The responsibility of the LED task is to light up the LEDs that belong to the pushed
buttons and to turn off the LEDs of the buttons that are not pushed. The LED will be lit
for as long as the button is held down. The information about the recent button events
is received through the led_queue. As mentioned in the previous
section, it is the main task that sends to this queue. Refer to the figure below for the
UML diagram.
Figure 1. LED Task
