two stamps triggering same LED
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Posts: 46,084
I have two stamps. One was programmed by someone else, and the other
one has my code on it. I simply want my stamp to power a LED
occasionally. The LED is also connected to one of the output pins of
the other stamp.
So basically I have an output from each stamp connected to the same
LED. I know it would be bad if I drove one stamp pin high while the
other was trying to be low, but could I just put a 1n914 diode on
both of the stamp pins so there wouldn't be a problem?
one has my code on it. I simply want my stamp to power a LED
occasionally. The LED is also connected to one of the output pins of
the other stamp.
So basically I have an output from each stamp connected to the same
LED. I know it would be bad if I drove one stamp pin high while the
other was trying to be low, but could I just put a 1n914 diode on
both of the stamp pins so there wouldn't be a problem?
Comments
Stamp 1
[noparse][[/noparse]>|
+
| LED
*
[noparse][[/noparse]>|
\/\/\
Vss
|
Stamp 2
[noparse][[/noparse]>|
+
-- Jon Williams
-- Parallax
Original Message
From: andy_watson5 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=Vdj5107k26ya665hoTrvQwgzrSb086_KOESNG84gnR0nY0uIp-i8Z33YQw_om_kuHPHb3hHJ0ebCN6iZBLI]andywatson@m...[/url
Sent: Tuesday, March 09, 2004 5:18 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] two stamps triggering same LED
I have two stamps. One was programmed by someone else, and the other
one has my code on it. I simply want my stamp to power a LED
occasionally. The LED is also connected to one of the output pins of
the other stamp.
So basically I have an output from each stamp connected to the same
LED. I know it would be bad if I drove one stamp pin high while the
other was trying to be low, but could I just put a 1n914 diode on
both of the stamp pins so there wouldn't be a problem?
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abuse@p....
> I have two stamps. One was programmed by someone
> else, and the other
> one has my code on it. I simply want my stamp to
> power a LED
> occasionally. The LED is also connected to one of
> the output pins of
> the other stamp.
So, Andy, you don't have a way to know which stamp is
lighting the LED...Is that okay? Just curious.
=====
Chris Savage
Knight Designs
324 West Main Street
Montour Falls, NY 14865
(607) 535-6777
http://www.knightdesigns.com
__________________________________
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like 99 cents.
On Tue, 9 Mar 2004, Jon Williams wrote:
> Not a good idea unless you put a diode on the other side as well.
>
> Stamp 1
[noparse][[/noparse]>|
+
> | LED
> *
[noparse][[/noparse]>|
\/\/\
Vss
> |
> Stamp 2
[noparse][[/noparse]>|
+
>
>
> -- Jon Williams
> -- Parallax
>
>
>
Original Message
> From: andy_watson5 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=AKlT8n_r_AR9wgIEGVUNyuRKa54MkZsSYVEK30bCfwnfdX2cBjIJtuLFgkPlBhSq4ilw7VPeLdcQ]andywatson@m...[/url
> Sent: Tuesday, March 09, 2004 5:18 PM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] two stamps triggering same LED
>
>
> I have two stamps. One was programmed by someone else, and the other
> one has my code on it. I simply want my stamp to power a LED
> occasionally. The LED is also connected to one of the output pins of
> the other stamp.
>
> So basically I have an output from each stamp connected to the same
> LED. I know it would be bad if I drove one stamp pin high while the
> other was trying to be low, but could I just put a 1n914 diode on
> both of the stamp pins so there wouldn't be a problem?
>
>
>
> To UNSUBSCRIBE, just send mail to:
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>
> Yahoo! Groups Links
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>
>
>
>
>
>
> This message has been scanned by WebShield. Please report SPAM to
> abuse@p....
>
>
>
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>
Sean T. Lamont, CTO / Chief NetNerd, Abstract Software, Inc. (ServNet)
Seattle - Bellingham - Vancouver - Portland - Everett - Tacoma - Bremerton
email: lamont@a... WWW: http://www.serv.net
"Do not fear mistakes, There Are None" - Miles Davis
thought I'd try doing it with just diodes and save a little room on
my already cramped circuit board.
--- In basicstamps@yahoogroups.com, "Sean T. Lamont .lost."
<lamont@a...> wrote:
>
> Isn't this just a logical or? You can buy an or gate at radio shack
for
> like 99 cents.
>
> On Tue, 9 Mar 2004, Jon Williams wrote:
>
> > Not a good idea unless you put a diode on the other side as well.
> >
> > Stamp 1
[noparse][[/noparse]>|
+
> > | LED
> > *
[noparse][[/noparse]>|
\/\/\
Vss
> > |
> > Stamp 2
[noparse][[/noparse]>|
+
> >
> >
> > -- Jon Williams
> > -- Parallax
> >
> >
> >
Original Message
> > From: andy_watson5 [noparse][[/noparse]mailto:andywatson@m...]
> > Sent: Tuesday, March 09, 2004 5:18 PM
> > To: basicstamps@yahoogroups.com
> > Subject: [noparse][[/noparse]basicstamps] two stamps triggering same LED
> >
> >
> > I have two stamps. One was programmed by someone else, and the
other
> > one has my code on it. I simply want my stamp to power a LED
> > occasionally. The LED is also connected to one of the output
pins of
> > the other stamp.
> >
> > So basically I have an output from each stamp connected to the
same
> > LED. I know it would be bad if I drove one stamp pin high while
the
> > other was trying to be low, but could I just put a 1n914 diode on
> > both of the stamp pins so there wouldn't be a problem?
> >
> >
> >
> > 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.
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> > This message has been scanned by WebShield. Please report SPAM to
> > abuse@p...
> >
> >
> >
> > 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.
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
>
> Sean T. Lamont, CTO / Chief NetNerd, Abstract Software, Inc.
(ServNet)
> Seattle - Bellingham - Vancouver - Portland - Everett - Tacoma -
Bremerton
> email: lamont@a... WWW: http://www.serv.net
> "Do not fear mistakes, There Are None" - Miles Davis
stamp cant really handle that much current from a single pin. Should switcvh
a transistor and power the led from the seperate 5v supply.
>
Original Message
> From: andy_watson5 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=AUiGQb-UCEGvRAyuXzTwWLmxd9YFtHfxSK0fGHygoPKwI5WbBYtNcJBvwyVCN7jlLQFJUNnTjDf31w]andywatson@m...[/url
> Sent: March 9, 2004 3:18 PM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] two stamps triggering same LED
>
>
> I have two stamps. One was programmed by someone else, and the other
> one has my code on it. I simply want my stamp to power a LED
> occasionally. The LED is also connected to one of the output pins of
> the other stamp.
>
> So basically I have an output from each stamp connected to the same
> LED. I know it would be bad if I drove one stamp pin high while the
> other was trying to be low, but could I just put a 1n914 diode on
> both of the stamp pins so there wouldn't be a problem?
>
>
>
> 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.
>
> Yahoo! Groups Links
>
>
>
>
>
>
we drive LEDs all the time right out of the BASIC Stamp. A typical LED
only requires about 5 mA or so to light nicely. The only thing one
needs to be cautious of is driving too many LEDs from on IO group.
-- Jon Williams
-- Parallax
Original Message
From: PatM [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=B5_MGST_Vtsf2vJfqLSZtm0MBhZVXsqlpDiepNm-P3s05U_4kvVOxW91VxmskWLyOfzH_BFc0w]pmeloy@s...[/url
Sent: Tuesday, March 09, 2004 9:29 PM
To: basicstamps@yahoogroups.com
Subject: RE: [noparse][[/noparse]basicstamps] two stamps triggering same LED
First thing I'd worry about is driving and LED from a stamp pin period!
The stamp cant really handle that much current from a single pin. Should
switcvh a transistor and power the led from the seperate 5v supply.
>
Original Message
> From: andy_watson5 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=OZ60X5w5OG16alBMuj8IP8voRmhwRFMbnZ4KW_o4CYnDb-rP3gf1d8DxCo3ymrlp6cQ4BBAX6k-5IA]andywatson@m...[/url
> Sent: March 9, 2004 3:18 PM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] two stamps triggering same LED
>
>
> I have two stamps. One was programmed by someone else, and the other
> one has my code on it. I simply want my stamp to power a LED
> occasionally. The LED is also connected to one of the output pins of
> the other stamp.
>
> So basically I have an output from each stamp connected to the same
> LED. I know it would be bad if I drove one stamp pin high while the
> other was trying to be low, but could I just put a 1n914 diode on both
> of the stamp pins so there wouldn't be a problem?
Connect the output pin of each stamp to the cathode of any standard
rectifier diode, a 1N4003 would do fine.
Connect the anode ends of the two rectifiers together.
Connect the anode ends also to the LED.
Connect the other end of the LED to the current limiting resistor. If it's
a 5 Volt system, and the LED is a 20 mA unit, then 300 Ohm is what I use.
Connect the other end of the current limiting resistor to +5 Volts.
With this connection, the LED will be illuminated when either of the two
stamps pulls the correct pin low.
>
Original Message
> From: andy_watson5 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=DLnAek2b42z7DHBkw0dWlNRqgoLsWHH0y2SNHL620tPKzI-8nvjSrzPCz5z61d3zxchEm2CLDUzR5QZ-]andywatson@m...[/url
> Sent: March 9, 2004 3:18 PM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] two stamps triggering same LED
>
>
> I have two stamps. One was programmed by someone else, and the other
> one has my code on it. I simply want my stamp to power a LED
> occasionally. The LED is also connected to one of the output pins of
> the other stamp.
>
> So basically I have an output from each stamp connected to the same
> LED. I know it would be bad if I drove one stamp pin high while the
> other was trying to be low, but could I just put a 1n914 diode on both
> of the stamp pins so there wouldn't be a problem?
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.
Yahoo! Groups Links
with 7 segment displays a long while back - maybe thats why I was thinking
of the stamp not being able to handle the current.
Senility creeping up!
>
Original Message
> From: Jon Williams [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=adwckNf8nPCT381z1biVqZ2EBM2BUiMS3GTklT2u3lYvzAvbyWrmpUClpggE8CK1KQCWh2zBaAsaW2eBrObL2g]jwilliams@p...[/url
> Sent: March 9, 2004 8:27 PM
> To: basicstamps@yahoogroups.com
> Subject: RE: [noparse][[/noparse]basicstamps] two stamps triggering same LED
>
>
> Where are you getting that idea? Puhleeze (excuse my incredulity) ...
> we drive LEDs all the time right out of the BASIC Stamp. A typical LED
> only requires about 5 mA or so to light nicely. The only thing one
> needs to be cautious of is driving too many LEDs from on IO group.
>
> -- Jon Williams
> -- Parallax
>
>
>
>
>
be aware and control current. I typically use a 470 ohm current limiter
for LEDs when it's up to a few, but for a 7-segment display I bump the
current limiters up to 1K to protect the BASIC Stamp.
I hope I did come on too strong ... may I suggest that we all be careful
about what the BASIC Stamp CAN'T do without checking [noparse][[/noparse]the docs]
carefully as there are lots of youngsters and newcomers that will take
our word as gospel.
-- Jon Williams
-- Parallax
Original Message
From: PatM [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=pkT8K7DvZLA9FdllLljGKQsSR7y5LwMmeqYBZVTbA79R8kFSzgCYMw0_WKOeG0JiaJOfbHeL]pmeloy@s...[/url
Sent: Wednesday, March 10, 2004 10:23 AM
To: basicstamps@yahoogroups.com
Subject: RE: [noparse][[/noparse]basicstamps] two stamps triggering same LED
Hmm, I must have been thinking multiple LEDs or something. I did some
work with 7 segment displays a long while back - maybe thats why I was
thinking of the stamp not being able to handle the current.
Senility creeping up!
>
Original Message
> From: Jon Williams [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=og1pgeuQ2KcxS0uP4-_6X00lGJe5DOz_itg7s0mN-9DHy9-gH5Q-K20ke7HewS4ZKBBrA_1epVICc8JV2Q]jwilliams@p...[/url
> Sent: March 9, 2004 8:27 PM
> To: basicstamps@yahoogroups.com
> Subject: RE: [noparse][[/noparse]basicstamps] two stamps triggering same LED
>
>
> Where are you getting that idea? Puhleeze (excuse my incredulity) ...
> we drive LEDs all the time right out of the BASIC Stamp. A typical
> LED only requires about 5 mA or so to light nicely. The only thing
> one needs to be cautious of is driving too many LEDs from on IO group.
>
> -- Jon Williams
> -- Parallax
program to accept two different signals and log it at the same exact
time. Example I am trying to keep track of my employees when they
arrive to work with there id badges being swiped in the office reader.
It should store the first track that consist of their first and last
name and also at the same time log their employee number that is on the
second line and store it. Could this be possible? If so could someone
give me a example of doing different task at the same time? Please?
Original Message
From: Jon Williams [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=iWV_J_BWm9myr5oLrBGndzlYKC3Yp9FD3L3AW7XaNsSNsouLZ_G8NGbjCcQA2Cx3e2LdQrWnK3Fd9yaLCw]jwilliams@p...[/url
Sent: Wednesday, March 10, 2004 10:34 AM
To: basicstamps@yahoogroups.com
Subject: RE: [noparse][[/noparse]basicstamps] two stamps triggering same LED
Yes, when lighting multiple LEDs (as with a 7-segment display) we must
be aware and control current. I typically use a 470 ohm current limiter
for LEDs when it's up to a few, but for a 7-segment display I bump the
current limiters up to 1K to protect the BASIC Stamp.
I hope I did come on too strong ... may I suggest that we all be careful
about what the BASIC Stamp CAN'T do without checking [noparse][[/noparse]the docs]
carefully as there are lots of youngsters and newcomers that will take
our word as gospel.
-- Jon Williams
-- Parallax
Original Message
From: PatM [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=v3ZIsHdiPRn87MNdCT9KjlHZSPA-G2yT5wQwS4AEAokDKBaIg4wjd2xsn14WtPKp53Km-lg]pmeloy@s...[/url
Sent: Wednesday, March 10, 2004 10:23 AM
To: basicstamps@yahoogroups.com
Subject: RE: [noparse][[/noparse]basicstamps] two stamps triggering same LED
Hmm, I must have been thinking multiple LEDs or something. I did some
work with 7 segment displays a long while back - maybe thats why I was
thinking of the stamp not being able to handle the current.
Senility creeping up!
>
Original Message
> From: Jon Williams [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=iWV_J_BWm9myr5oLrBGndzlYKC3Yp9FD3L3AW7XaNsSNsouLZ_G8NGbjCcQA2Cx3e2LdQrWnK3Fd9yaLCw]jwilliams@p...[/url
> Sent: March 9, 2004 8:27 PM
> To: basicstamps@yahoogroups.com
> Subject: RE: [noparse][[/noparse]basicstamps] two stamps triggering same LED
>
>
> Where are you getting that idea? Puhleeze (excuse my incredulity) ...
> we drive LEDs all the time right out of the BASIC Stamp. A typical
> LED only requires about 5 mA or so to light nicely. The only thing
> one needs to be cautious of is driving too many LEDs from on IO group.
>
> -- Jon Williams
> -- Parallax
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