Design the HW and SW of an embedded system that has two push buttons that should

be connected to the INT$0$ and INT$1$ pins in the Arduino board. The push buttons should

be debounced in software without using any delay function. Every time one push button

is pressed the microntroller should increase the duty cycle of a PWM signal that will

used to increase the luminosity of an LED connected to the arduino board in steps of

$28$ from $0$ to $255.$ Pressing the other push button will decrease the duty cycle and the

luminosity of the LED in steps of $28.$ You should include one $7-$segment display that will

be updated by your program every time the duty cycle is increased or decreased from $0$

to $9$ or viceversa. Figure shows the block diagram of the system. Your program should

not use any Arduino$-$style library or delay except to generate the PWM signal.