How do I correctly implement a photoresistor to control the led brightness between dim, normal and bright. Also implement a push button that will control the buzzer volume to $3$different levels. High$-$level packaged Arduino libraries, Arduino header files, and codes are not allowed. Only use these libraries: avr$/$io$.$h$,$ util$/$delay$.$h$,$stdlib.h$,$ math.h$,$avr$/$interrupt$.$h$.$ The code below is what I currently have for the photoresistor.