How can I build an electronic tally counter? I want to count how often a door...

  • Thread starter Thread starter demistuff
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demistuff

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...is opened.? I want to build a tally counter since I can't find one commercially available. I'm thinking about doing something that has a sensor attached to a door and a detector on the wall which counts everytime the two are separated. Maybe w/ magnets or something. Any thoughts? I have minimal experience w/ electronics.
 
If you have limited experience it might be a task to much to handle. The sensor could control a digital counter. The sensor would act like a push button incrementing the counter every time the door is open. There are methods of displaying the number with a 7 segment LED display.

I'd use a microcontroller, but it takes a long time to grasp this method.
 
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