PWM-Vs-VoltageFollower-Vs-DigitalPot
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I need a variable voltage output from a BS2 to controll an LED's brightness. As
I understand it, PWM, Voltage Follower circuitry, or a Digital pot could be used
with a BS2 to electronically control the LED intensity. Which is best. How do
I choose.
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I understand it, PWM, Voltage Follower circuitry, or a Digital pot could be used
with a BS2 to electronically control the LED intensity. Which is best. How do
I choose.
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Comments
project with an OP-amp and code for you.
Lars
--- In basicstamps@yahoogroups.com, Jimmy jones <cantyant@y...>
wrote:
> I need a variable voltage output from a BS2 to controll an LED's
brightness. As I understand it, PWM, Voltage Follower circuitry, or
a Digital pot could be used with a BS2 to electronically control the
LED intensity. Which is best. How do I choose.
>
>
>
> Do you Yahoo!?
> Yahoo! Mail SpamGuard - Read only the mail you want.
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> [noparse][[/noparse]Non-text portions of this message have been removed]
It drops 2.1 Volts across itself for a
large range of currents -- and light output
is more proportional to current than applied
voltage.
Having said that, the usual way to control
an LED's brightness is by varying the on
and off times using PWM. If you cycle faster
than 100 times a second the human eye averages
the 'fast blinks' together into a glow.
Unfortunately, the Stamp does not have a hardware
PWM, and you don't really want to dedicate a
Stamp to making a few LED's glow. So, for stamp
use changing the output voltage of a circuit
-- which gets converted to a variable
current through the LED -- is the most
do-able approach.
See the reference mentioned in an earlier post.
--- In basicstamps@yahoogroups.com, Jimmy jones <cantyant@y...> wrote:
> I need a variable voltage output from a BS2 to controll an LED's
brightness. As I understand it, PWM, Voltage Follower circuitry, or
a Digital pot could be used with a BS2 to electronically control the
LED intensity. Which is best. How do I choose.
>
>
>
> Do you Yahoo!?
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> [noparse][[/noparse]Non-text portions of this message have been removed]
now Which option is best. How do I choose. Where do I find that info at
parallax, i have several of there manuals and text.
lars505050 <ls@l...> wrote:
You may go in and check the documentation at Parallax. The have a
project with an OP-amp and code for you.
Lars
--- In basicstamps@yahoogroups.com, Jimmy jones
wrote:
> I need a variable voltage output from a BS2 to controll an LED's
brightness. As I understand it, PWM, Voltage Follower circuitry, or
a Digital pot could be used with a BS2 to electronically control the
LED intensity. Which is best. How do I choose.
>
>
>
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Lars
--- In basicstamps@yahoogroups.com, Jimmy jones <cantyant@y...>
wrote:
> thanks for the response,
>
> now Which option is best. How do I choose. Where do I find that
info at parallax, i have several of there manuals and text.
>
>
> lars505050 <ls@l...> wrote:
> You may go in and check the documentation at Parallax. The have a
> project with an OP-amp and code for you.
>
> Lars
>
> --- In basicstamps@yahoogroups.com, Jimmy jones
> wrote:
> > I need a variable voltage output from a BS2 to controll an LED's
> brightness. As I understand it, PWM, Voltage Follower circuitry,
or
> a Digital pot could be used with a BS2 to electronically control
the
> LED intensity. Which is best. How do I choose.
> >
> >
> >
> > Do you Yahoo!?
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I built a heart with an arrow through it that consisted of 64 LEDs for my
daughter to use on a Valentine box. I used 8 TI TPIC2810 LED Drivers. I
wrote a routine to create a software PWM to control how long the Enable of
the TPIC2810 was active during a 15 msec period. I was able to vary the
intensity from full on to off. I would be willing to provide you with my
routines if you are interested.
Ron
|
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| | Jimmy jones |
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| | 02/18/2004 11:38 |
| | PM |
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| Subject: [noparse][[/noparse]basicstamps] PWM-Vs-VoltageFollower-Vs-DigitalPot
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I need a variable voltage output from a BS2 to controll an LED's
brightness. As I understand it, PWM, Voltage Follower circuitry, or a
Digital pot could be used with a BS2 to electronically control the LED
intensity. Which is best. How do I choose.
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- ron.metzner@s... wrote:
>
> Jimmy,
>
> I built a heart with an arrow through it that
> consisted of 64 LEDs for my
> daughter to use on a Valentine box. I used 8 TI
> TPIC2810 LED Drivers. I
> wrote a routine to create a software PWM to control
> how long the Enable of
> the TPIC2810 was active during a 15 msec period. I
> was able to vary the
> intensity from full on to off. I would be willing
> to provide you with my
> routines if you are interested.
>
> Ron
>
>
> |
+
>
> | | Jimmy jones |
> | | <cantyant@y...|
> | | om> |
> | | No Phone Info |
> | | Available |
> | | |
> | | 02/18/2004 11:38 |
> | | PM |
> | | Please respond to|
> | | basicstamps |
> | | |
> |
+
>
>
>
>
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>
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> | To: basicstamps@yahoogroups.com
>
> |
> | cc:
>
> |
> | Subject: [noparse][[/noparse]basicstamps]
> PWM-Vs-VoltageFollower-Vs-DigitalPot
> |
>
>
>
\
|
>
>
>
>
> I need a variable voltage output from a BS2 to
> controll an LED's
> brightness. As I understand it, PWM, Voltage
> Follower circuitry, or a
> Digital pot could be used with a BS2 to
> electronically control the LED
> intensity. Which is best. How do I choose.
>
>
>
> Do you Yahoo!?
> Yahoo! Mail SpamGuard - Read only the mail you want.
>
> [noparse][[/noparse]Non-text portions of this message have been
> removed]
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Awww, that's Cute!
--- In basicstamps@yahoogroups.com, ron.metzner@s... wrote:
>
> Jimmy,
>
> I built a heart with an arrow through it that consisted of 64 LEDs
for my
> daughter to use on a Valentine box. I used 8 TI TPIC2810 LED
Drivers. I
> wrote a routine to create a software PWM to control how long the
Enable of
> the TPIC2810 was active during a 15 msec period. I was able to
vary the
> intensity from full on to off. I would be willing to provide you
with my
> routines if you are interested.
>
> Ron
>
>
> |
+
>
> | | Jimmy jones |
> | | <cantyant@y...|
> | | om> |
> | | No Phone Info |
> | | Available |
> | | |
> | | 02/18/2004 11:38 |
> | | PM |
> | | Please respond to|
> | | basicstamps |
> | | |
> |
+
>
> >
|
>
|
|
> | To:
basicstamps@yahoogroups.com
|
> |
cc:
|
> | Subject: [noparse][[/noparse]basicstamps] PWM-Vs-VoltageFollower-Vs-
DigitalPot
|
> >
|
>
>
>
>
> I need a variable voltage output from a BS2 to controll an LED's
> brightness. As I understand it, PWM, Voltage Follower circuitry,
or a
> Digital pot could be used with a BS2 to electronically control the
LED
> intensity. Which is best. How do I choose.
>
>
>
> Do you Yahoo!?
> Yahoo! Mail SpamGuard - Read only the mail you want.
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
>
>
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> Jimmy,
> I built a heart with an arrow through it that
> consisted of 64 LEDs for my
> daughter to use on a Valentine box. I used 8 TI
> TPIC2810 LED Drivers. I
> wrote a routine to create a software PWM to control
> how long the Enable of
> the TPIC2810 was active during a 15 msec period. I
> was able to vary the
> intensity from full on to off. I would be willing
> to provide you with my
> routines if you are interested.
Ron,
I would be interested in your routines, if you are
willing to share them. Thanks.
=====
Chris Savage
Knight Designs
324 West Main Street
Montour Falls, NY 14865
(607) 535-6777
http://www.knightdesigns.com
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Do you know of any lab out there (or at parallax) that uses an adc to convert an
analog input to digital, to connect to a BS2, and then sends out a variable
output on another pin. The labs we spoke of are simply for the variable output
and display in a debug window. I dont need the debug window display and what I
do need is an adc input program along with the output program (and possably a
wiring descripition)?
Allan Lane <allan.lane@h...> wrote:
Okay, everybody now, 1.. 2.. 3..
Awww, that's Cute!
--- In basicstamps@yahoogroups.com, ron.metzner@s... wrote:
>
> Jimmy,
>
> I built a heart with an arrow through it that consisted of 64 LEDs
for my
> daughter to use on a Valentine box. I used 8 TI TPIC2810 LED
Drivers. I
> wrote a routine to create a software PWM to control how long the
Enable of
> the TPIC2810 was active during a 15 msec period. I was able to
vary the
> intensity from full on to off. I would be willing to provide you
with my
> routines if you are interested.
>
> Ron
>
>
> |
+
>
> | | Jimmy jones |
> | | > | | om> |
> | | No Phone Info |
> | | Available |
> | | |
> | | 02/18/2004 11:38 |
> | | PM |
> | | Please respond to|
> | | basicstamps |
> | | |
> |
+
>
> >
|
>
|
|
> | To:
basicstamps@yahoogroups.com
|
> |
cc:
|
> | Subject: [noparse][[/noparse]basicstamps] PWM-Vs-VoltageFollower-Vs-
DigitalPot
|
> >
|
>
>
>
>
> I need a variable voltage output from a BS2 to controll an LED's
> brightness. As I understand it, PWM, Voltage Follower circuitry,
or a
> Digital pot could be used with a BS2 to electronically control the
LED
> intensity. Which is best. How do I choose.
>
>
>
> Do you Yahoo!?
> Yahoo! Mail SpamGuard - Read only the mail you want.
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
>
>
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Do you know of any lab out there (or at parallax) that uses an adc to convert an
analog input to digital, to connect to a BS2, and then sends out a variable
output on another pin. The labs we spoke of are simply for the variable output
and display in a debug window. I dont need the debug window display and what I
do need is an adc input program along with the output program (and possably a
wiring descripition)?
or how would I combine one program for an ADC with a program for a variable
output
Allan Lane <allan.lane@h...> wrote:
Okay, everybody now, 1.. 2.. 3..
Awww, that's Cute!
--- In basicstamps@yahoogroups.com, ron.metzner@s... wrote:
>
> Jimmy,
>
> I built a heart with an arrow through it that consisted of 64 LEDs
for my
> daughter to use on a Valentine box. I used 8 TI TPIC2810 LED
Drivers. I
> wrote a routine to create a software PWM to control how long the
Enable of
> the TPIC2810 was active during a 15 msec period. I was able to
vary the
> intensity from full on to off. I would be willing to provide you
with my
> routines if you are interested.
>
> Ron
>
>
> |
+
>
> | | Jimmy jones |
> | | > | | om> |
> | | No Phone Info |
> | | Available |
> | | |
> | | 02/18/2004 11:38 |
> | | PM |
> | | Please respond to|
> | | basicstamps |
> | | |
> |
+
>
> >
|
>
|
|
> | To:
basicstamps@yahoogroups.com
|
> |
cc:
|
> | Subject: [noparse][[/noparse]basicstamps] PWM-Vs-VoltageFollower-Vs-
DigitalPot
|
> >
|
>
>
>
>
> I need a variable voltage output from a BS2 to controll an LED's
> brightness. As I understand it, PWM, Voltage Follower circuitry,
or a
> Digital pot could be used with a BS2 to electronically control the
LED
> intensity. Which is best. How do I choose.
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that would be great. How do I apply it to a single LED and only use the
bright/dim routine?
ron.metzner@s... wrote:
Jimmy,
I built a heart with an arrow through it that consisted of 64 LEDs for my
daughter to use on a Valentine box. I used 8 TI TPIC2810 LED Drivers. I
wrote a routine to create a software PWM to control how long the Enable of
the TPIC2810 was active during a 15 msec period. I was able to vary the
intensity from full on to off. I would be willing to provide you with my
routines if you are interested.
Ron
|
+
>
| | Jimmy jones |
| | | | om> |
| | No Phone Info |
| | Available |
| | |
| | 02/18/2004 11:38 |
| | PM |
| | Please respond to|
| | basicstamps |
| | |
|
+
>
>
\
|
| |
| To: basicstamps@yahoogroups.com |
| cc: |
| Subject: [noparse][[/noparse]basicstamps] PWM-Vs-VoltageFollower-Vs-DigitalPot |
>
\
|
I need a variable voltage output from a BS2 to controll an LED's
brightness. As I understand it, PWM, Voltage Follower circuitry, or a
Digital pot could be used with a BS2 to electronically control the LED
intensity. Which is best. How do I choose.
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email, please reply to me(Jimmy jomes or cantyant@y...) AT
gooey_lou@y...
Jimmy jones <cantyant@y...> wrote:
hello,
that would be great. How do I apply it to a single LED and only use the
bright/dim routine?
ron.metzner@s... wrote:
Jimmy,
I built a heart with an arrow through it that consisted of 64 LEDs for my
daughter to use on a Valentine box. I used 8 TI TPIC2810 LED Drivers. I
wrote a routine to create a software PWM to control how long the Enable of
the TPIC2810 was active during a 15 msec period. I was able to vary the
intensity from full on to off. I would be willing to provide you with my
routines if you are interested.
Ron
|
+
>
| | Jimmy jones |
| | | | om> |
| | No Phone Info |
| | Available |
| | |
| | 02/18/2004 11:38 |
| | PM |
| | Please respond to|
| | basicstamps |
| | |
|
+
>
>
\
|
| |
| To: basicstamps@yahoogroups.com |
| cc: |
| Subject: [noparse][[/noparse]basicstamps] PWM-Vs-VoltageFollower-Vs-DigitalPot |
>
\
|
I need a variable voltage output from a BS2 to controll an LED's
brightness. As I understand it, PWM, Voltage Follower circuitry, or a
Digital pot could be used with a BS2 to electronically control the LED
intensity. Which is best. How do I choose.
Do you Yahoo!?
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let me give it a try.
Ron.Metzner@s... wrote:
Jimmy,
I am sorry for not getting back earlier. This routine will work for a
single LED. This routine assumes the LED is turned on by taking one of the
I/O lines low. In my case I had it set to 2. You can adjust 'FadePrd' to
eliminate blinking. This is like a software PWM where FadePrd determines
the cycle period and TimeOn is used to keep track of how long to keep the
LED on in the cycle period. This program will continuously
increase/decrease the brightness of an LED. I was going to try this before
I sent it to you since I modified this code to run on one LED and not 64
but did not get around to it. I took out all the code that utilized the 8
LED drivers. Let me know if it does not work. I will also try it out
tonight.
'{$STAMP BS2p} 'STAMP directive (specifies a BS2p)
FadeCyc CON 5 'Number of times to spend at each fade
level
LEDen CON 2 'Set which I/O pin controls enabling LED
driver. LEDen is active low.
FadePrd CON 15 'Cycle time (period) to toggle LED
Fades VAR NIB 'Var to count how many times to delay going
to next fade level
HowMany VAR BYTE 'How Many times to loop through the feature
TimeOn VAR BYTE 'Time delay to keep LED on
Start:
HIGH LEDen 'Turn off LED
'This part of the routine increases the intensity of the LED from off to on
FOR TimeOn = 1 to FadePrd 'Set time LED is on from 1 to 15 ms
FOR Fades = 1 to FadeCyc 'Stay at this fade level for the number of
times specified in FadeCyc
LOW LEDen 'Turn on LED
PAUSE TimeOn 'Delay time specified in TimeOn before
turning off LED
HIGH LEDen 'Turn off LED
PAUSE (FadePrd - TimeOn) 'Keep LED off for remaining time left in
fade cycle
NEXT
NEXT
'This part of the routine decreases the intensity of the LED from on to off
FOR TimeOn = 1 to FadePrd 'Set time LED is turned off in the cycle
from 1 to 15 ms
FOR Fades = 1 to FadeCyc 'Stay at this fade level for the number of
times specified in FadeCyc
LOW LEDen 'Turn on LED
PAUSE (FadePrd - TimeOn) 'Delay time specified in FadePrd - TimeOn
before turning LED off
HIGH LEDen 'Turn off LED
PAUSE TimeOn 'Keep LED off for remaining time left in
fade cycle
NEXT
NEXT
GOTO Start
Thanks.
Ron
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[noparse][[/noparse]Non-text portions of this message have been removed]
gooey <cantyant@y...> wrote:thanks,
let me give it a try.
Ron.Metzner@s... wrote:
Jimmy,
I am sorry for not getting back earlier. This routine will work for a
single LED. This routine assumes the LED is turned on by taking one of the
I/O lines low. In my case I had it set to 2. You can adjust 'FadePrd' to
eliminate blinking. This is like a software PWM where FadePrd determines
the cycle period and TimeOn is used to keep track of how long to keep the
LED on in the cycle period. This program will continuously
increase/decrease the brightness of an LED. I was going to try this before
I sent it to you since I modified this code to run on one LED and not 64
but did not get around to it. I took out all the code that utilized the 8
LED drivers. Let me know if it does not work. I will also try it out
tonight.
'{$STAMP BS2p} 'STAMP directive (specifies a BS2p)
FadeCyc CON 5 'Number of times to spend at each fade
level
LEDen CON 2 'Set which I/O pin controls enabling LED
driver. LEDen is active low.
FadePrd CON 15 'Cycle time (period) to toggle LED
Fades VAR NIB 'Var to count how many times to delay going
to next fade level
HowMany VAR BYTE 'How Many times to loop through the feature
TimeOn VAR BYTE 'Time delay to keep LED on
Start:
HIGH LEDen 'Turn off LED
'This part of the routine increases the intensity of the LED from off to on
FOR TimeOn = 1 to FadePrd 'Set time LED is on from 1 to 15 ms
FOR Fades = 1 to FadeCyc 'Stay at this fade level for the number of
times specified in FadeCyc
LOW LEDen 'Turn on LED
PAUSE TimeOn 'Delay time specified in TimeOn before
turning off LED
HIGH LEDen 'Turn off LED
PAUSE (FadePrd - TimeOn) 'Keep LED off for remaining time left in
fade cycle
NEXT
NEXT
'This part of the routine decreases the intensity of the LED from on to off
FOR TimeOn = 1 to FadePrd 'Set time LED is turned off in the cycle
from 1 to 15 ms
FOR Fades = 1 to FadeCyc 'Stay at this fade level for the number of
times specified in FadeCyc
LOW LEDen 'Turn on LED
PAUSE (FadePrd - TimeOn) 'Delay time specified in FadePrd - TimeOn
before turning LED off
HIGH LEDen 'Turn off LED
PAUSE TimeOn 'Keep LED off for remaining time left in
fade cycle
NEXT
NEXT
GOTO Start
Thanks.
Ron
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