Clearing a latch, and a couple other basic questions
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Posts: 46,084
Hi everybody,
I am currently building a speed trap to monitor traffic. I am using two
ir sensors, which are not very fun to work with, that are connected to
an SR latch which would then be hooked up to the pulsin function. When
the first sensor is tripped it will change an input on the latch which
would also make the output on the latch go to a one until the second
sensor is tripped. This "pulse" would then be used as the pulsin
input. When I start up my BS2 I would like to intially set both input
states to 0 0 and have an output of 0 on my latch. How would I go about
doing this in my code? Better yet can I even do this with the stamp?
Also is there a way to monitor the battery that is used to supply the
stamp?
Could I use the 5 V output on the stamp to supply my latch chip, two IR
emitters, and two IR receivers? I guess overall how much current can I
draw from the stamp?
thanks,
babz
I am currently building a speed trap to monitor traffic. I am using two
ir sensors, which are not very fun to work with, that are connected to
an SR latch which would then be hooked up to the pulsin function. When
the first sensor is tripped it will change an input on the latch which
would also make the output on the latch go to a one until the second
sensor is tripped. This "pulse" would then be used as the pulsin
input. When I start up my BS2 I would like to intially set both input
states to 0 0 and have an output of 0 on my latch. How would I go about
doing this in my code? Better yet can I even do this with the stamp?
Also is there a way to monitor the battery that is used to supply the
stamp?
Could I use the 5 V output on the stamp to supply my latch chip, two IR
emitters, and two IR receivers? I guess overall how much current can I
draw from the stamp?
thanks,
babz
Comments
How far apart are your sensors as if the distance is large enough you could
possibly use the STAMP
for everything.
There are lots of ways to do this so i expect that you'll have many ideas
from our STAMPERS!
I would probably not use a STAMP since all you need is a pulse generator and a
counter that is started and stopped by the IR
pulses. The count can be displayed on a LCD or LED display. This would allow for
close spacing of the sensors with very short times
from those speeders! Of course we all like to PLAY STAMPS so why not use a STAMP
anyway.
Date sent: Tue, 21 Mar 2000 16:15:18 -0600
From: jbabich@p...
To: basicstamps@egroups.com
Send reply to: basicstamps@egroups.com
Subject: [noparse][[/noparse]basicstamps] Clearing a latch, and a couple other basic
questions
> Hi everybody,
>
> I am currently building a speed trap to monitor traffic. I am using two
> ir sensors, which are not very fun to work with, that are connected to
> an SR latch which would then be hooked up to the pulsin function. When
> the first sensor is tripped it will change an input on the latch which
> would also make the output on the latch go to a one until the second
> sensor is tripped. This "pulse" would then be used as the pulsin
> input. When I start up my BS2 I would like to intially set both input
> states to 0 0 and have an output of 0 on my latch. How would I go about
> doing this in my code? Better yet can I even do this with the stamp?
>
> Also is there a way to monitor the battery that is used to supply the
> stamp?
>
> Could I use the 5 V output on the stamp to supply my latch chip, two IR
> emitters, and two IR receivers? I guess overall how much current can I
> draw from the stamp?
>
> thanks,
> babz
>
>
>
>
>
>
>
> -- 20 megs of disk space in your group's Document Vault
> -- http://www.egroups.com/docvault/basicstamps/?m=1
>
>
ron... the motor man...
Ronald Doctors
http://www.members.home.net/rdoctors
quite sure what you meant by "How far apart are your
sensors as if the distance is large enough you could possibly use the STAMP."
Wouldn't the distance need to be shorter to be able to
use the stamp.
I am still curious how I can initialize my latch and sensor using the stamp when
I start up the system.
babz
Ronald Doctors wrote:
> are you trying to make a speed monitoring system?
> How far apart are your sensors as if the distance is large enough you could
possibly use the STAMP
> for everything.
> There are lots of ways to do this so i expect that you'll have many ideas
> from our STAMPERS!
> I would probably not use a STAMP since all you need is a pulse generator and a
counter that is started and stopped by the IR
> pulses. The count can be displayed on a LCD or LED display. This would allow
for close spacing of the sensors with very short times
> from those speeders! Of course we all like to PLAY STAMPS so why not use a
STAMP anyway.
>
> Date sent: Tue, 21 Mar 2000 16:15:18 -0600
> From: jbabich@p...
> To: basicstamps@egroups.com
> Send reply to: basicstamps@egroups.com
> Subject: [noparse][[/noparse]basicstamps] Clearing a latch, and a couple other
basic questions
>
> > Hi everybody,
> >
> > I am currently building a speed trap to monitor traffic. I am using two
> > ir sensors, which are not very fun to work with, that are connected to
> > an SR latch which would then be hooked up to the pulsin function. When
> > the first sensor is tripped it will change an input on the latch which
> > would also make the output on the latch go to a one until the second
> > sensor is tripped. This "pulse" would then be used as the pulsin
> > input. When I start up my BS2 I would like to intially set both input
> > states to 0 0 and have an output of 0 on my latch. How would I go about
> > doing this in my code? Better yet can I even do this with the stamp?
> >
> > Also is there a way to monitor the battery that is used to supply the
> > stamp?
> >
> > Could I use the 5 V output on the stamp to supply my latch chip, two IR
> > emitters, and two IR receivers? I guess overall how much current can I
> > draw from the stamp?
> >
> > thanks,
> > babz
> >
> >
> >
> >
> >
> >
> >
> > -- 20 megs of disk space in your group's Document Vault
> > -- http://www.egroups.com/docvault/basicstamps/?m=1
> >
> >
>
> ron... the motor man...
> Ronald Doctors
> http://www.members.home.net/rdoctors
>
>
> -- 20 megs of disk space in your group's Document Vault
> -- http://www.egroups.com/docvault/basicstamps/?m=1
straight logic chips.
I guess that means the sensors would be further apart for a STAMP so the time
interval you are measuring
is within the STAMP limits.
If you are going to use the STAMP just for the speed check then I think you'll
be oK with aloop that keeps looking for
the sensors, starting a count for the first one and then ending the count and
outputing the count with suitable conversion to give you a
speed reading.
Date sent: Thu, 23 Mar 2000 20:06:50 -0600
From: jbabich@p...
To: basicstamps@egroups.com
Send reply to: basicstamps@egroups.com
Subject: [noparse][[/noparse]basicstamps] Re: Clearing a latch, and a couple other basic
questions
> I am trying to make a speed monitoring system. I have to use a stamp. I'm not
quite sure what you meant by "How far apart are your
> sensors as if the distance is large enough you could possibly use the STAMP."
Wouldn't the distance need to be shorter to be able to
> use the stamp.
>
> I am still curious how I can initialize my latch and sensor using the stamp
when I start up the system.
>
> babz
>
>
>
> Ronald Doctors wrote:
>
> > are you trying to make a speed monitoring system?
> > How far apart are your sensors as if the distance is large enough you could
possibly use the STAMP
> > for everything.
> > There are lots of ways to do this so i expect that you'll have many ideas
> > from our STAMPERS!
> > I would probably not use a STAMP since all you need is a pulse generator and
a counter that is started and stopped by the IR
> > pulses. The count can be displayed on a LCD or LED display. This would allow
for close spacing
of the sensors with very short times
> > from those speeders! Of course we all like to PLAY STAMPS so why not use a
STAMP anyway.
> >
> > Date sent: Tue, 21 Mar 2000 16:15:18 -0600
> > From: jbabich@p...
> > To: basicstamps@egroups.com
> > Send reply to: basicstamps@egroups.com
> > Subject: [noparse][[/noparse]basicstamps] Clearing a latch, and a couple other
basic questions
> >
> > > Hi everybody,
> > >
> > > I am currently building a speed trap to monitor traffic. I am using two
> > > ir sensors, which are not very fun to work with, that are connected to
> > > an SR latch which would then be hooked up to the pulsin function. When
> > > the first sensor is tripped it will change an input on the latch which
> > > would also make the output on the latch go to a one until the second
> > > sensor is tripped. This "pulse" would then be used as the pulsin
> > > input. When I start up my BS2 I would like to intially set both input
> > > states to 0 0 and have an output of 0 on my latch. How would I go about
> > > doing this in my code? Better yet can I even do this with the stamp?
> > >
> > > Also is there a way to monitor the battery that is used to supply the
> > > stamp?
> > >
> > > Could I use the 5 V output on the stamp to supply my latch chip, two IR
> > > emitters, and two IR receivers? I guess overall how much current can I
> > > draw from the stamp?
> > >
> > > thanks,
> > > babz
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > -- 20 megs of disk space in your group's Document Vault
> > > -- http://www.egroups.com/docvault/basicstamps/?m=1
> > >
> > >
> >
> > ron... the motor man...
> > Ronald Doctors
> > http://www.members.home.net/rdoctors
> >
> >
> > -- 20 megs of disk space in your group's Document Vault
> > -- http://www.egroups.com/docvault/basicstamps/?m=1
>
>
>
> eGroups.com Home: http://www.egroups.com/group/basicstamps/
> http://www.egroups.com - Simplifying group communications
>
>
ron... the motor man...
Ronald Doctors
http://www.members.home.net/rdoctors
>stamp. I'm not quite sure what you meant by "How far apart are your
>sensors as if the distance is large enough you could possibly use
>the STAMP." Wouldn't the distance need to be shorter to be able to
>use the stamp.
>
>I am still curious how I can initialize my latch and sensor using
>the stamp when I start up the system.
>
>babz
If I understand what you're trying to do, one of the gurus
(Jon Williams?) wrote an article for Nuts & Volts a couple
of years ago. It was an elegant STAMP solution to timing
slot car/pinewood derby type races. Parallax and N&V both
have archives; it's probably in there somewhere.
Reg Neale