利用I2C通訊傳輸界面，將按鍵SW3觸發次數記錄於外部EEPROM元件24AA04，並於按鍵SW2觸發時將觸發次數歸零-Using I2C communication transmission interface, the number of recorded keystrokes SW3 trigger external EEPROM device 24AA04, the number of zero when the trigger and trigger on the button SW2