Demos:

    The demo example 04.01 reads the analog value from the potentiometer and changes the period of blinking acording to the value.
    The demo example 02.02 show the way the timers are used in conjunction with the interrupts

a)
  * write a program, that will read the analog value from the potentiometer
  * if the value is less then 127, blink the green LED; if the value is equal or bigger to 127, blink the red LED.

b1) write a program, that will turn on both LEDs and change the intensity using PWM

b2) extend the program so that the intensity is changed using the potentiometer

b3) extend the program so that the intensity is changet separately for individual LEDs, use the pushbutton to select active LED

b4) store the current intensity settings to the EEPROM