Need some advice for building an event counter

[Joe]

I am going to try and build an event counter (using a 2 digit, 7 segment LED
p/n LD5111-11, jameco pn=24723). I will be counting the number of times a
PIR sensor is activated. The sensor closes a relay when it is activated, so
I think I will probably need to debounce that signal. It can either be a
high or low. I will probly use a 555 set up as a oneshot to send the pulse
to the next stage. The next stage is where I am confused. This device will
be battery powered (4.5V to 9V) btw.

I have been looking at the cmos 4033(divide by 10 counter with 7 segment
output) , 4511(7 segment latch and driver), and the 74c48 (bcd to segment
disp driver). I am not sure which one to use. If I use the 74c48, I will
need a bcd counter before it (I think??). If I use either of the other 2, I
would need to put drivers into another stage to drive the LED's as these
IC's do not source enough current to drive an LED.

If anyone has built something like this, has any suggestions or knows of a
site I can visit to get some ideas, pls advise. I have googled for 'event
counter' and 'simple event counter' and found some ideas, but they are for
one digit displays.All ideas or info is welcome. I already have 2 jameco 7
segment dual digit displays and I wanted to use them for this application. I
am not sure how to count the pulses and then convert them to be able to see
them on the display.

TIA,
Joe

 

[Jamie]

form what i can see you need the 4033 and 4511
you actually don't need the latch in this case so that pin
can be held low.

 

[Joe]

form what i can see you need the 4033 and 4511
you actually don't need the latch in this case so that pin
can be held low.

Hi Jamie,

Thanks, I will be placing an order with mouser soon, once I figure out what
else I need.

Joe