Arduino Tact Switch count or 5v Pan PWM Control

 
int buttonPushCounter = 0;
int buttonState = 0;
int lastButtonState = 0;
 
void setup() {
 // 시리얼 모니터 및 사용 핀 설정
  Serial.begin(9600);
pinMode(3, INPUT_PULLUP);
pinMode(7, OUTPUT);
}
 
void loop() {
   
     buttonState = digitalRead(3);
   //버튼 카운터를 위한 설정
  if (buttonState != lastButtonState) {
 
    if (buttonState == LOW) {
      if(buttonPushCounter<=3 &&mode==0)
      {
      buttonPushCounter++;
      if(buttonPushCounter==4){
      buttonPushCounter--;
          mode=1;
      }
      }
      if(buttonPushCounter>=0 &&mode==1){
        buttonPushCounter--;
        if(buttonPushCounter==0)
              mode=0;
        }
      
    }
 
    delay(50);
  }
 
  lastButtonState = buttonState;
  //버튼 카운터별 pwm 
 if(buttonPushCounter==1){
  Serial.println("약");
    analogWrite (7, 100); 
 
 }
 if(buttonPushCounter==2){
  Serial.println("중");
  analogWrite (7, 190); 
 }
 if(buttonPushCounter==3){
  Serial.println("강");
  analogWrite (7, 255); 
 }
 if(buttonPushCounter==0){
  Serial.println("끄기");
  analogWrite (7, 0); 
 }
 
}