages
Topic: Java experiences?
Replies: 29
Views: 20090

Re: Java experiences?

The Raspberry Pi is an extremely cheap and versatile machine. It's good value for money and fun, so I'm prepared to spend a bit more time getting stuff working on it. That said, I didn't have to do anything out of the ordinary to get Java working. I flashed Raspbian to a 32GB SDHC card and then I in...
by aquarat
Sun Jul 29, 2012 5:06 pm
Forum: General programming discussion
Topic: How I compiled MariaDB and Phidget drivers
Replies: 7
Views: 12482

How I compiled MariaDB and Phidget drivers

This may seem a bit ridiculous, but both MariaDB (fork of mySQL) and the Phidget interface drivers compile with little pain on Raspbian. I say rediculous because MariaDB eats half of the RAM (in 240/16 mode). To compile MariaDB I did this (commands executed as root) : wget "http://downloads.mariadb....
by aquarat
Sat Jul 28, 2012 11:03 pm
Forum: Other programming languages
Topic: Reading from I/O pins using Java
Replies: 2
Views: 4712

Re: Reading from I/O pins using Java

Hi I found this : public static void main(String[] args) { GpioGateway gpio = new GpioGatewayImpl(); //set up the GPIO channels - one input and one output gpio.setup(Boardpin.PIN11_GPIO17, Direction.IN); gpio.setup(Boardpin.PIN12_GPIO18, Direction.OUT); // input from pin 11 boolean input_value = gpi...
by aquarat
Sat Jul 28, 2012 10:44 pm
Forum: General discussion
Topic: RS vs Farnell build quality
Replies: 5
Views: 1273

Re: RS vs Farnell build quality

I've got three boards and they all look really good. Two of them came from Farnell and one came from RS.

There's a tiny little "tooth" sticking out on the corner next to the power connector on the board from Farnell, but it's really small; easily smaller than 1mm.
by aquarat
Sat Jul 28, 2012 10:29 pm
Forum: HATs and other add-ons
Topic: Looking for add-on that is capable of receiving VHF 135 - 17
Replies: 6
Views: 3168

Re: Looking for add-on that is capable of receiving VHF 135

Ahhh... well... I'm a bit crazy sometimes; I have a POCSAG transmitter set up and I'm using one of my Raspberry Pis to control it, amongst other things. I use actual pagers for receiving. This page should give you an idea of what's required : http://tfn.mine.nu/motorola.html There are two options : ...
by aquarat
Sat Jul 28, 2012 9:16 pm
Forum: HATs and other add-ons
Topic: Looking for add-on that is capable of receiving VHF 135 - 17
Replies: 6
Views: 3168

Re: Looking for add-on that is capable of receiving VHF 135

Hi What messages are you trying to receive ? Within that frequency group you have a number of different modulation types and on top of them protocols. These are often voice and data. Voice is generally FM (Frequency Modulation) and data can be any number of methods. Voice could be input into the Pi ...
by aquarat
Sat Jul 28, 2012 5:57 pm
Forum: Advanced users
Topic: 240mb/16mb split
Replies: 12
Views: 7133

Re: 240mb/16mb split

I don't have a display connected and I'm not running a GUI desktop... so this is particularly useful for me. Thanks :)
by aquarat
Fri Jul 27, 2012 9:10 am
Forum: Debian
Topic: apt-get segmentation fault (fixed)
Replies: 0
Views: 6691

apt-get segmentation fault (fixed)

Hi I ran into an issue with Debian (I think it's Debian and not Raspbian) on one of my pis and I just thought the experience could help someone else : I cloned an existing SD card to a new SD card using DD. The image on the card didn't have much in the way of modifications, namely : - Memory split s...
by aquarat
Thu Jul 26, 2012 2:38 pm
Forum: Networking and servers
Topic: Webmin Guide
Replies: 27
Views: 116466

Re: Webmin Guide

I just followed the guide on this page : http://www.webmin.com/deb.html Which entailed that I add the following : deb http://download.webmin.com/download/repository sarge contrib deb http://webmin.mirror.somersettechsolutions.co.uk/repository sarge contrib to /etc/apt/sources.list I then ran these c...

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