ap/xxxxx/1010

org-mode/firefox and planner: (2008.07.17:1)

Thu, 17 Jul 2008 11:56:00 +0100

Using: http://turingmachine.org/~dmg/temp/org-annotation-helper.el

as per instructions to make org-mode remember notes from firefox.

Needed to set:

(setq planner-bookmark-take-note-after-set-bookmark-flag nil)

to avoid remember-bookmark-remember cycle.

TODO: convert to org-mode publishing (sort out directories, blog, rss, pickle) for 1010.co.uk

org-mode and org-info.js: (2008.07.16:1)

Wed, 16 Jul 2008 18:34:00 +0100

1] http://orgmode.org/worg/code/ and:

http://orgmode.org/worg/org-faq.php


(info "(org) Javascript support")

;; add the following to .org document as first line:

#+INFOJS_OPT: view:info toc:nil

;; export with C-c C-e h

3] the result: http://1010.co.uk/demons2.html

4] TODO:

a) test with org-publish

b) fix publishing scheme, css and directories

c) integration of site, local presentations, code

avr/pwm/pd: (2008.07.14:1)

Mon, 14 Jul 2008 20:13:00 +0100

Starting pd-pwm project (for easy usb->pwm control of motors, and lights under Pure Data using a single ATmega8 microcontroller and a few parts) based on gnusb project:

http://gnusb.sourceforge.net/

... modified for:

1] Low budget hardware (ATmega8) supporting 2+ PWM 8 bit channels so D+ and D- of USB port are now on PORTD.

2] Removed sleep and bootloader functionality.

3] Improved support for Pure Data (new Makefile, fixed PD code)

4] Added 6 channels of PWM support (for ATmega168 option or chained Mega8s (serial))

VLF receiver version 2: (2008.07.10:1)

Thu, 10 Jul 2008 21:19:00 +0100

Based on the Nasa INSPIRE VLF-3 receiver. All Gerber files, schematic and Kicad files:

http://1010.co.uk/vlf2.tar.gz

Images and recordings to follow. Also to be filed under EM resources.

Further ELF/VLF links:

VLF audio stream: http://www.spaceweather.com/glossary/inspire.html

VLF listener's handbook: http://www.auroralchorus.com/vlfhndbk.htm

http://www.home.pon.net/785/equipment/build_your_own.htm

http://www.vlf.it/fft_beginners/fft_beginners.html

http://istp.gsfc.nasa.gov/istp/polar/polar_pwi_descs.html

http://www-star.stanford.edu/~vlf/ulp_reciv/ulp.htm

http://www.home.pon.net/785/equipment/homemade_b-field_receiver.htm

http://www.da4e.nl/elfspecial.html

Trimble Lassen SQ and scrying: (2008.06.28:1)

Sat, 28 Jun 2008 21:22:00 +0100

Sample code to switch SQ to NMEA 4800 bps 8N1:

unsigned char gps0[]={0x10,0x7A,0x00,0x01,0x00,0x00,0x00,0x01,0x10,0x03}; // last but two: GGA and GSV also = 0x09 ... just GGA=0x01 //ends 0x01,0x03

unsigned char gps1[]={0x10,0xBC,0xFF,0x06,0x06,0x03,0x00,0x00,0x00,0x02,0x04,0x00,0x10,0x03};

/* output to 2nd serial port */

and further:

http://scrying.svn.sourceforge.net/viewvc/scrying/

scrying and logging notes: (2008.06.26:1)

Thu, 26 Jun 2008 11:20:00 +0100

1] Latest serial/memory logging code:

http://scrying.svn.sourceforge.net/viewvc/scrying/

Programmed with:

avrdude -c avrusb500 -p m128 -P /dev/ttyUSB0 -U lfuse:w:0xFD:m -U hfuse:w:0x99:m -U efuse:w:0xFF:m -U flash:w:serialtest.hex

2] Commands:

xxxxx:help                                                                                        
log: output log                                                                                   
lv: print one sample
nm: show counter
res: reset counter
p: pause
s: start
d1/d2/d3: delays short->long
str: stream
q: quit stream
8bit: char output
10: 10 bit integer output
ant: antenna src
rssi: rssi board src
help: helps

3] As an aside remix of iwspy signal strength logging from:

http://users.skynet.be/chricat/signal/signal-strength.html

iwspy eth0 192.168.1.1

cat iwspy.sh

#!/bin/bash
while true
do
        iwspy eth0
        sleep 1
done | grep Signal

./iwspy.sh > iwtest

cat iwperl.pl

#!/usr/bin/perl
while ($line = <STDIN>)
{
       
        if ($line =~ /level=(-[0-9]+).*level=(-[0-9]+)/)
                {
                print "$1 $2\n";
                chomp($line=<STDIN>);
                }
}

cat iwtest | ./iwperl.pl > iwproc

## and in gnuplot-mode buffer (send buffer with C-c C-b):

set title "iwspy"
set yrange [-120:-50]
set ylabel "dBm"
set xlabel "Sample"
set term png
#
set output 'xxxxx-strength.png'
plot 'iwproc' using :1 title "Signal", 'iwproc' using :2 title "Noise"

Logging code for scrying: (2008.06.20:2)

Fri, 20 Jun 2008 12:25:00 +0100

http://1010.co.uk/serialtest.c

1] Logs 10 bit value from adc0 to SRAM

2] Prompt for the following commands on usart0 (ATmega128):

log: dump log to serial port

live: show live reading of ADC

num: show log counter

reset: reset log counter

3] Data dumped to file by way of minicom and graphed with Octave:

Software defined radio/ITC/Baudline notes and references: (2008.06.20:1)

Fri, 20 Jun 2008 12:14:00 +0100

1] Building and testing GNU Radio (Debian testing):

svn co http://gnuradio.org/svn/gnuradio/trunk gnuradio

apt-get install libtool portaudio19-dev alsa-dev alsa-source python-wxgtk2.6 python-numpy

export PYTHONPATH=/usr/local/lib/python2.4/site-packages/

./bootstrap

./configure

make install

ldconfig

cd ~/gnuradio/gnuradio-examples/python/audio

./audio_fft.py -I hw:0,0 -S

References:

GNU Radio tutorials: http://www.nd.edu/~jnl/sdr/docs/tutorials/1.pdf

http://www.spectrum.ieee.org/oct06/4654/toolsb1

http://www.kd7lmo.net/ground_gnuradio.html

SDR: http://f4dan.free.fr/sdr_eng.html

2] Demodulation using Baudline:

Ref: http://www.domenech.org/homebrew-sdr/receiver-3.htm

http://www.baudline.com/manual/glossary.html

http://www.burtonmackenzie.com/2007/05/poor-mans-spectrum-analyzer.html

http://www.febo.com/pages/baudline/

Use of decimate and down-mixer:

Down-mixer allows us to move across frequency range down-sampling.

What is decimation?

"a technique for reducing the number of samples in a discrete-time signal."

Play deck window - advanced features: high pass and low pass filters, use of shift for demodulation.

3] ITC/EVP ref:

commandline EVP: (2008.06.14:1)

Sat, 14 Jun 2008 20:17:00 +0100

rough port of some features from EVPmaker:

http://www.stefanbion.de/evpmaker/index_e.htm

for cutups of audio recordings, text usw.

gcc evp.c -o evp

cat crying | ./evp 40 10 1000 0

arguments: to, from, window size, overlap (1 or 0)

latest scrying collection: (2008.06.06:1)

Fri, 06 Jun 2008 16:44:00 +0100