利用類比數位訊號轉換模組的量測可變電阻的電壓值，并將轉換的結果以8位元的方式呈現在LED發光二極體顯示。同時以此8位元結果作為CCP1的PWM模組之工作週期設定值，產生一個頻率為4000Hz的可調音量蜂鳴器週期波-The amount of use of analog to digital signal conversion module voltage values ​ ​ measured variable resistor, and converts the result to an 8-bit presented in LED light emitting diode display. As a result of this eight yuan while working CCP1 PWM cycle setting module to generate a frequency of 4000Hz adjustable volume buzzer periodic waves of