Create a four-digit stopwatch on your Blackboard, using the seven-segment display as an output device. The stopwatch should count from 0.000 to 9.999 seconds and then roll over, with the count value updating exactly once per millisecond. The stopwatch uses three pushbutton inputs: start, stop, increment, and clear (reset). The start input causes the stopwatch to begin incrementing at a 1KHz clock rate (i. e., one count per millisecond); the stop input stops the counter from incrementing but leaves the display showing the current counter value; the increment input causes the displayed value to increment once each time the button is pressed regardless of how long the increment button is held down; and the reset/clear input forces the counter value to zero.