Interfacing a synchronous counter - need ur help.

[nattynathan]

hi friends,

I need ur help. I am trying implementing a pyroelectric detector/sensor
(dual element) which detects the movement of ppl in and out of a
secured building. the link below shows the circuit diagram for the
motion detector. only one person enters or leaves the building at a
time.

http://www.glolab.com/pirparts/appckt.pdf

Now, I want to couple a counter which counts the number of ppl inside
the building. so I have decided to use an
UP/DOWN SYNCHRONOUS COUNTER, cud someone help me how to make this a
continuous process, so that that counter increments and decrements wen
someone moves in or out of the building.

I need ur advise (asap!!) in the interface part. how shud I proceed to
interface the above circuit whith the sync. counter.

I wud really appreciate ur help. thank you.

Natty.

 

[Mochuelo]

On 26 Jul 2005 03:23:38 -0700, "nattynathan"
<Raghunathan.Appavou@gmail.com> wrote:

hi friends,

I need ur help. I am trying implementing a pyroelectric detector/sensor
(dual element) which detects the movement of ppl in and out of a
secured building. the link below shows the circuit diagram for the
motion detector. only one person enters or leaves the building at a
time.

http://www.glolab.com/pirparts/appckt.pdf

I'll assume you have a circuit like this at the entrance and another,
identical one, at the exit (because, of course, one single circuit
like this cannot tell whether a person is entering or leaving the
building).

Now, I want to couple a counter which counts the number of ppl inside
the building. so I have decided to use an
UP/DOWN SYNCHRONOUS COUNTER, cud someone help me how to make this a
continuous process, so that that counter increments and decrements wen
someone moves in or out of the building.

I need ur advise (asap!!) in the interface part. how shud I proceed to
interface the above circuit whith the sync. counter.

I would not use an up/down counter. I would use a small and cheap MCU
(maybe even 8-pin), and get rid of the two relays, and the two CD4538
ICs. If you need isolation, have it after the MCU, and with two
optocouplers. The MCU can do the function of the 4538 (monostable),
can count up/down and, if you choose it with internal EEPROM, can keep
the count information even when there is no supply.

I wud really appreciate ur help. thank you.

Natty.

 

[Chris]

nattynathan wrote:

hi friends,

I need ur help. I am trying implementing a pyroelectric detector/sensor
(dual element) which detects the movement of ppl in and out of a
secured building. the link below shows the circuit diagram for the
motion detector. only one person enters or leaves the building at a
time.

http://www.glolab.com/pirparts/appckt.pdf

Now, I want to couple a counter which counts the number of ppl inside
the building. so I have decided to use an
UP/DOWN SYNCHRONOUS COUNTER, cud someone help me how to make this a
continuous process, so that that counter increments and decrements wen
someone moves in or out of the building.

I need ur advise (asap!!) in the interface part. how shud I proceed to
interface the above circuit whith the sync. counter.

I wud really appreciate ur help. thank you.

Natty.

Hi, Natty. I would guess you're going to be waiting a while for Ur
help. The city has been uninhabited since about 500 B.C.

http://en.wikipedia.org/wiki/Ur

But you sound like you're in a big hurry, and can't wait for help from
Ur (you must be positively frantic to be using cell phone text in a
newsgroup). You should have a Velleman Multifunctional Up/Down Counter
(K8035) Fed-Exed to your location as soon as possible, and just
construct it yourself. They're $37.90 USD at Circuit Specialists, and
are available from many distributors worldwide. Be sure to download
the user manual, which explains the limitations and features of the
counter. It's got four digits, will totalize up and down, has voltage
as well as contact inputs, and will run off 9 to 12VDC at 150mA. Just
use a 9VDC wall wart, and you're good to go.

If you want a cool-looking, completed display, get the VM-107 kit,
which includes a cute bezel for that finished look. I would guess
they're a bit more expensive, and aren't available from as many
sources.

http://www.velleman.be/
http://www.circuitspecialists.com/prod.itml/icOid/8449

If you're in a bigger hurry, just go down to the local Grainger and buy
a totalizing counter. It'll cost you more, but you'll have a solution
up and running today.

Good luck with the fire
Chris

 

[nattynathan]

hiii friends,

thank u for handy infos. will get back to you soon. thanx again.

Natty

Mochuelo wrote:

On 26 Jul 2005 03:23:38 -0700, "nattynathan"
Raghunathan.Appavou@gmail.com> wrote:


hi friends,

I need ur help. I am trying implementing a pyroelectric detector/sensor
(dual element) which detects the movement of ppl in and out of a
secured building. the link below shows the circuit diagram for the
motion detector. only one person enters or leaves the building at a
time.

http://www.glolab.com/pirparts/appckt.pdf

I'll assume you have a circuit like this at the entrance and another,
identical one, at the exit (because, of course, one single circuit
like this cannot tell whether a person is entering or leaving the
building).


Now, I want to couple a counter which counts the number of ppl inside
the building. so I have decided to use an
UP/DOWN SYNCHRONOUS COUNTER, cud someone help me how to make this a
continuous process, so that that counter increments and decrements wen
someone moves in or out of the building.

I need ur advise (asap!!) in the interface part. how shud I proceed to
interface the above circuit whith the sync. counter.

I would not use an up/down counter. I would use a small and cheap MCU
(maybe even 8-pin), and get rid of the two relays, and the two CD4538
ICs. If you need isolation, have it after the MCU, and with two
optocouplers. The MCU can do the function of the 4538 (monostable),
can count up/down and, if you choose it with internal EEPROM, can keep
the count information even when there is no supply.



I wud really appreciate ur help. thank you.

Natty.