--> ap/xxxxx

__

Now deprecated in favour of: org/scrying

Trimble Lassen SQ and scrying: (2008.06.28:1)

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)

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)

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

1] Logs 10 bit value from adc0 to SRAM

2] Prompt for the following commands on usart0 (ATmega128 - interrupt driven serial input, 9600 baud, 8N0):

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 tech_notes2#40 scrying_tech_notes#51)

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:

EM related: http://members.tripod.com/:/Article1.htm

latest scrying collection: (2008.06.06:1)

Latest skrying design PCB: (2008.05.21:2)

New scrying PCB design: (2008.05.04:1)

All Kicad/Gerber files and schematic:

http://1010.co.uk/skry_may2007.tar.gz

Cypress CYWM6935 on the ATmega128 test code: (2008.04.25:1)

Simple port of wispy-curses (in wispy-tools-1.0 from: http://kismetwireless.net/code/wispy-tools-1.0.tar.gz ) spectrum analysis visualisation to the Cypress CYWM6935 running with ATmega128 on the scrying (http://scrying.org) platform.

On one side: http://1010.co.uk/xxxxx_cywm.c

And on the ATmega128: http://1010.co.uk/spectrumtest.c

References:

Sample SPI code: http://code.google.com/p/cywusb/source

Parallel port example: http://www.wireless.org.au/~jhecker/specan/

scrying solar/USB battery charging: (2008.04.01:1)

Re-working main scrying design for charging jumper (power, GND and SHDN of MAX1676 step-up DC-DC) to allow for both solar and USB-powered charging possibilities.

On the solar side looking at designs at:

http://prisms.cs.umass.edu/dome/uploads/File/turtle_c.pdf

http://www.maxim-ic.com/appnotes.cfm/an_pk/201

based on the DS2770 which appears hard to source.

Thus:

http://www.maxim-ic.com/appnotes.cfm/an_pk/484

using MAX856

could be adapted or:

http://ece-classweb.ucsd.edu:16080/winter06/ece191/Weekly_Presentation/Group4/Group4_FINAL_REPORT.doc

using CMOS switch (MAX4615) and voltage sensor (ICL7665A)

and which is well specified for 3x NiMH 2500 mAH batteries, 2x 100 mA 4.8v [MPT4.8-159 powerfilm] panels

and for USB:

http://www.maxim-ic.com/appnotes.cfm/appnote_number/960

fuse bits: (2008.02.21:2)

lfuse: fd

efuse: ff

hfuse: 99

read with:

avrdude -p m128 -u -c avrusb500 -t

and command:

d efuse // for example

skrying prototypes .02 (2008.02.21:1)

back from pcbcart - black silkscreen on black soldermask:

Second scrying board prototype: (2007.12.28:1)

returned from batchpcb

To test: banked memory access code (8x 64 Kb)

preliminary spectrum code for Cypress CYWM6935 on the ATmega128: (2007.12.05:2)

1] Borrowing heavily from sources mentioned below:

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

http://1010.co.uk/CYWUSB693x.h

cross-compiled scry serial-usb->OSC working. (2007.12.05:1)

1] svn co https://svn.openwrt.org/openwrt/branches/whiterussian/openwrt/

2] make menuconfig as per defaults// make

3] source environ

PATH=/root/openwrt/staging_dir_mipsel/usr/bin:/home/data/wrt54/svn/white/openwrt/staging_dir_mipsel/bin:/bin:/sbin:/usr/bin:/usr/sbin
PREFIX=/root/openwrt/staging_dir_mipsel/bin/

AR=$PREFIX/mipsel-linux-uclibc-ar
AS=$PREFIX/mipsel-linux-uclibc-as
LD=$PREFIX/mipsel-linux-uclibc-ld
NM=$PREFIX/mipsel-linux-uclibc-nm
CC=$PREFIX/mipsel-linux-uclibc-gcc
CPP=$PREFIX/mipsel-linux-uclibc-cpp
GCC=$PREFIX/mipsel-linux-uclibc-gcc
CC=$PREFIX/mipsel-linux-uclibc-gcc
CXX=$PREFIX/mipsel-linux-uclibc-g++
RANLIB=$PREFIX/mipsel-linux-uclibc-ranlib
LIBTOOL=/home/data/wrt54/svn/white/openwrt/toolchain_build_mipsel/binutils-2.16.1-build/ld/libtool

CFLAGS="-Os -s"

LDFLAGS="-L/root/openwrt/staging_dir_mipsel/usr/lib"

CPPFLAGS="-I/root/openwrt/staging_dir_mipsel/usr/include"
4] make both libOSC and mysendOSC

5] scp to /tmp and run

quick run through scry->hive/openwrt: (2007.12.04:2)

Here: 192.168.1.23. pass: admin. openwrt port 8080:

ipkg install kmod-usb-serial-ftdi

ipkg install kmod-usb-serial

insmod usbserial

insmod ftdi_sio

ls /dev/usb/tts/0

rough and ready serial (ttyUSB0) -> OSC code: (2007.12.04:1)

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

scrying battery board and rssi functional: (2007.12.01:1)

References for AVR/mega128 with Cypress CYWM6935 as a spectrum analyser: (2007.11.27:1)

Sample SPI code: http://code.google.com/p/cywusb/source

Parallel port example: http://www.wireless.org.au/~jhecker/specan/

Scan for 50uS RSSI (32 levels) for 83 channels

Further microcontroller example:

http://www.circuitcellar.com/library/print/0406/Armitage%2D189/

[todo: test and make use of serial library]

ATmega128 serial code: (2007.11.06:3)

1] TODO: TX and RX don't match up from USB/serial board to main board (to swap round on main).

2] C code to test simplest setup at 9600 baud 8N1 in Minicom:

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

thanks to: http://www.ituniv.se/~gu94joli//teaching/atmega128/index.php

Scrying technical: (2007.11.06:2)

1] Re-working Makefiles and prg_load_uc shell script for the 128(L):

The latter:

avrdude -p m128 -c avrusb500 -e -U flash:w:"$pfile"

[with programmer added to /etc/avrdude.conf and serial port specified there]

2] 5 pin programming header still messed up:

should be: GND, SCK(11) PDO(3), PDI(2), RESET(20)

but we have GND, 2, 3, 11, 20

constructed adapter but fix on final new prototype

3] Battery (to be re-etched) and USB can sit on bottom but make sure sniffer/transmission modules all feed through jumpers

4] Fusebits/fusebytes programming after:

http://www.nongnu.org/avrdude/user-manual/avrdude_8.html

http://www.scienceprog.com/programming-avr-fuse-bits-oscillator-settings/

http://wiki.elektronik-projekt.de/w/index.php/AVR_Fusebits_Tutorial

We arrive at (for external 8MHz crystal on a low power board):

avrdude -p m128 -u -c avrusb500 -t

and then:

w lfuse 0 0xfd

FD as low fuse byte

5] TODO: test serial/USB code but board is registered as serial device

Latest scrying boards: (2007.11.05:1)

From top right [clockwise]: CPU sans memory for test only, AD8313 100Mhz-.2.4GHz broadband receiver, battery, wireless spectrum analysis, USB

First scry prototype back from batchpcb: (2007.10.18:1 pcb#15 scrying_tech_notes#33)

A few (of my) mistakes.

Further scrying board designs: (2007.09.23:1)

[for conceptual detail please refer to http://scrying.org]

1] Main scrying board - AVR microcontroller and 512KB RAM:

[note: one jumper is missing on this board]

Board:

Schematic:

http://1010.co.uk/images/scrymain_newmemory.pdf

tar.gz of all KiCad files:

http://1010.co.uk/skrymain_rev001.tar.gz

superseded by:

http://1010.co.uk/skrymain_rev002.tar.gz

2] Battery board - with voltage regulation:

Board:

Schematic:

http://1010.co.uk/images/skrymain_rev001battery.pdf

tar.gz of all KiCad files:

http://1010.co.uk/images/skrybattery_rev001.tar.gz

3] USB connection board:

Board:

Schematic:

http://1010.co.uk/images/skry-usb-rev001.pdf

tar.gz of all KiCad files:

http://1010.co.uk/skryusb_rev001.tar.gz

Sc/krying boards PCB designs: (2007.09.20:2 scrying_tech_notes#31 pcb#13)

http://1010.co.uk/skry-usb-rev001.brd

http://1010.co.uk/skrymain_rev001.brd

http://1010.co.uk/skrymain_rev001battery.brd

Schematics to follow shortly...

Export Eagle -> KiCad (2007.09.20:1 scrying_tech_notes#30 pcb#12)

Unknown library with CR2450_KEYSTONE battery holder part for CR2450 battery. Exported from design at:

http://wiki.blinkenarea.org/bin/view/Blinkenarea/

1] In Eagle, Open Board then - File->Run->exp-project-lbr.ulp

2] Exports board as .lbr file and opens library editor

3] From here File->Run->exp-kicad-lib.ulp to convert to KiCad .mod

4] This last script is available from:

http://www.philcovington.com/BAK/exp-kicad-lib.ulp

KiCad drilling (2007.09.19:2 scrying_tech_notes#29 pcb#11)

file misaligned:

1] Plot settings - Gerber, plot origine: absolute, spot min: 0.015, Lines Width: 0.0010, all other settings though greyed out must be as defaults

2] Drill export settings - suppress leading zeroes, 2:4, drill origine: absolute, via drill 0.025, drill sheet: none

3] Check alignment using gerbv: http://gerbv.sourceforge.net/

free Gerber view package (KiCad's gerbview does not yet support examination of .drl drill files)

4] Check also by way of:

https://www.freedfm.com/!freedfmstep1.asp

#27

PCB ordering for prototype scrying: (2007.09.18:1)

1] Using BatchPCB [ http://www.batchpcb.com/faq.php ] for single prototype board. [ also looked at http://www.pcbcart.com/ but here we have DRC (Design Rules Checking) with email response.

2] Notes for using KiCad to set dimensions correctly (tracks and clearances as 0.01/10mil inches) and export correct Gerber files (in plot - check using gerbview) and drill files:

http://reprap.org/bin/view/Main/

3] We placed border using line/polygon tool on edge layer and then specified this in BatchPCB after upload (uploaded zip file with .drl drill file and all necessary .pho Gerber files.

[total $50 inc. postage for one prototype board approx 3 sq ins]

Parts for tests/scrying/USB: (2007.09.15:1)

Towards construction of a test board integrating ATmega128, RSSI (AD8303), and 802.11 spectrum analysis, serial and USB connection):

(headers also from conrad)

all SMD (0805) where possible:

128:

RSSI:

Spectrum:

Serial/USB (now using RL chip):

Also parts for 3.3v to 5v voltage regulation:

References:

Serial: http://www.geocities.com/vsurducan/electro/PIC/pic84lcd.htm

USB: http://www.sparkfun.com/commerce/present.php?p=BEE-8-

Spectrum: http://www.wireless.org.au/~jhecker/specan/

3.3V: http://www.arduino.cc/en/uploads/Main/arduino_bt06.pdf

Question of Palm Pilot level conversion

echoing to serial port /dev/ttyS0 from GNU Emacs (2007.08.16:1 annotation_software#3 scrying_tech_notes#25)

is fine scrying_tech_notes but other way.

eg. using terminal on Palm Pilot as entry system for annotations

1] tried using (insert-file-contents "/dev/ttyS0") which works but only after Ctrl-G this command do the characters appear.

2] modified pilot.el and memo-pilot-el from emacs-pilot-1.4 to work with importing memos to file - change to import into annotations buffer and also to avoid repetition - test export of memos

3] Kermit script:

http://linuxdevices.com/articles/AT5085702347.html

(but is not directly into buffer)

4] C - read one character wrapped in: (insert (shell-command-to-string COMMAND))

TODO

http://1010.co.uk/images/scrymain_newmemory.pdf

For main board (rather messy) with:

1] Changes to programming interface

2] Breakout of SPI for radio

3] new 68512 512Kb SRAM

also http://1010.co.uk/images/628512.lib library for KiCad

scrying board loose notes: (2007.07.30:1)

[with atmegascheme more or less in place...]

1] If we expand to 512K say using the 628512 (Hitachi by way of Reichelt) then we need 19 bits for each memory address and thus increases size of list pointers in interpreter. [16 banks 32k (16 bits)]

2] Question of availability of either CC2420 and NRF905 radio chips. Also if we use SPI bus on ATmega128 for communication with either of these.

3] Redesign of main memory board for 512K addressing (latches), fixed programmer header and SPI throughput.

4] Brief look over solar charging possibilities and designs - 2.4v from batteries (2xAAA. say 700 mAh), Maxim MAX1758 and associated voltage reg. chips. See references.

Quick references:

Memory access: http://www.mikrocontroller.net/topic/15889

TinyOS CC2420 codebase

CC2420 board: http://www.rfsolutions.co.uk/acatalog/:_Zigbee_Module.html

NRF905 and SPI: http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&t=47356

Solar: http://ece-classweb.ucsd.edu:16080/winter06/ece191/Weekly_Presentation/Group4/Group4_FINAL_REPORT.doc

50mA flexible solar panels: http://store.sundancesolar.com/3vol50maflex.html

[or they have 100mA 3.6v]

Harnessing Solar Power with Smart Power-Conversion Techniques:

http://www.maxim-ic.com/appnotes.cfm/appnote_number/484

ATmega Scheme latest: (2007.07.11:1 scrying_tech_notes#22 atmegascheme#10)

From ActorNet paper: [http://osl.cs.uiuc.edu/docs/actornet/kwonActorNet.pdf]

The callcc operator accesses the current continuation (CC)—an abstraction of the rest of the program remain- ing to execute. For example, the CC of the expression (add 1 (mul 2 ↓ 3)) at the ↓ mark can be regarded as a single-parameter function c1: (lambda (x) (c2 (mul 2 x))), where c2 is an another single-parameter function (lambda (x) (add 1 x)). In general, the CC can be regarded as a stack of single-parameter functions. The operand of callcc is a single-parameter function: when callcc is called the CC is passed to the operand function.

In actorNet, the CC and the value that will be passed to it form the state of an actor. Because an actor can read its current continuation, it can duplicate itself or migrate to an- other platform voluntarily by sending its continuation–value pair to another actor. The other actor simply evaluates the continuation on the value to duplicate the sender’s behavior.

For our own work stressing remote execution and concurrency:

Each ActorNet platform hosts a launcher actor which regards messages sent to it as programs and evaluates them.

Actors rather than iterated execution. User as actor in environment also.

Other features:

[from above paper also]

Other Schemes of note:

Icbins: http://www.accesscom.com/~darius/hacks/icbins/

Minischeme: ftp://ftp.cs.indiana.edu/pub/scheme-repository/imp/minischeme.tar.gz

s9fes: http://t3x.org/bits/s9fes/

Tinyscheme: http://tinyscheme.sourceforge.net/home.html

Programming ATmega128L on the scrying_board_reduced: (2007.07.06:2)

1] We wrap avrdude in a shell script. Now changed for 128 or 128L to:

avrdude -p m128 -c avrusb500 -e -U flash:w:"$pfile"

[programmer from: http://tuxgraphics.org/electronics/200510/article05101.shtml ]

2] ATmega128 does not use MOSI and MISO pins but rather PDI and PDO (pins 2 and 3, shared with serial RXD0 and TXD0) - all respectively...

So programming breakout should go to: 1.RESET//2.PDI//3.PDO//4.SCK/5.GND

and then it works.

Rejected DS1230/DS1249 NVRAMs ... (2007.06.29:1)

(1230 as used in ap0201) for scrying as size, cost and power consumption too high as compared to 62256 SRAM SMD chip.

Note: Three scrying radio modules to begin with: (2007.06.27:1)

well four as RSSI/signal strength is also included

When looking at chips listed below (to include also power consumption under TX, RX and any sleep conditions).

TinyOS brief notes: (2007.06.26:1 scrying_tech_notes#18 tech_notes2#9)

Installation: http://www.tinyos.net/tinyos-2.x/doc/html/install-tinyos.html

Tutorial: http://www.tinyos.net/tinyos-2.x/doc/html/tutorial/lesson1.html

Note source is in /opt/tinyos-2.x

More Scheme on the ATmega (2007.06.24:1 atmegascheme#9 scrying_tech_notes#17)

... now ATmega128 (low power) board:

[this is the reduced test board sans SRAM]:

http://1010.co.uk/images/scrymain_reduced-Component.pdf

http://1010.co.uk/images/scrymain_reduced-Copper.pdf

To be tested (1/ test fuse bits for 8 MHz 2/ programming 3/ serial)

Further links for ATMega Scheme implementation:

XS: Lisp on Lego MindStorms: http://www.yuasa.kuis.kyoto-u.ac.jp/~yuasa/xs/index.html

Scheme implementation for AVR-based Mica-series wireless sensor nodes:

http://osl.cs.uiuc.edu/nest/:-1.1.tar.gz

Kicad shortcuts: (2007.06.12:1 scrying_tech_notes#16 schematics#10 tech_notes2#8)

In PCBNEW:

PgUp and PgDn or Shift V to switch component/copper side when laying tracks and vias (to place via start on component side, drag track, right click to place via and then track continues on copper side)

F1 zoom in

F2 zoom out

F3 redraw (across also all kicad apps)

F4 centre at cursor

and further see also: http://xtronics.com/reference/kicad.html

TODO: check SMD sizes and quartz surface mount footprint

Messy first draft for main scrying board: (2007.06.11:3 scrying_tech_notes#15 schematics#9)

http://1010.co.uk/images/scrymain.pdf

Notes:

1] All power/conditioning is done on power module board (but thinking about it maybe put some capacitors across Vcc/GND close by - maybe not- TODO) - thus we expose 5v/3.3v input - 8x ADC, 8x digital pins, serial stuff

power as seperate module (2007.06.11:2)

Kicad/scrying boards... (2007.06.11:1 scrying_tech_notes#13 schematics#8 tech_notes2#7)

Notes:

1] Plenty of very useful libraries inc. for ATmega128 and the Hitachi 32Kx8 Static RAM: 62256 (also from Reichelt) at:

http://library.oshec.org/

The ATmega128 at: http://library.oshec.org/library/avr.lib

62256: http://library.oshec.org/library/memory-hitachi.lib

2] Making and connecting buses:

From Kicad online help:

In fact, due to the repetition command (Insert key), connections can be very quickly made in the following way, if component pins are aligned in increasing order (a common case in practice on components such as memories, microprocessors…):

Place the first label (for example PCA0)

Use the repetition command as much as needed to place members. EESchema will automatically create the next labels (PCA1, PCA2…) vertically aligned, theorycally on the position of the other pins.

Draw the wire under the first label. Then use the repetition command to place the other wires under the labels.

If needed, place the bus entries by the same way (Place the first entry, then use the repetition command).

Which boils down to:

/root/latestparts10.07

New pins (to share) for scrying board: (2007.06.08:2)

ADC - 4 pins for I/O board: PC0/3

Serial TX/RX - 2 pins for USB: PD0/1

Digital - 8 pins for I/O board: PD0/7

Programming - PB3/5 + reset (below)

GND/Power - 2 pins

Crystal OSC (16 MHz) and 2 caps (18pF) to: PB6/7 [Xno breakout]

Reset (PC6) for programmer

//could also break out all of PD0/7 - but we do need 16 pins for address and data to NVRAM - this would use PD0/7 and PC0/3 and some of PB shared with I/O board/programming

...is a bit messy

and we also need 3 control lines for NVRAM: ALE/RD/WR (PB0/2)

so have to multiplex (there are 20 lines I/O - we need 19 for memory so in theory 1 line (same maybe as ALE high/low for RAM) can latch I/O board (just PC0/7 - shared analogue/digital I/O))

...or use the larger/more expensive ATmega128...

For Emacs Lisp serial communication with scrying board interpreter: (2007.04.26:2)

We could either use comint (seperate process) and small C code or use:

(defvar device "/dev/ttyS0")

(defun scry-hello (command)
  (shell-command (format "echo -n \"%s;\" > %s" command device)))

Zigbee: Atmel chip AT86RF230 (2007.04.18:1)

xbee module also:

http://www.maxstream.net/products/xbee/xbee-oem-rf-module-zigbee.php

and:

http://itp.nyu.edu/~raf275/meshnetworking/XBee/XBee_example.html

http://mrtof.danslchamp.org/AXIC - Arduino Xbee Interface Circuit

Note also 3v parts: Atmega8L is 3v version (or use 168 part and in case of Arduino Bluetooth (3.3v and 5v needed use of MAX1676 DC-DC convertor and MC33269D-3.3 regulator)

for scrying/SRAM connection: (2007.04.03:1)

http://www.ethernut.de/en/hardware/enut1/index.html

CC2420 and low power ZigBee... (2007.03.18:1)

ripe for meshing.

http://www.chipcon.com/index.cfm?kat_id=2&subkat_id=12&dok_id=115

see also:

http://www.tinyos.net/scoop/special/hardware#telosplatform

oh, and also:

http://www.atmel.com/products/AVR/z-link/Default.asp

SRAM interface for scrying boards: (2007.03.08:1)

Samsung k6x0808c1d SRAM 32 KB from segor.de:

interfaced using 74HC573 latch in design borrowed from:

http://www.ethernut.de/pdf/enut130g-s1.pdf

50m (through two closed doors, hall onto street) or so transmission (2007.03.07:1)

without aerials now using: LPRS 400T/R 121 ...

secret is to send alternating 1s and 0s as stream (170) with code (133) in the middle:

  beginSerial(BAUD);
  while(1){
    x++;
		      serialWrite(170);

		      if (x>=55) {
		       PORTC|= (1<<PC5);
		       serialWrite(133);
		       x=0;
		      }		      

http://www.telecontrolli.com/eng/default-wproducts.html - RXQ-2: (2007.03.06:5)

Multichannel Intelligent Radio Transceiver Module

Laipac RLP/TLP4333 etc.

using the CC1000: (2007.03.06:4)

http://www.sklep.propox.com/index.php?d=produkt&id=1782

back in ~/scrying/avrscheme (2007.03.06:3)

... using Makefiles for testsend.c and testreceive.c

... serial communications working with pin 3 as TX and pin 4 as RX and obviously both boards sharing common ground (test code flashes once every second local LED, sends serial code (133), and receiever code waits for this to flash)

... using LPRS 400T/R 121 ... poor results sans/with antenna and these need to be properly grounded

scrying technical notes: (2007.03.06:2)

transmission and reception

antenna design (printed on PCB)

(untuned and tuned modules to test)

Manchester encoding

Possible chips - range (LOS), power consumption:

1] Cypress CYWUSB6935 2.4GHz DSSS radio transceiver (WirelessUSB-LR - 50m)

and 6936 samples from:

http://cypress.com/

as used in the iDwaRF:

http://www.chip45.com/index.pl?page=iDwaRF-168&lang=en&tax=1&dest=0

RX: 57,7 TX @ 10 dBm - 69,1 !

2] LPRS:

http://www.lprs.co.uk/main/product.info.php?productid=259

The 400T/R 121:

FM transmitter & receiver for long range application up to 1km 433 MHz

3] Low power:

CC1000 from http://www.chipcon.com/index.cfm?kat_id=2&subkat_id=12&dok_id=14

see also:

http://www.tinyos.net/tinyos-1.x/doc/mica2radio/CC1000.html

and:

http://www.mikrocontroller.net/topic/42442

Chipcon CC2420 (2.4 GHz Zigbee-compliant with stack) - is used by open source Telos wireless sensor network design

(RX: 19.7 mA, TX: 17.4 mA)

4] http://www.abacom-tech.com/data_sheets/ATX-433-IAuser.pdf

5] From Nordic Semiconductors:

nRF905: 433/866... 200m line of sight

used in this module:

http://www.sparkfun.com/commerce/product_info.php?products_id=153#

(RX: 12.5. TX: 28 at 10dBm to 10 at -14)

nRF24L01: 2.4 GHz. 80m LOS.

11 mA (peak TX) at -0 dBm output power, dropping to 7 mA (peak TX) at -18 dBm output power. In receive mode (RX) the device requires 12.5 mA when receiving at its maximum rate of 2 Mbit/s.

for power see: http://www.msc-ge.com/frame/e/produkte/ele_kom/rf_dev/rf_components.html

6] XBee:

http://www.maxstream.net/products/xbee/dev-kit-zigbee.php

LOS:

XBee: 100m XBee-PRO: 1.6 km but outside European legislation

Transmit Current: XBee: 45 mA (@ 3.3 V) XBee PRO: 270 mA

Receive: 50 and 55 respectively

___

see also:

scrying_notes scrying