Re: Thoughts on changing a remote RX and TX.

Gary Anderson (G)

Well in my eyes you been a great HELP.. Might not know everthing but
you have known what I require..

YEA!! Programming not my favourite either. Iam a systems Administrator
for 33 000 desktops running Windows, but the only programming I use in
VB to help with those long repeated tasks that need to be done.. Sorry
unable to help but hopefully one day I can.

GOODLUCK..
Gary

Show quoted text

-----Original Message-----
From: Stefan Trethan [mailto:stefan_trethan@...]
Sent: Sunday, April 11, 2004 6:05 PM
To: Electronics_101@...
Subject: Re: [Electronics_101] Thoughts on changing a remote RX and
TX.

On Sun, 11 Apr 2004 17:57:28 +0200, Gary Anderson (G)
<andersg@...> wrote:

Hi Stafan..

You seem to know it all.

well, i definitely don't...

I'm sittng here for 3 hours now trying to figure out how to write a
totally
simple verilog (like c) software for a cpld.

I have a counter (binary) and want to display it's contents on a 8
digit
7-segment
led display.

i can't use a simple case statement like they do in the examples
because
with
8 digits i would have 99999999 cases, which is too much for me to
write...

It must be real simple, i mean should be no big deal to convert binary
to
BCD and then BCD to
7 segment but somehow i'm really stuck.

did i ever mention i HATE programming?

I really like hardware much more, it is so simple, how can they ever
get
their brains
around a software as complicated as windows i wonder.....

well... going back to the damn verilog...
how did i get the impression i need a frequency counter anyway i
wonder...

ST

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Re: Thoughts on changing a remote RX and TX.

Anthony Toft

#9557

I'm sittng here for 3 hours now trying to figure out how to write a totally
simple verilog (like c) software for a cpld.

I have a counter (binary) and want to display it's contents on a 8 digit 
7-segment
led display.

i can't use a simple case statement like they do in the examples because 
with
8 digits i would have 99999999 cases, which is too much for me to write...Do you have integer and floating point math?

if so, divide by 10 into a float, subtract the integer part of the
result, multiply by 10 and you have the least significant digit all on
it's own...

Or... modulo 10 will give you the least significant digit, the you can
divide by 10 to move the digits down, kinda like (in C, displayed number
passed as an int in 'display') 

int working=display;

while(working < 0)
{
     digit=working % 10;

     /* display digit, from right to left */

    working /=10;
}


I am sure there is a lot less processor intensive ways of doing it, but
these are all I dreamt up on the spur of the moment...
 
-- 
Anthony Toft <toftat@...>

Re: Thoughts on changing a remote RX and TX.

Anthony Toft

#9556

I'm sittng here for 3 hours now trying to figure out how to write a totally
simple verilog (like c) software for a cpld.

I have a counter (binary) and want to display it's contents on a 8 digit 
7-segment
led display.

i can't use a simple case statement like they do in the examples because 
with
8 digits i would have 99999999 cases, which is too much for me to write...Do you have integer and floating point math?

if so, divide by 10 into a float, subtract the integer part of the
result, multiply by 10 and you have the least significant digit all on
it's own...

Or... modulo 10 will give you the least significant digit, the you can
divide by 10 to move the digits down, kinda like (in C, displayed number
passed as an int in 'display') 

int working=display;

while(working < 0)
{
     digit=working % 10;

     /* display digit, from right to left */

    working /=10;
}


I am sure there is a lot less processor intensive ways of doing it, but
these are all I dreamt up on the spur of the moment...
 
-- 
Anthony Toft <toftat@...>

Re: Thoughts on changing a remote RX and TX.

Anthony Toft

#9555

I'm sittng here for 3 hours now trying to figure out how to write a totally
simple verilog (like c) software for a cpld.

I have a counter (binary) and want to display it's contents on a 8 digit 
7-segment
led display.

i can't use a simple case statement like they do in the examples because 
with
8 digits i would have 99999999 cases, which is too much for me to write...Do you have integer and floating point math?

if so, divide by 10 into a float, subtract the integer part of the
result, multiply by 10 and you have the least significant digit all on
it's own...

Or... modulo 10 will give you the least significant digit, the you can
divide by 10 to move the digits down, kinda like (in C, displayed number
passed as an int in 'display') 

int working=display;

while(working < 0)
{
     digit=working % 10;

     /* display digit, from right to left */

    working /=10;
}


I am sure there is a lot less processor intensive ways of doing it, but
these are all I dreamt up on the spur of the moment...
 
-- 
Anthony Toft <toftat@...>

Re: Thoughts on changing a remote RX and TX.

Stefan Trethan

#9554

On Sun, 11 Apr 2004 17:57:28 +0200, Gary Anderson (G) <andersg@...> wrote:

Hi Stafan..

You seem to know it all.

well, i definitely don't...

I'm sittng here for 3 hours now trying to figure out how to write a totally
simple verilog (like c) software for a cpld.

I have a counter (binary) and want to display it's contents on a 8 digit 7-segment
led display.

i can't use a simple case statement like they do in the examples because with
8 digits i would have 99999999 cases, which is too much for me to write...

It must be real simple, i mean should be no big deal to convert binary to BCD and then BCD to
7 segment but somehow i'm really stuck.

did i ever mention i HATE programming?

I really like hardware much more, it is so simple, how can they ever get their brains
around a software as complicated as windows i wonder.....

well... going back to the damn verilog...
how did i get the impression i need a frequency counter anyway i wonder...

ST

Re: Thoughts on changing a remote RX and TX.

Gary Anderson (G)

#9553

Hi Stafan..

I cant believe you still studying.. Wot more can they teach you.. You
seem to know it all."Unless you doing cooking classes or something
totally not Electronic releated"
Damn if I were opening a business I would hire you without a thought.
Only problem would be then you would be too busy and no time to help
other like myself..

Iam getting there with my quest for a cheap wireless link.

HI Chris!!

Thanks
Gary

Show quoted text

-----Original Message-----
From: Stefan Trethan [mailto:stefan_trethan@...]
Sent: Sunday, April 11, 2004 5:49 PM
To: Electronics_101@...
Subject: Re: [Electronics_101] Thoughts on changing a remote RX and
TX.

On Sun, 11 Apr 2004 08:15:55 -0700, Chris <chris2003@...> wrote:

ST, You have 2 very good ideas, which in the past I thought about,And if
some one is willing I would like to continue it quote " You also canlook
out for RC remote controls (RC planes, cars, etc.)
I think it should be possible to feed a RS232 in there, and get itout
inside the RX.
I would know where to feed in in in my TX but not exactly where inthe RX
to find it.
I'm also not sure about the speed, you have to check the bitrates,RC
pulses are rather slow. " Could you elaborate on that, because Ihave
several remote control cars and trucks here that just need batteriesto
run,
Also this one is also a good option but takes a wile and MIGHT NOTWORK,
although I have seen ZERO!! schematics on remote control ( planescars
boats ) schematics out there, specifically 27 54 and such mhz!!

Thank you
please try to make the initial post and your answer distinguishable.
a common method is using > before each line of the old post.
Your mail software should be able to do this.
another common method would be to write before or after the message if

there
is no way to get the > but then you can not post "between the lines".
thank you.

The remote control i have uses a encoder IC for coding the
potentiometer
position into
a pwm chain, then feeds it into a hf stage. the receiver somehow must
get
the chain back,
but then it must seperate the pulses to the individual channels.

If you want to use a RC remote for this purpose please make sure you
annoy
no model
builders with it, it is not nice to have your plane crash because of
someone
printing something......
(check that the range is low enough and use a "odd" channel.

You are right, it might not work, but it micht be cheap and might
work.
i know nothing about the bandwidth of the transmitter, you might need
to
modify some
filters or so.

It is definitely much easier to use the ready to use modules from the
electronics suppliers,
the "useable" ones seem to cost around eur50.

ST

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Re: Thoughts on changing a remote RX and TX.

Stefan Trethan

#9551

On Sun, 11 Apr 2004 08:15:55 -0700, Chris <chris2003@...> wrote:

ST, You have 2 very good ideas, which in the past I thought about, And if
some one is willing I would like to continue it quote " You also can look
out for RC remote controls (RC planes, cars, etc.)
I think it should be possible to feed a RS232 in there, and get it out
inside the RX.
I would know where to feed in in in my TX but not exactly where in the RX
to find it.
I'm also not sure about the speed, you have to check the bitrates, RC
pulses are rather slow. " Could you elaborate on that, because I have
several remote control cars and trucks here that just need batteries to run,
Also this one is also a good option but takes a wile and MIGHT NOT WORK,
although I have seen ZERO!! schematics on remote control ( planes cars
boats ) schematics out there, specifically 27 54 and such mhz!!


Thank you
please try to make the initial post and your answer distinguishable.
a common method is using > before each line of the old post.
Your mail software should be able to do this.
another common method would be to write before or after the message if there
is no way to get the > but then you can not post "between the lines".
thank you.


The remote control i have uses a encoder IC for coding the potentiometer position into
a pwm chain, then feeds it into a hf stage. the receiver somehow must get the chain back,
but then it must seperate the pulses to the individual channels.

If you want to use a RC remote for this purpose please make sure you annoy no model
builders with it, it is not nice to have your plane crash because of someone
printing something......
(check that the range is low enough and use a "odd" channel.

You are right, it might not work, but it micht be cheap and might work.
i know nothing about the bandwidth of the transmitter, you might need to modify some
filters or so.

It is definitely much easier to use the ready to use modules from the electronics suppliers,
the "useable" ones seem to cost around eur50.


ST

Re: Thoughts on changing a remote RX and TX.

Gary Anderson (G)

#9552

Hi Barry..

Yea we pay for local calls.  Expensive during the day..
We pay per minute.. or part thereof.. Too expensive..

Thanks
Gary

Show quoted text

-----Original Message-----
From: Stefan Trethan [mailto:stefan_trethan@...]
Sent: Sunday, April 11, 2004 4:15 PM
To: Electronics_101@...
Subject: Re: [Electronics_101] Thoughts on changing a remote RX and
TX.

On Sun, 11 Apr 2004 07:00:14 -0700 (PDT), Barry Savage
<sofistic@...> wrote:

Hi Gary and All:

If you have a phone at each location, and you are using Windows, whynot
just use Virtual Private Network.

Barrymaybe because in some countries you have to pay for phone calls ;-)

ST

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Re: Twisted trio?

#9550

I doubt twisting will make much difference as your signals will be 
changing slowly and you have very short runs.

--- In Electronics_101@..., "upand_at_them" 
<upand_at_them@y...> wrote:
The two devices I planned on using this for are a LM335 temp sensor 
and a Motorola pressure sensor.  Nothing will be over 5V and my wires 
will be about 3 feet long.  Soldered and heat-shrink tubing at the 
device end and header connector at the other end.

Mike

--- In Electronics_101@..., "Roy J. Tellason" 
<rtellason@b...> wrote:
What kind of signal are you running,  and how is it interfaced at each end? 
How long of a run are you talking about?

Re: Thoughts on changing a remote RX and TX.

Stefan Trethan

#9549

On Sun, 11 Apr 2004 08:12:20 -0700, Chris <chris2003@...> wrote:

Shit, That's a pretty damn good idea!
Do you mind sharing the link for para to com port plz?

Thank you<>
<>

<>


These are specialized ics which may be hard to get,
i think it may even be "sticker labeled" programmable,
not even asic but i'm not sure.

I would encourage maiking this with a cpld or pic.

ST

Re: Thoughts on changing a remote RX and TX.

Chris

#9547

Stefan Hats down to you, good links!
WE NEED MORE !!!

Thank you

Show quoted text

----- Original Message ----- 
From: "Stefan Trethan" <stefan_trethan@...>
To: <Electronics_101@...>
Sent: Sunday, April 11, 2004 3:57 AM
Subject: Re: [Electronics_101] Thoughts on changing a remote RX and TX.

look here if you plan to build one:

<
en-Sender_Empfaenger_Modul_Set_433MHz.pdf>

<
ml-sender_empfaenger_modul_set_de-en-fr.pdf>

This is a very simple design, but very bad too.
2kHz they say is the bandwisth, maybe there are ways to increase.

they claim 30m is the range.

it costs 15eur at conrad.de, you can find pictures if you go to
www.conad.de
and enter 130428 at the top left field.

again, this is the lowest quality unit you will find.
but it is very cheap.

ST

Yahoo! Groups Links

Re: Thoughts on changing a remote RX and TX.

Chris

#9548

hahahaahha :P

Show quoted text

----- Original Message ----- 
From: "Stefan Trethan" <stefan_trethan@...>
To: <Electronics_101@...>
Sent: Sunday, April 11, 2004 7:14 AM
Subject: Re: [Electronics_101] Thoughts on changing a remote RX and TX.

On Sun, 11 Apr 2004 07:00:14 -0700 (PDT), Barry Savage
<sofistic@...> wrote:

Hi Gary and All:

If you have a phone at each location, and you are using Windows, why not
just use Virtual Private Network.

Barrymaybe because in some countries you have to pay for phone calls ;-)

ST

Yahoo! Groups Links

Re: Thoughts on changing a remote RX and TX.

Chris

#9546

ST, You have 2 very good ideas, which in the past I thought about, And if
some one is willing I would like to continue it quote " You also can look
out for RC remote controls (RC planes, cars, etc.)
I think it should be possible to feed a RS232 in there, and get it out
inside the RX.
I would know where to feed in in in my TX but not exactly where in the RX
to find it.
I'm also not sure about the speed, you have to check the bitrates, RC
pulses are rather slow. " Could you elaborate on that, because I have
several remote control cars and trucks here that just need batteries to run,
Also this one is also a good option but takes a wile and MIGHT NOT WORK,
although I have seen ZERO!! schematics on remote control ( planes cars
boats ) schematics out there, specifically 27 54 and such mhz!!


Thank you

Show quoted text

----- Original Message ----- 
From: "Stefan Trethan" <stefan_trethan@...>
To: <Electronics_101@...>
Sent: Sunday, April 11, 2004 3:43 AM
Subject: Re: [Electronics_101] Thoughts on changing a remote RX and TX.

OK, so no CB, and no wires allowed.

The garage door operating thingys are possible too high integrated to
feed a tx before the HF stage.
Do you need handshake (duplex transmission)?

Take apart such a garage door thing, but there are no guarantees.
in most units there is some "changing key" generating mechanism which
decides
what is to be sent, somewhere after that and before the HF stage you might
feed your
signal.

You also can look out for RC remote controls (RC planes, cars, etc.)
i think it should be possible to feed a RS232 in there, and get it out
inside the RX.
i would know where to feed in in in my TX but not exactly where in the RX
to find it.
I'm also not sure about the speed, you have to check the bitrates, RC
pulses are rather slow.

Last version would be to build a TX and RX from scratch, but that would be
hardest
to do and i'm not sure if you have the neccesary tools and skills (then
you wouldn't
ask i reckon).

Fot the garage door thing: keep in mind they are only designed for a short
range..
might not work throgh concrete etc.

Optical transmission is impossible too i guess (laser)

ST

On Sun, 11 Apr 2004 11:55:42 +0200, Gary Anderson (G)
<andersg@...> wrote:

Hi Stefan..

Opps sorry for spelling your name wrong in previous message.

Well CBs in this country are as dead as hens teeth. I still have a
Midland running but listening to a hiss is no longer fun. We don't
have a freq on 27Mhz for data. That would be illegal.

Iam sure I would be able to get a module posted to me but it a really
expensive solution noting the exchange rate R7 to 1 US dollar. Stange
enough we can buy parts cheaper than other countries. This leave me
with trying to use a cheap solution by trying to build a circuit or
use a device which is fairly cheap and made locally like the RX TX
units used for garage doors.
Also I have these at present and thought it would be nice to learn how
they work.

The reason I can run a wire is if it were possible it would have to
lie in the road. Iam trying to link two buildings without installed a
wireless network which will require another PC.  I have a need to be
able to print to another printer located on the other side of the
road.

Thanks for the ideas so far.

Gary

-----Original Message-----
From: Stefan Trethan [mailto:stefan_trethan@...]
Sent: Sunday, April 11, 2004 11:40 AM
To: Electronics_101@...
Subject: Re: [Electronics_101] Thoughts on changing a remote RX and
TX.

On Sun, 11 Apr 2004 11:08:10 +0200, Gary Anderson (G)
<andersg@...> wrote:

Hi All..

Any ideas on being able to change the remote control units we use to
open the garage door to be able to conver/use this circuit to TX and
RX a PCs COMS ports signal??

Thanks Stephan.. The web site you supplied has given to the capacity
to convert parallel to serial signal. Now I need to TX  this over a
distance of about 50m or more.

Any thoughts and ideas???

Thanks
Gary
Get a old CB (ham) radio, like the handheld units or the ones for car.
you can find them for next to nothing at ebay. there should be
channels for
data communication. there are also already modems available, and i am
sure
circuits
for making them. it would be the easy solution.

I could get such wireless modules here like described in the elektor,
where you just
connect rx and tx an that's it.
It would be the better solution, because you are not using CB
frequency
(not sure if this is legal)
and you have a much smaller unit, less power consumption etc.
I haven't followed the whole converstion, can't you get these modules
anywhere?
i would reckon ther must be vendors shiping to .za.
(you could try the german supplyers like reichelt or segor, ot the
austrian RS components
if you really have none locally. of course you can also try american
like
digikey which will
be cheaper.

I strongly oppose any wireless transmission if there is a posibility
to
run a wire.
especially if both rx and tx are stationary it is simply stupid to use
up
frequencys.

I dunno why you can't run a wire, but i would think twice.

st

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Re: Thoughts on changing a remote RX and TX.

Chris

#9545

开云体育

Shit, That's a pretty damn good idea!

Do you mind sharing the link for para to com port plz?

?

Thank you

?

Show quoted text

----- Original Message -----

From: Gary Anderson (G)

To: Electronics_101@...

Sent: Sunday, April 11, 2004 2:08 AM

Subject: [Electronics_101] Thoughts on changing a remote RX and TX.

Hi All..

?

Any ideas on being able to change the remote control units we use to open the garage door to be able to conver/use this circuit to TX and RX a PCs COMS ports signal??

?

Thanks Stephan.. The web site you supplied has given to the capacity to convert parallel to serial signal. Now I need to TX? this over a distance of about 50m or more.

?

?

Any thoughts and ideas???

?

Thanks

Gary

?

Re: A3977 Stepper driver (finally) updated.

Chris

#9544

开云体育

Yea, I looked at that schematic once, I was going to build it but I found an even better deal on ebay, 24V supplies are very common and cheap!

I would suggest cranking up the output amperage to the maximum, since you cant always PICK what output amperage you want from surplus steppers, The schematic looks good from here, Give me a ring when its done, I am interested in its performance,

?

Good work!

?

Show quoted text

----- Original Message -----

From: cybermace5

To: Electronics_101@...

Sent: Saturday, April 10, 2004 11:52 PM

Subject: [Electronics_101] Re: A3977 Stepper driver (finally) updated.

--- In Electronics_101@..., "ghidera2000" <ghidera2000@y...> wrote: > Waiting for parts on other projects and I've finally digested a lot > of the information provided in previous discussions so, I went back > to work on the stepper driver board. The schematic (pdf) is in the > Stepper Driver folder of the files section. > > The big change was in changing over to an optoisolated interface > with the parallel port. Still a few things about it that I'm shaky > on though I think I'm probably pretty close to PCB time. I created a > Readme file with all the details as well. > > Love to get some feedback! Looking good. I currently use a Xylotex, which is an A3977 3-axis driver, but doesn't have optoisolation or the integrated power supplies and spindle control. I have one suggestion, since you haven't put the work into the PCB yet: if possible, do not use the PLCC package. There is also a surface-mount package that is equally rated. The A3977 is pretty easy to blow up, I blundered and fried two. Desoldering a PLCC is fine with a heat gun, but soldering them is never a picnic, especially if other components don't let you get a nearly flat angle with the iron. The surface mount package would be much easier to solder since you can come down from the top, and you don't get invisible solder bridges underneath the chip. The A3977 is susceptible to more than just back EMF; if you mess with the motor cables even while only 5 volt power is applied, you can still fry them. So it would be a good idea to control the logic and stepper supplies at the same time, so that when it's off, it's OFF. You might also want to provide solder point where people can just wire in their own motor supply. Sometimes you can find really good deals on 24V supplies, possibly free, and not have to worry about building the supply portion of the circuit.

Re: Wireless transmission

Stefan Trethan

#9543

On Sun, 11 Apr 2004 14:49:01 -0000, writetosudeep <sudeepnayak@...> wrote:

Hi All..
I need to Transfer data between two data lines (~5V) .
Is there any such circuit that I could build, with both transmitter
and receiver? IF so, any WEB address would be nice.

Sudeep.
Read recent posts in the archives.
there you will find reference to a elektor magazine which covers the topic.
it uses rx/tx modules you can buy and use in your circuit.

ST

Re: Twisted trio?

Stefan Trethan

#9542

On Sun, 11 Apr 2004 14:29:26 -0000, upand_at_them <upand_at_them@...> wrote:

The two devices I planned on using this for are a LM335 temp sensor
and a Motorola pressure sensor.  Nothing will be over 5V and my wires
will be about 3 feet long.  Soldered and heat-shrink tubing at the
device end and header connector at the other end.

Mike

Are these analog signals or digital?
if digital i would do nothing, a shielded cable if analog.

Keep things low impedance and there will be no problems.

Braided wires are sometimes used with measuring systems, because
it keeps induced voltages similar and also keeps capacitance relatively low.
you can braid more than 3 wires also.

ST

Re: Twisted trio?

Roy J. Tellason

#9541

On Sunday 11 April 2004 10:29 am, upand_at_them wrote:
The two devices I planned on using this for are a LM335 temp sensor
and a Motorola pressure sensor.  Nothing will be over 5V and my wires
will be about 3 feet long.  Soldered and heat-shrink tubing at the
device end and header connector at the other end.Well,  in that case I would twist the wires only to the extent that you want 
to for cosmetic reasons,  and not worry about the effects on the signals...

Mike

--- In Electronics_101@..., "Roy J. Tellason"

<rtellason@b...> wrote:
What kind of signal are you running,  and how is it interfaced ateach end?

How long of a run are you talking about?

Yahoo! Groups Links

Wireless transmission

writetosudeep

#9540

Hi All..
I need to Transfer data between two data lines (~5V) .
Is there any such circuit that I could build, with both transmitter 
and receiver? IF so, any WEB address would be nice.

Sudeep.

Re: Twisted trio?

#9539

The two devices I planned on using this for are a LM335 temp sensor 
and a Motorola pressure sensor.  Nothing will be over 5V and my wires 
will be about 3 feet long.  Soldered and heat-shrink tubing at the 
device end and header connector at the other end.

Mike

--- In Electronics_101@..., "Roy J. Tellason" 
<rtellason@b...> wrote:
What kind of signal are you running,  and how is it interfaced at each end? 
How long of a run are you talking about?