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Published on Dec 15, 2012
Demonstration of final project for EECT 112, Digital Fundamentals. External clock drives a timer circuit. Time input as BCD with switches. A 9th switch determines up/down count, which is indicated by green or red LED, respectively. When push button is pressed, the time input is displayed and another red LED indicates timer has begun. When the terminal value is reached, the red activity LED goes out and a green one comes on to indicate the timer has been reset.