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This is a physical hit counter.It used to count page-hits on the website instead of using software only.The counter will be connected to rs232 port through a few of electronic components that performs as a counter driver and power supply circuit.The counter that I used is a mechanical counter or electromagnetic counter model SC-212 which I get from an old coin-op game machine as show in the photo.As the counter’s nameplate specified, this counter requires 12VDC power supply, this means that it requires a 12V pulse to increase the counter by 1.Also,the in the nameplate show the maximum speed is 15 CPS, but I not use beyond this speed in my project. Read more