Simple circuit completion counter

[mikeusru]

I need a device with something like a 4-digit LCD or LED display which counts the amount of times its input and output contacts close. Basically, 1 count for each completed circuit. I was told things like these exist and are cheap, but don't know what to call it.

Thanks in advance!

 

[Sakha]

You should take a look at the 4029 counter IC.
Also you might like to see this website that shows http://www.aaroncake.net/circuits/counter.asp"

 

[berkeman]

I need a device with something like a 4-digit LCD or LED display which counts the amount of times its input and output contacts close. Basically, 1 count for each completed circuit. I was told things like these exist and are cheap, but don't know what to call it.

Thanks in advance!

Here are the results of doing a Google Images search on LED Counter Module:

http://www.google.com/images?rlz=1T...ule&um=1&ie=UTF-8&source=og&sa=N&hl=en&tab=wi

.

 

[Bob S]

You probably should precede your counter with a bounceless switch. See posts #2 and #5 in

https://www.physicsforums.com/showthread.php?p=2675279

Bob S

 

[mheslep]

Or, if there is a controller / processor in the loop you can save a little hardware and debounce in the firmware/software:

Consider the simplest of all debouncing strategies: read the switch once every 500ms or so, and set a flag indicating the input's state. No reasonable switch will bounce that long. A read during the initial bounce period returns a zero or a one indicating the switch's instantaneous state. No matter how we interpret the data (in other words, switch on or off) the result is meaningful. The slow read rate keeps the routine from deducing that bounces are multiple switch closures.

http://www.eetimes.com/discussion/break-point/4024981/My-favorite-software-debouncers

 

[mikeusru]

Thanks for the help!
So with something like
http://www.quasarelectronics.com/3129-up-down-4-digit-led-event-counter.htm

How would I be able to tweak it to be sensitive enough to respond to skin conduction as a part of the circuit (basically, count a contact with a resistance of over 1k Ohms)?