Harry Pfeifer wrote:

> I am hoping that someone out there can suggest a simple and
> inexpensive
> method of generating and decoding the audio tones, which has the
> necessary
> frequency accuracy so that all ten systems can stay in tune with each
> other
>   Thanks
>        Harry

Just a quick question, and to me an obvious point Harry, are you aware
of rs-485?
good for 3000 metres.

Cheers Don...

-- 
Don McKenzie  E-mail:    http://www.dontronics.com/e-mail.html
              Home Page: http://www.dontronics.com

Add USB to your favorite Micro.      http://www.dontronics.com/dlp.html
The World's Largest Range of Atmel/AVR & PICmicro Hardware and Software

----- Original Message ----- 
From: "Harry Pfeifer" <hpfeifer@d...>
To: "Simstick forum" <simmstick@yahoogroups.com>
Sent: Saturday, June 28, 2003 12:50 PM
Subject: [simmstick] PIC serial I/O over balanced lines


> I am working on a PIC based control system project which requires 16 bits
of
> serial date to be sent and received  over 1000 metres of cable. There may
be
> up to 10 systems connected along the cable and any one of  them may
transmit
> and the others will receive it.
>
> Because of the distance involved, it is necessary to transfer the data as
an
> audio tone over a balanced 2 wire circuit
>
> I have already resolved the issues of handshaking etc. and have designed a
> system using DTMF encoders and receivers, which sends 4 words of 4 bits
> each. Unfortunately its implementation  requires  too many  PIC I/O pins,
> and it seems a more practicable method to use the asynchronous port which
is
> already implemented on many microcontrollers. Data could be  generated  in
> RS232 format at 300 baud ,converted to an audio tone to be sent over the
> cable and then converted back to RS232 at the receiving end.
>
> I know that there are modem chips which will do this but they are likely
to
> be quite expensive, and probably require a lot of I/O pins from the
> microcontroller
>
> I am hoping that someone out there can suggest a simple and inexpensive
> method of generating and decoding the audio tones, which has the necessary
> frequency accuracy so that all ten systems can stay in tune with each
other
>   Thanks
>        Harry
>

Looked at Can ?
Up to 64 controllers on the same bus.
http://www.semiconductors.philips.com/buses/can/

microchip make can ic's
http://www.microchip.com/1010/pline/analog/anicateg/interface/can/index.htm

Don sells some can products
Don sells some can stuff http://www.dontronics.com/candip.html

futurlec has a cheapish can kit.
http://www.futurlec.com/CANNode.shtml
I've built a few of these and they are quite easy to get going.

or I2C  a lot of pics have it builtin.
http://www.microchip.com/1010/pline/picmicro/category/embctrl/8kbytes/index.htm
http://www.microchip.com/1010/pline/picmicro/category/embctrl/14kbytes/index.htm
http://www.microchip.com/1010/pline/picmicro/category/embctrl/32kbytes/index.htm

http://www.semiconductors.philips.com/buses/i2c/
http://www.ping.be/~ping0751/i2cfaq/i2cproto.htm
http://www.whatis.com/definition/0,,sid9_gci537791,00.html

Couldn't you do the synching using a 32KHz or lower crystal ?
Have a crystal at each micro.

Alex

There is i2c demo code on the microchip web site for 18xxx pics
http://www.microchip.com/1010/suppdoc/appnote/codxamp/index.htm

i2c app notes
http://www.microchip.com/1010/suppdoc/appnote/func/commun/i2c/index.htm

can app notes
http://www.microchip.com/1010/suppdoc/appnote/func/connect/can/index.htm

others for
spi  http://www.microchip.com/1010/suppdoc/appnote/func/commun/spi/index.htm

listing by function
http://www.microchip.com/1010/suppdoc/appnote/func/index.htm
all app notes http://www.microchip.com/1010/suppdoc/appnote/alpha/index.htm



on the mcp2510 can controller
http://www.microchip.com/1010/suppdoc/appnote/all/an739/index.htm

mcp connects to micros via spi

smart sensors using mcp2510 and 16fx876
http://www.microchip.com/1010/suppdoc/appnote/all/an212/index.htm


Alex

Alex Gibson wrote:
> 
> There is i2c demo code on the microchip web site for 18xxx pics
> http://www.microchip.com/1010/suppdoc/appnote/codxamp/index.htm

You never cease to amaze me with your wide diversification of knowledge,
and the number of links you are able to pluck out of your head Alex.

Must be spending more time researching on the net than I do. 

I hope you are recording it all on your web page. :-)

Don...

-- 
Don McKenzie  E-mail:    http://www.dontronics.com/e-mail.html
              Home Page: http://www.dontronics.com

Add USB to your favorite Micro.      http://www.dontronics.com/dlp.html
The World's Largest Range of Atmel/AVR & PICmicro Hardware and Software

----- Original Message ----- 
From: "Don McKenzie" <simmstick_member@d...>
To: <simmstick@yahoogroups.com>
Sent: Saturday, June 28, 2003 5:17 PM
Subject: Re: [simmstick] PIC serial I/O over balanced lines


> Alex Gibson wrote:
> >
> > There is i2c demo code on the microchip web site for 18xxx pics
> > http://www.microchip.com/1010/suppdoc/appnote/codxamp/index.htm
>
> You never cease to amaze me with your wide diversification of knowledge,
> and the number of links you are able to pluck out of your head Alex.
>
> Must be spending more time researching on the net than I do.
>
> I hope you are recording it all on your web page. :-)
>
> Don...

usually keep a list of the links.
Haven't touched my webpage is a year or more.

With what I've been up to lately , need to get up to speed with things
quickly.

Also been tutoring a subject at uni so need to
keep an eye out on resources and also if your going to set
an assignment that there is nothing out there that is identical.

Having to work out assignments for next semester at the moment.
(subject coordinator doesn't know pics, microcontrollers or digital logic)

Board we are using (designed at uni) has
16f628, xilinx xl9572xc, max232,2xdual seven segment displays driven via
uln2003, 8 dip switch
speaker driven via op amp, 8 pushbutton switches,18 leds(was 12),db9 serial
connector
12fxxx pic for use as a programmable oscillator, 20MHz crystal.
mounted on perspex. ports on the pic, cpld,leds, ssg
all connected via jumper links.

designed(not by me) so is nearly impossible to blow them up.
main hassle is bad soldering as the students have to buy them as kits
and assemble them.

Separate programmer board, switch / jumper selectable between pics and cpld.
connects via  connectors.

Hopefully next year will go back to being a one
piece board.
Programmers were provided for the students who didn't want to
buy them. Had major  hassles with the programmers getting
sabotaged. connecting cable getting cut, fuse holders and fuses getting
knocked off.
parallel cable to programmers getting cut.

Looking at having 5 or 6 assignments.
2 pic , 2 cpld and at least one big combined one.

For the pic

dual or 4 channel voltmeter which has to display on
a pc via rs232, in hyperterminal or if I get the time
in a small vb app.and on seven segment display

seven segment driving with the pic

frequency counter - up to maybe 10MHz

simple function generator - sine and square waves 0 to 20KHz(maybe higher)

simple electronic piano. enter play notes via buttons
or via pc . also enter a simple tune, then have it play it back.
have a minimum amount of notes set.

digital clock with alarm(via speaker)

count up / down timer

electronic dice

lover tester / skin resistance meter

pic interface

sound player - depending on buttons pressed plays different sounds

cpld(using schematics, not my choice but there is another subject that
teaches vhdl and computer architecture)

keypad interface using the buttons on the board

simple calculator using the keypad interface(4 or 8 bit)
and pic(for rs232 to pc)  +, -, *, /  , square root, squared,
displays on seven segment and on pc.
some inputs via pc others via the buttons

hex calculator
bcd calculator

binary to hex converter - enter via buttons(display entered number on leds)
then convert and display on seven segment display

frequency counter

timer - up , down , presetable,

morse code - encoder or decoder

master slave light dimmer. with master and minimum two slaves on the same
cpld.
uses wire link.


I also have to come up with sample solutions using schematics
(can't cheat and use vhdl and make schematic modules unfortunately :-(  )

Any suggestions greatly appreciated.

Alex

----- Original Message ----- 
From: <henri@q...>
To: <simmstick@yahoogroups.com>
Sent: Sunday, June 29, 2003 1:59 AM
Subject: Re: [simmstick] PIC serial I/O over balanced lines


>
> where do i sign up ?
>
> :)
>
> henri

www.uts.edu.au
 subject is ids - Introductory digital systems.
http://www.uts.edu.au/div/publications/subjects/48441.html

I'm only tutoring.

New lecturer for the hardware part is a bit hard to understand
(very strong accent)


otherwise

Logic and Computer Design Fundamentals by Mano and Kime

Digital design : Princibles and Practices by Wakerly

download

xilinx webpack from www.xilinx.com

the coolrunner2 design kits are nice. but the same board is available from
digilentinc.com
with breadboard and expansion connector.

or search for Leon Heller's cpld simstick.
a board using a xilinx xl9572xc (pc44) would be cheaper as the cplds are
only US$2

mplab from www.microchip.com


references(from this semesters subject guide not by me)
Textbook

There is no recommended textbook for the concurrent programming stream, but
there is a textbook that supports
some aspects of the digital design stream, namely:

Logic and Computer Design Fundamentals. 2nd Edition Updated with Xilinx
4.2i, M. Morris Mano and
Charles R. Kime, Prentice Hall, 2001, ISBN 0-13-031486-2 (available from the
Co-Op). Library's Call Number:
621.395 MANO (2001.ED)

References (in chronological order)

A) Digital Design Stream

A.1) PIC resources

http://www.microchip.com

http://www.piclist.com
(The PICList is a collection of people interested in the Microchip PIC and
other similar
processors)

Myke Predko's Reference Page (http://www.myke.com)

Programming and Customizing PICmicro® Microcontrollers, 2nd Edition, Myke
Predko, McGraw-Hill, 2002,
ISBN 0-07-136172-3 (highly recommended) ). Library's Call Number: 629.89
PRED (ED.2)

PIC in Practice, D.W. Smith, Newnes, 2002, ISBN 0-7506-4812-0 (Even though
this book mainly focuses on
PIC microprocessors used in previous semesters, it still provides useful
information)

PICmicro® Microcontroller Pocket Reference, Myke Predko, McGraw-Hill, 2001,
ISBN 0-07-136175-8
(highly recommended). Library's Call Number: 629.895 PREK

Design with PIC Microcontrollers, John B. Peatman, Prentice Hall, 1997, ISBN
0-13-759259-0 (Even though
this book focuses on PIC microprocessors used in previous semesters, it
still provides useful information).
Library's Call Number: 629.89 PEAT

CPLD resources
http://www.xilinx.com
Prentice Hall's Xilinx Student Edition Labs and Tutorials
(http://www.prenhall.com/xilinx)

Xilinx University Program (http://university.xilinx.com)

Xilinx University Resource Center (http://www.xup.msu.edu)

Digital Logic Simulation with CPLD Programming, 2nd Edition, Steve Waterman,
Prentice Hall, 2003, ISBN
0-13-046711-1 (Even though this book focuses on CPLDs manufactured by Altera
Corporation it still provides
useful information on practical setups)

Digital Fundamentals, 8th Edition, Thomas L. Floyd, Prentice Hall, 2003,
ISBN 0-13-046411-2 (This book
covers fixed-function logic devices and programmable logic devices (PLDs).
It uses the ADEL hardware
description language to program the PLDs). Library's Call Number: 621.3815
FLOY (ED.8)

Digital Fundamentals with VHDL, Thomas L. Floyd, Prentice Hall, 2003, ISBN
0-13-099527-4 (PLDs are
presented as the predominant method of logic function implementation. VHDL
is introduced as the hardware
description language of choice for programming PLDs)

Digital Electronics. A Practical Approach, 6th Edition, William Kleitz,
Prentice Hall, 2002, ISBN 0-13-
099629-2 (CPLDs problems are included at the end of several chapters.
Appendix E contains a very good tutorial
for using Xilinx Foundation Series software). Library's Call Number:
621.381/308 (ED.6)

Digital Electronics with PLD Integration, Nigel P. Cook, Prentice Hall,
2001, ISBN 0-13-086907-4 (Appendix
A contains a tutorial on using hardware design languages (HDLs) with Xilinx
tools. Chapter 4 also includes a
section on how to use Xilinx Foundation Series software) ). Library's Call
Number:

Digital Electronics Laboratory Experiments Using the Xilinx® XC95108TM CPLD
with Xilinx®
FoundationTM Design and Simulation Software, James W. Stewart and Chao-Ying
Wang, Prentice Hall, 2001,
ISBN 0-13-088192-9 (This book provides a step-by-step introduction to Xilinx
Foundation Series software),
Library's Call Number: 621.381 STEW


 Digital Design Fundamentals and Computer Organization Resources
Fundamentals of Digital Logic with Verilog Design, Stephen Brown and Zvonko
Vranesic, McGraw-Hill,
2003, ISBN 0-07-282315-1 (The book concentrates on CPLDs and
field-programmable gate arrays (FPGAs). The
CAD support is based on Altera MAX+plusII software)



Digital Principles and Design, Donald D. Givone, McGraw-Hill, 2003, ISBN
0-07-252503-7 (This book focuses
on the traditional approach to logic design, i.e., the emphasis is not on
programmable devices) Library's Call
Number: 621.395 WAKE (2002.ED)

Digital Design: Principles and Practices and Xilinx 4.2i Student Package,
3rd Edition, John F. Wakerly,
Prentice Hall, 2002, ISBN 0-13-176059-9 (This was the textbook we used in
the Autumn 2001 semester)
Computer Organization, 5th Edition, Carl Hamacher, Zvonko Vranesic and
Safwat Zaky, McGraw-Hill, 2002,
ISBN 0-07-112218-4 (This book presents hardware design principles dealing
with issues related to processors,
I/O, memory, peripherals, and communication links) Library's Call Number:
004.22 HAMA (ED.5)

Digital Design, 3rd Edition, M. Morris Mano, Prentice Hall, 2002, ISBN
0-13-035525-9 (The presentation is at a
suitable level for beginning students that are learning digital circuits and
a hardware description language at the
same time)

Digital Design Essentials, Richard S. Sandige, Prentice Hall, 2002, ISBN
0-201-47689-4 (The book covers
classical hardware design of combinational and sequential logic circuits
combined with the use of modern CAD
tools, including the Xilinx Foundation Series software) Library's Call
Number: tbc

Digital Electronics Guidebook with Projects!, Myke Predko, McGraw-Hill,
2002, ISBN 0-07-137781-6 (For
those who want to update their knowledge of digital electronics through
practical projects) Library's Call
Number: 621.381 PRED

Digital Electronics. A Simplified Approach, Robert D. Thompson, Prentice
Hall, 2001, ISBN 0-13-505694-2
(This books presents the prerequisite material for advanced
microprocessor/microcomputer courses. It encourages
a developmental approach to learning)

A.4) Further Reading
Embedded Design with the PIC18F452 Microcontroller, John B. Peatman,
Prentice Hall, 2003, ISBN 0-13-
046213-6 (This book focuses on Microchip Technology's PIC18FXXX family, and
its newest member, the
PIC18F452)

B) Concurrent Programming Stream

B.1) Real-time Systems Resources

Software Engineering for Real-Time Systems, Jim Cooling, Addison-Wesley,
2003, ISBN 0-202-59620-2
(This book sets out to provide a firm foundation in the knowledge and skills
needed to develop and produce realtime
embedded systems)

Scheduling in Real-Time Systems, Francis Cottet, Joëlle Delacroix, Claude
Kaiser, and Zoubir Mammeri, John
Wiley & Sons, 2002, ISBN: 0470847662 (This book examines the most
significant real-time scheduling policies
in use today) Library's Call Number: 004.33 COTT

Real-Time Systems: Scheduling, Analysis, and Verification, Albert M. K.
Cheng, John Wiley & Sons, 2002,
ISBN: 0471184063 (This book provides a guide to testing, analysing,
verifying, and monitoring real-time
systems) Library's Call Number: 658.4038 CHEN

Embedded Microprocessor Systems: Real World Design, 3rd Edition, Stuart R.
Ball, Newnes, 2002, ISBN 0-
7506-7534-9 (This book provides a step-by-step review of the procedures
involved in designing embedded
control systems)

Fundamentals of Embedded Software: Where C and Assembly Meet, Daniel W.
Lewis, Prentice Hall, 2002,
ISBN 0-13-061589-7 (Using an embedded software context, this book introduces
multi-threaded programming,
pre-emptive and non-preemptive systems, shared resources and scheduling)

Real-time Systems and Software, Alan C. Shaw, John Wiley & Sons, 2001, ISBN
0-471-35490-2 (This book
covers software architectures, informal and formal specification methods,
deterministic scheduling, execution
time analysis, computer clocks and time-services, real-time programming
languages, and operating systems)
Library's Call Number: 004.33 SHAW

Real-time Computer Control: An Introduction. 2nd Edition, Stuart Bennett,
Prentice Hall, 1994, ISBN 0-13-
764176-1 (This book deals with techniques relating to the use of embedded
computers in complex engineering
systems) Library's Call Number: 629.89 BENN (ED.2)

B.2) Operating Systems Resources

Operating Systems Principles, Lubomir F. Bic and Alan C. Shaw, Prentice
Hall, 2003, ISBN 0-13-026611-6
(This book integrates those fundamental ideas, principles and concepts that
remain constant in both centralized
and distributed computing)

Operating Systems. A Modern Perspective, 2nd Edition, Lab Update, Gary Nutt,
Addison-Wesley, 2002, ISBn
0-201-74196-2 (This book features a complete discussion of operating systems
principles, supplemented with
code, algorithms, implementation issues, and lab exercises)

Modern Operating Systems. 2nd Edition, Andrew Tanenbaum, Prentice Hall,
2001, ISBN 0-13-092641-8 (One
of the best sellers in the field of operating systems) Library's Call
Number: 005.43 TANE (ED.2)

Operating Systems. 4th Edition, William Stallings, Prentice Hall, 2001, ISBN
0-13-032986-6 (One of the best
sellers in the field of operating systems) Library's Call Number: 005.43
STAL (ED.4)

Operating System Design. Volume I. The XINU Approach. PC Edition, Douglas
Comer and Timothy
Fossum, Prentice Hall, 1988, ISBN 0-13-638180-4 (This book deals with the
operating system that we will be
experimenting with in the concurrency stream) Library's Call Number: 005.43
COME [1]

B.3) Further Reading

Petri Nets for Systems Engineering. A Guide to Modeling, Verification, and
Applications, Claude Girault
and Rudiger Valk (Editors), Springer, 2003, ISBN 3-540-41217-4 (This book
illustrates recent progress made in
formal methods for the specification and verification of hardware and
software systems)

Real-Time Systems, Jane W.S. Liu, Prentice Hall, 2000, ISBN 0-13-099651-3
(This is an advanced text which
provides a comprehensive treatment of real-time computing and communication
systems)

29-Jun-2003 

GenerExe's XPad is a Visual IDE for realtime programming, simulation and
compilation for Microchip PIC12F675/629, PIC6F84, PIC 16F628, Atmel
AT89CX051, Philips 87LPC76X, Motorola 68HC11 68K-based, and PalmOs
Devices. 
http://www.dontronics.com/generexe.html 

-- 
Don McKenzie  E-mail:    http://www.dontronics.com/e-mail.html
              Home Page: http://www.dontronics.com

Add USB to your favorite Micro.      http://www.dontronics.com/dlp.html
The World's Largest Range of Atmel/AVR & PICmicro Hardware and Software

These girls have seen more ceiling than Michelangelo, but they've always taken it in the snatch.
Check out these first time anal amateurs at 

http://www.CasualSexAds.net/landing.asp?afl=ZYHO

Free Trial

monkeypunchme4 wrote:
> 
> These girls have seen more ceiling than Michelangelo, but they've
> always taken it in the snatch.
> Check out these first time anal amateurs at

hard to believe but these people goto the trouble of subscribing to
yahoo groups, just so they can send one spam message.

user manually removed.

Cheers Don...

-- 
Don McKenzie  E-mail:    http://www.dontronics.com/e-mail.html
              Home Page: http://www.dontronics.com

Add USB to your favorite Micro.      http://www.dontronics.com/dlp.html
The World's Largest Range of Atmel/AVR & PICmicro Hardware and Software

Yep,
Thay've probably automated that bit too.
I often wonder whether it does them any good, It must or they wouldn't bother,
either that or they are just being nuisances!
Cheers

Don McKenzie wrote:

> monkeypunchme4 wrote:
> >
> > These girls have seen more ceiling than Michelangelo, but they've
> > always taken it in the snatch.
> > Check out these first time anal amateurs at
>
> hard to believe but these people goto the trouble of subscribing to
> yahoo groups, just so they can send one spam message.
>
> user manually removed.
>
> Cheers Don...
>
> --
> Don McKenzie  E-mail:    http://www.dontronics.com/e-mail.html
>               Home Page: http://www.dontronics.com
>
> Add USB to your favorite Micro.      http://www.dontronics.com/dlp.html
> The World's Largest Range of Atmel/AVR & PICmicro Hardware and Software
>
>
> To Post a message, send it to:   simmstick@e...
>
> To Unsubscribe, send a blank message to: simmstick-unsubscribe@e...
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/

--
Leon Blakeley
CFA Communications
Ph (03) 92628400
Fax  (03) 92628383

PO Box 701
Mt. Waverley
3149

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http://www.MillionaireMatch.com/i/4

Hi, there,

I am looking for the schematics of SIMMStick PIC002. Anybody can send 
me one?
The links for pic002 at Dontronics are broken. I cannot find a pdf or 
the schematics files there.
Your help will be highly appreciated.

Lin

zhao47803 wrote:
> 
> Hi, there,
> 
> I am looking for the schematics of SIMMStick PIC002. Anybody can send
> me one?
> The links for pic002 at Dontronics are broken. I cannot find a pdf or
> the schematics files there.
> Your help will be highly appreciated.


good heavens, that was a long time ago :-)

try:
http://www.dontronics.com/pic002.html
I found the file, and linked

Don...



-- 
Don McKenzie  E-mail:    http://www.dontronics.com/e-mail.html
              Home Page: http://www.dontronics.com

Add USB to your favorite Micro.      http://www.dontronics.com/dlp.html
The World's Largest Range of Atmel/AVR & PICmicro Hardware and Software

Got it! Thanks, Don.

Lin

--- In simmstick@yahoogroups.com, Don McKenzie 
<simmstick_member@d...> wrote:
> zhao47803 wrote:
> > 
> > Hi, there,
> > 
> > I am looking for the schematics of SIMMStick PIC002. Anybody can 
send
> > me one?
> > The links for pic002 at Dontronics are broken. I cannot find a 
pdf or
> > the schematics files there.
> > Your help will be highly appreciated.
> 
> 
> good heavens, that was a long time ago :-)
> 
> try:
> http://www.dontronics.com/pic002.html
> I found the file, and linked
> 
> Don...
> 
> 
> 
> -- 
> Don McKenzie  E-mail:    http://www.dontronics.com/e-mail.html
>               Home Page: http://www.dontronics.com
> 
> Add USB to your favorite Micro.      
http://www.dontronics.com/dlp.html
> The World's Largest Range of Atmel/AVR & PICmicro Hardware and 
Software

The BasicX is close to a Visual Basic Stamp.
Check out their Yahoo group at 'basicx'.

--- In simmstick@yahoogroups.com, "Jeremy Proffitt" <rebeltech@c...> 
wrote:
> Java.  Ugh!  I could never understand it - I'm still waiting for the
> Visual Basic Stamp! :)
> 
> I do however like the proto boards, I think with the connections on 
the
> ends they are a little better than the dontronics boards I am using
> currently.
> 
> Cheers
> Jeremy
> 
> -----Original Message-----
> From: D. Jay Newman [mailto:jay@s...] 
> Sent: Monday, June 16, 2003 12:47 PM
> To: simmstick@yahoogroups.com
> Subject: Re: [simmstick] Re: STAMP - there are a lot of others, not 
just
> BASIC
> 
> From Bruce:
> 
> > We produce the 32-bit JStamp(r) which executes native Java (3x10e6
> byte 
> > codes per second) and has 512 KBytes SRAM and up to 2048 KBytes 
flash:
> 
> > http://www.jstamp.com  This is the most powerful stamp-sized 
module,
> with a 
> > "real" (open, standardized and full-featured) language on it. For
> example 
> > it includes threading, multiple data types including floating 
point,
> SPI 
> > hardware (over 1 Mbit), I2C, and dual UARTs (real hardware UARTs, 
not 
> > bit-banged UAR or UAT) at 115 kbaud. Perhaps amazingly, because 
it is
> much 
> > newer technology, JStamp actually uses *less* power than the BASIC
> Stamp.
> 
> I use and *like* this product. My current experimental robot uses 
the
> JStamp.
> 
> ...
> 
> > We also have a new module - JStik - which executes 15-20 million 
Java
> byte 
> > codes per second: http://www.jstik.com and it has a high speed 
I/O bus
> 
> > which can transfer a byte of data faster than every 20 nsec. This 
bus
> is 
> > intended for streaming video/audio, high speed ADC and DAC etc. 
This
> is by 
> > far the most powerful SimmStick-compatible processor available, 
as far
> as 
> > we know.
> 
> I *love* this one, but I munged my backplane power supply, so it's 
in
> the shop for now.
> 
> Just a satisfied customer.
> 
> Though I *really* want them to put an Ajile 100 (the processor for 
the
> JStik)
> on a "stamp" with *lots* of RAM. Essentially I want a Java neural 
net
> machine in a very small package.
> 
> Have a nice day!
> -- 
> D. Jay Newman          ! 
> jay@s...    ! Xander: Giles, don't make cave-slayer unhappy.
> http://enerd.ws/~jay/  ! 
> 
> 
> To Post a message, send it to:   simmstick@e...
> 
> To Unsubscribe, send a blank message to:
> simmstick-unsubscribe@e... 
> 
> Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/

Wow, this thread went all over the place.

I highly recommend using RS485 (example: chip SN75176)
for this purpose.  Each segment is good to 
4,000 feet at 100 KBits/Sec, and there are 
commercially available repeaters which can
extend the distance.

On a 4,000 foot cable, you're allowed 32 
drivers and receivers in a 'party-line'
configuration.

With a three-wire interface (A, B, and GND)
and some collision detection software, you
should be able to put together a 
multiple-master net which will work reliably
at 19,200 baud or higher.  RS485 works very
well with RS232 UARTS and protocols -- 
it just provides a longer run, more noise
resistance, more connected drivers and 
receivers than the 232 drivers do.

See:
http://www.melabs.com/resources/links.htm 
and scroll down to their RS485 section.
I particularly like 
"Ten ways to bulletproof RS485" and
"The practical limits of RS485".

--- In simmstick@yahoogroups.com, "Harry Pfeifer" <hpfeifer@d...> 
wrote:
> I am working on a PIC based control system project which requires 
16 bits of
> serial date to be sent and received  over 1000 metres of cable. 
There may be
> up to 10 systems connected along the cable and any one of  them may 
transmit
> and the others will receive it.
> 
> Because of the distance involved, it is necessary to transfer the 
data as an
> audio tone over a balanced 2 wire circuit
> 
> I have already resolved the issues of handshaking etc. and have 
designed a
> system using DTMF encoders and receivers, which sends 4 words of 4 
bits
> each. Unfortunately its implementation  requires  too many  PIC I/O 
pins,
> and it seems a more practicable method to use the asynchronous port 
which is
> already implemented on many microcontrollers. Data could be  
generated  in
> RS232 format at 300 baud ,converted to an audio tone to be sent 
over the
> cable and then converted back to RS232 at the receiving end.
> 
> I know that there are modem chips which will do this but they are 
likely  to
> be quite expensive, and probably require a lot of I/O pins from the
> microcontroller
> 
> I am hoping that someone out there can suggest a simple and 
inexpensive
> method of generating and decoding the audio tones, which has the 
necessary
> frequency accuracy so that all ten systems can stay in tune with 
each other
>   Thanks
>        Harry

15-Jul-2003 
Micro Processor based ETHERNET Controlled Web Server. NEW Model, New
Features: PRONIC15.  Connect to any Micro Processor to give ethernet
connectivity, Stand alone Web Server, Factory Automation Data Gathering,
Remote control, Factory Floor Machine monitoring, Home Electronic /
Hobby Projects, Security Systems. 32k nonvolatile memory, send email. 
http://www.dontronics.com/projecsystems.html 

-- 
Don McKenzie  E-mail:    http://www.dontronics.com/e-mail.html
              Home Page: http://www.dontronics.com

Add USB to your favorite Micro.      http://www.dontronics.com/dlp.html
The World's Largest Range of Atmel/AVR & PICmicro Hardware and Software

--- In simmstick@yahoogroups.com, Liam O'Hagan <liam@g...> wrote:
> 
> I'm looking at getting a bunch of PCB's made. They'll be about 1/2 
as
> complex as the DT006. Does anyone know approximately how much this 
would
> cost for an initial run of 20 or 50 or so PCBs? 
> 
> Any recommendations for a good place to get them made?
> 
> Thanks
> 

Liam/Caff,
  While you've probably found what you need already, I generally get 
PCB's manufactured in panels and cut apart for about $3-400 for a bit 
under an A3 sheet's worth, with about another 150-200 for an 
additional sheet, starting with a Protel file.  If you need supplier 
details, send me an e-mail.

Cheers,
Alf Katz
www.micromagic.net.au

Hi All,

I've been using a DT006 quite successfully for some time, and notice that
the programming circuit is very much in the style of the Simple Programmer,
and just uses 3 resistors in series with the SPI port on the MCU's.

I am looking at building a circuit on another board and still allowing an
ISP facility. My question is this:

Most of the ISP Programmers I have looked at recently use a buffer /
transceiver, is this provided just to add some protection to the parallel
port of the PC or does it serve some other purpose?

Regards,
Paul Howard

----- Original Message ----- 
From: "Paul Howard" <paulh@a...>
To: <simmstick@yahoogroups.com>
Sent: Saturday, July 19, 2003 11:17 PM
Subject: [simmstick] ISP Programmers


> Hi All,
> 
> I've been using a DT006 quite successfully for some time, and notice that
> the programming circuit is very much in the style of the Simple Programmer,
> and just uses 3 resistors in series with the SPI port on the MCU's.
> 
> I am looking at building a circuit on another board and still allowing an
> ISP facility. My question is this:
> 
> Most of the ISP Programmers I have looked at recently use a buffer /
> transceiver, is this provided just to add some protection to the parallel
> port of the PC or does it serve some other purpose?
> 
> Regards,
> Paul Howard

Provides protection and can also help if you are getting noise on the line
(use schimdt trigger).
Should also have a diode or two for protection for voltages going either way
(back to computer or into circuit).

Using schimdt triggering also allows longer cable lengths.

http://www.lancos.com/prog.html  scroll down

http://www.myplace.nu/avr/yaap/
http://www.myplace.nu/avr/yaap/if_jesper.gif

also see the atmel app note  AVR910 
http://www.atmel.com/dyn/products/app_notes.asp?family_id=607
http://www.atmel.com/dyn/resources/prod_documents/DOC0943.PDF
http://www.atmel.com/dyn/resources/prod_documents/AVR910.ASM


Alex

Does anyone know where I can get hold of some 8 pin PLCC sockets?

Apparently Enplas (http://www.enplas.co.jp/english/index.htm) make them but
I could find no reference to anything smaller than 20 pin on their
website... I'm still waiting for them to get back to me.

Any ideas??

Not exactly,
     Haven't seen anything locally under 20 pins.  I take it this is for
your recently replaced sensor?  I'd glue the thing down (so it doesn't move
around spoiling your readings) in the dead bug position to an 8 or 14 way
DIL header (e.g. Farnel 176-760), solder some fine wire wrap (or enamelled
Cu) wire between IC pins and socket pins, possibly slap a cover over it,
instant DIP equivalent.
Cheers,
Alf Katz
alfkatz@i...
www.micromagic.net.au
(03) 9781 2341
Mob. 0419 898 834

----- Original Message -----
From: "Liam O'Hagan" <liam@g...>
To: <simmstick@yahoogroups.com>
Sent: Wednesday, July 23, 2003 10:49 AM
Subject: [simmstick] 8 Pin PLCC sockets


> Does anyone know where I can get hold of some 8 pin PLCC sockets?
>
> Apparently Enplas (http://www.enplas.co.jp/english/index.htm) make them
but
> I could find no reference to anything smaller than 20 pin on their
> website... I'm still waiting for them to get back to me.
>
> Any ideas??
>
>
> To Post a message, send it to:   simmstick@e...
>
> To Unsubscribe, send a blank message to: simmstick-unsubscribe@e...
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>

Thanks to everyone who responded to my question a few weeks ago re serial
communication over balanced lines, and  a special thank you  to those who
suggested RS485 which was very attractive, but unfortunately the drivers
have a relatively low common mode voltage rating of 12 volts.

I have chosen to use V23 which generates  voice frequency tones that can be
passed through a line isolating transformer, which will protect the PIC
against damage caused by accidental cross connection (eg if the cable gets
damaged)  with other circuits operating at 30 volts DC which share the same
cable.  (With RS485 to 10 nodes there could be 10 driver chips to replace if
this happened )

I have obtained code for PIC generation of  the pure sinewave tones for
transmission, but if anyone can direct me to a source of code for PIC based
demodulation of the V23 tones at the receiving end it,  would be greatly
appreciated .

Thank you again
Harry Pfeifer

I'm experimenting with C and I can't seem to find any codes to get 
the LED to flash on the DT006. The LEDs on the DT006 flashed 
perfectly fine with basic via Bascom. So will someone be kind enough 
to post or direct me to a site where I can view some C codes and get 
it to interact with the LEDs on the DT006. Thanks in advance!  

Cheers,
Charles

> I'm experimenting with C and I can't seem to find any codes to get
> the LED to flash on the DT006. The LEDs on the DT006 flashed
> perfectly fine with basic via Bascom. So will someone be kind enough
> to post or direct me to a site where I can view some C codes and get
> it to interact with the LEDs on the DT006. Thanks in advance!

What chip are you using on the DT006? I have a 2313, 8535, Mega8

What C Compiler do you want to use? I have been using the free AVR-GCC
compiler that is available on Windows in the WinAvr bundle. The main
SourceForge Project is here: http://sourceforge.net/projects/winavr and you
can download the latest software by scrolling down the page. I'm using the
20030424 version.

What programmer are you using? I have been using BASCOM/AVR, PonyProg,
avrdude and uisp, but I'm hoping to only use avrdude in the future as it
comes with the WinAvr bundle. However there has been a problem with avrdude
on windows that we have been working through and hopefully we have resolved
it in the last few days.

Tell us a bit more about what you want to achieve and maybe we can be of
more help.

Cheers

Alex Shepherd

Sorry for not including more details regarding my issue. Anyhow, I'm 
using the DT006 with the 2313 uC and ImageCraft AVR for my 
compiler/programmer. 

I just started with C programming for the AVR and in my opinion 
source codes in C isn't as easily obtainable as it is in asm or basic 
and tutorials/HOWTO in C for the AVR is close to nonexistance. I have 
no immediate goals to achieve, but perhaps just to be fluent in C 
programming for the AVR. 

LEARN LEARN and LEARN! :)

Thanks!

Cheers,
Charles


--- In simmstick@yahoogroups.com, "Alex Shepherd" <ashepherd@w...> 
wrote:
> > I'm experimenting with C and I can't seem to find any codes to get
> > the LED to flash on the DT006. The LEDs on the DT006 flashed
> > perfectly fine with basic via Bascom. So will someone be kind 
enough
> > to post or direct me to a site where I can view some C codes and 
get
> > it to interact with the LEDs on the DT006. Thanks in advance!
> 
> What chip are you using on the DT006? I have a 2313, 8535, Mega8
> 
> What C Compiler do you want to use? I have been using the free AVR-
GCC
> compiler that is available on Windows in the WinAvr bundle. The main
> SourceForge Project is here: http://sourceforge.net/projects/winavr 
and you
> can download the latest software by scrolling down the page. I'm 
using the
> 20030424 version.
> 
> What programmer are you using? I have been using BASCOM/AVR, 
PonyProg,
> avrdude and uisp, but I'm hoping to only use avrdude in the future 
as it
> comes with the WinAvr bundle. However there has been a problem with 
avrdude
> on windows that we have been working through and hopefully we have 
resolved
> it in the last few days.
> 
> Tell us a bit more about what you want to achieve and maybe we can 
be of
> more help.
> 
> Cheers
> 
> Alex Shepherd

> Sorry for not including more details regarding my issue. Anyhow, I'm 
> using the DT006 with the 2313 uC and ImageCraft AVR for my 
> compiler/programmer. 

Hmmm... ImageCraft - carn't help you much there.

Cheers

Alex Shepherd

I am interested in in-circuit debugging, primarily with 40 pin 87x chips but
I am also working with 16F84's. Don McKenzie has directed me to information
on the Dontronics website (www.dontronics.com/icd.html)  on a debugger which
is sent from Brazil, which works with MPLAB.

Can any one suggest other options

Harry Pfeifer