Objective: Learn how to perform discrete input and output operating in C. Experience with both seven-segment LED and keypad. Requires: E3 module, USB cable, PC, 3 x 4 keypad, seven-segment LED with resistors on each anode and wires to connect to the E3. Notes Steps/Technical Procedure 1. Write a program that will repeat the following actions a. Light the green LED and wait for a button press b. After the button is released, light just the yellow LED for 1 second c. Then light just the red LED for 1 second d. Finally turn off all LEDs and sound the buzzer with a 1-khz tone for 3 seconds The buzzer on this board is actually just a piezo speaker. To make a tone you must generate a 0 to 5V square wave to the device at the desired frequency. HINTS: Consider what must be done regarding debounce of the switch. Make sure the tone sounds right and is not half or double the desired frequency