====== T01 - Light snake ======

Make an effect of "light snake" on the [[courses:be2m37mam:hardware:shield|Experimental shield]].

LEDs are connected to following pins:

    LED D1 – PA5 (GPIOA5 - the same like built-in green LED)
    LED D2 – PA6 (GPIOA6)
    LED D3 – PA7 (GPIOA7)
    LED D4 – PB6 (GPIOB6)

===== Instructions =====

  - Don't forget to enable clock for GPIOB
  - 
  - Change LED pattern with approx. 1s interval. Use delay function from previous lecture.

===== Possible improvements =====

  - Use button S1 on the Experimental shield to change speed (press S1 to faster change, release to normal speed).
  - Use button S2 on the Experimental shield to change pattern.