Pushbutton of 300 ft. away
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I need to tight up a push button for Stamp II. That is not complicated since
we just need to use a 5V to any pin via a 100K resistor, in between using an
on / off switch to ground. The Stamp detect a LOW on pressing button. Stamp
is nice with Button command for debounce key press.
However, what about if I need to use the button from 300 feet away from the
Stamp? Do I do the same as above? Should I use another stamp with RS485 to
connect the two stamps? Is there any simpler way to do it?
Thanks for any advice.
John Leung
we just need to use a 5V to any pin via a 100K resistor, in between using an
on / off switch to ground. The Stamp detect a LOW on pressing button. Stamp
is nice with Button command for debounce key press.
However, what about if I need to use the button from 300 feet away from the
Stamp? Do I do the same as above? Should I use another stamp with RS485 to
connect the two stamps? Is there any simpler way to do it?
Thanks for any advice.
John Leung
Comments
Good luck!
Al Williams
AWC
* Easy RS-232 Prototyping
http://www.al-williams.com/awce/rs1.htm
>
Original Message
> From: John Leung [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=Rj4EsArxjSjZSeTJ29Btz7u9evkpZUwlnmfvoiut51Zg2l6BHbbLKQdQYj4oV-bXzqwUcQUP_vqQqxkpBPulo3o]jleung00@n...[/url
> Sent: Tuesday, February 19, 2002 8:36 PM
> To: basicstamps@yahoogroups.com
> Subject: Re: [noparse][[/noparse]basicstamps] Pushbutton of 300 ft. away
>
>
> I need to tight up a push button for Stamp II. That is not
> complicated since we just need to use a 5V to any pin via a
> 100K resistor, in between using an on / off switch to ground.
> The Stamp detect a LOW on pressing button. Stamp is nice with
> Button command for debounce key press.
>
> However, what about if I need to use the button from 300 feet
> away from the Stamp? Do I do the same as above? Should I use
> another stamp with RS485 to connect the two stamps? Is there
> any simpler way to do it?
>
> Thanks for any advice.
>
> John Leung
>
>
>
> To UNSUBSCRIBE, just send mail to:
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> Subject and Body of the message will be ignored.
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>
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> http://docs.yahoo.com/info/terms/
>
Very sorry that I have not explained my situation very clear. In fact the
other side is also a standard printing device. I need to send data from the
Stamp to that printing device from 300 ft. too. Because I need to add a push
button to the printing device such that when the button is pressed, Stamp
get signal and sending data to printing device. For sending data from stamp
to printer, I have found a useful app note about SN75176 (RS485). However,
how to handle the push button them?
I don't know if it is possible to simply put 5V and ground and a press
button to 300ft apart from the stamp. Should I use some sort of voltage
up/down for transmitting the voltage signal for long distance? Or else there
is other better way to do the job.
The following diagram shows my concern:
5V
......300 ft away
100K---| Stamp pin 0 (say)
--|-push button
..............................
| stamp
GND
GND
John
Original Message
From: Al Williams <alw@a...>
To: <basicstamps@yahoogroups.com>
Sent: Wednesday, February 20, 2002 10:39 AM
Subject: RE: [noparse][[/noparse]basicstamps] Pushbutton of 300 ft. away
> Go wireless! http://www.al-williams.com/awce/som.htm
>
> Good luck!
>
> Al Williams
> AWC
> * Easy RS-232 Prototyping
> http://www.al-williams.com/awce/rs1.htm
printer to do what you need to do. We easily got 500' with the right cable
and a Max232 on the source of the serial data.
Original Message
> Very sorry that I have not explained my situation very clear. In fact the
> other side is also a standard printing device. I need to send data from
the
> Stamp to that printing device from 300 ft. too. Because I need to add a
push
> button to the printing device such that when the button is pressed, Stamp
> get signal and sending data to printing device. For sending data from
stamp
> to printer, I have found a useful app note about SN75176 (RS485). However,
> how to handle the push button them?
>
> I don't know if it is possible to simply put 5V and ground and a press
> button to 300ft apart from the stamp. Should I use some sort of voltage
> up/down for transmitting the voltage signal for long distance? Or else
there
> is other better way to do the job.
>However, what about if I need to use the button from 300 feet away from the
>Stamp? Do I do the same as above? Should I use another stamp with RS485 to
>connect the two stamps? Is there any simpler way to do it?
300 Feet is no problem if you are careful.
I'd use shielded twisted pair cable, with the shield connected to circuit
Gnd at the stamp end only. Use a 1K pullup resistor on the switch, with a
10K series between the switch and the stamp. Adding a small bypass
capacitor (0.1 uF) from the stamp pin to Gnd will reduce noise pickup. Be
sure to delay a short time when first starting up after applying power: the
bypass cap will look like a momentary switch closure until it
charges. This is less than 10 ms - usually no problem at all. But you
need to be aware of it.
Vdd
|
1K
long cable |
but o
+---- 10K---+--- Stamp Pin
but o
+ |
sh o---+ | 0.1 uF cap
| | |
gnd gnd gnd
dwayne
Dwayne Reid <dwayner@p...>
Trinity Electronics Systems Ltd Edmonton, AB, CANADA
(780) 489-3199 voice (780) 487-6397 fax
Celebrating 18 years of Engineering Innovation (1984 - 2002)
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4-20mA current loop would work here. This is a standard for transmitting
signals long distances in noisy environments.
--
Greg
John Leung wrote:
>I need to tight up a push button for Stamp II. That is not complicated since
>we just need to use a 5V to any pin via a 100K resistor, in between using an
>on / off switch to ground. The Stamp detect a LOW on pressing button. Stamp
>is nice with Button command for debounce key press.
>
>However, what about if I need to use the button from 300 feet away from the
>Stamp? Do I do the same as above? Should I use another stamp with RS485 to
>connect the two stamps? Is there any simpler way to do it?
>
>Thanks for any advice.
>
>John Leung
4-20mA current loop in detail. It is intended for transmitting an analog
signal, but I was thinking you could also use it as either an ON/OFF signal
too (e.g., across 250 ohms 4mA would give 1V for low and 20mA would give 5V
for high).
--
Greg
John Leung wrote:
>Dear Gregory
>
>First of all, thanks for your advice. Could you elaborate more?
>
>Thanks for your help in advance.
>
>John
>
>
>
Original Message
>From: "Gregory D Wagner" <gregory-wagner@u...>
>To: <basicstamps@yahoogroups.com>
>Sent: Wednesday, February 20, 2002 6:30 AM
>Subject: Re: [noparse][[/noparse]basicstamps] Pushbutton of 300 ft. away
>
>
> > I'm not sure if I fully understand your question, but it sounds like a
> > 4-20mA current loop would work here. This is a standard for transmitting
> > signals long distances in noisy environments.
> > --
> > Greg
> >
> > John Leung wrote:
> > >I need to tight up a push button for Stamp II. That is not complicated
>since
> > >we just need to use a 5V to any pin via a 100K resistor, in between using
>an
> > >on / off switch to ground. The Stamp detect a LOW on pressing button.
>Stamp
> > >is nice with Button command for debounce key press.
> > >
> > >However, what about if I need to use the button from 300 feet away from
>the
> > >Stamp? Do I do the same as above? Should I use another stamp with RS485
>to
> > >connect the two stamps? Is there any simpler way to do it?
> > >
> > >Thanks for any advice.
> > >
> > >John Leung
300 baud with an Epson LX300 or LX300+ printer using a MAX232 on the
processor end. We used Belden 8770 (If I remember right) cable, which is a
3-conductor shielded cable. The BUSY line from the printer signaled the
processor it was ok to print. The printers are still available through
various sources for under $200.
Original Message
> Since we are looking forward to some sort of thermal ticket printer, and
> there is hardly any button on it, so I need to modify a little bit. Do you
> mean MAX232 with the right cable (high quality shield, twist pair cable)
> will do the job of transmission over 500 ft? I really need to experiment
> with that.
>
Since we are looking forward to some sort of thermal ticket printer, and
there is hardly any button on it, so I need to modify a little bit. Do you
mean MAX232 with the right cable (high quality shield, twist pair cable)
will do the job of transmission over 500 ft? I really need to experiment
with that.
Do you have any experience with that?
John
Original Message
From: "Rodent" <daweasel@s...>
To: <basicstamps@yahoogroups.com>
Sent: Tuesday, February 19, 2002 8:07 PM
Subject: Re: [noparse][[/noparse]basicstamps] Pushbutton of 300 ft. away
> Why not use a serial printer (Epson LX300+) and use the pause button on
the
> printer to do what you need to do. We easily got 500' with the right cable
> and a Max232 on the source of the serial data.
>
>
Original Message
>
> > Very sorry that I have not explained my situation very clear. In fact
the
> > other side is also a standard printing device. I need to send data from
> the
> > Stamp to that printing device from 300 ft. too. Because I need to add a
> push
> > button to the printing device such that when the button is pressed,
Stamp
> > get signal and sending data to printing device. For sending data from
> stamp
> > to printer, I have found a useful app note about SN75176 (RS485).
However,
> > how to handle the push button them?
> >
> > I don't know if it is possible to simply put 5V and ground and a press
> > button to 300ft apart from the stamp. Should I use some sort of voltage
> > up/down for transmitting the voltage signal for long distance? Or else
> there
> > is other better way to do the job.
>
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
First of all, thanks for your advice. Could you elaborate more?
Thanks for your help in advance.
John
Original Message
From: "Gregory D Wagner" <gregory-wagner@u...>
To: <basicstamps@yahoogroups.com>
Sent: Wednesday, February 20, 2002 6:30 AM
Subject: Re: [noparse][[/noparse]basicstamps] Pushbutton of 300 ft. away
> I'm not sure if I fully understand your question, but it sounds like a
> 4-20mA current loop would work here. This is a standard for transmitting
> signals long distances in noisy environments.
> --
> Greg
>
> John Leung wrote:
> >I need to tight up a push button for Stamp II. That is not complicated
since
> >we just need to use a 5V to any pin via a 100K resistor, in between using
an
> >on / off switch to ground. The Stamp detect a LOW on pressing button.
Stamp
> >is nice with Button command for debounce key press.
> >
> >However, what about if I need to use the button from 300 feet away from
the
> >Stamp? Do I do the same as above? Should I use another stamp with RS485
to
> >connect the two stamps? Is there any simpler way to do it?
> >
> >Thanks for any advice.
> >
> >John Leung
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>