const int L_LED = 13;   
const int encoderA = 2; 
const int encoderB = 3; 
const int SW = 4; 

int laststateA;
int laststateSW;
long cnt = 0;
        
void setup() {
	pinMode(L_LED, OUTPUT);
	pinMode(encoderA ,INPUT);
	pinMode(encoderB ,INPUT);
	pinMode(SW, INPUT_PULLUP);    
	laststateA = digitalRead(encoderA);
	laststateSW = digitalRead(SW);
	Serial.begin(9600);
}


void loop() {
	int stateA = digitalRead(encoderA);

	if(stateA != laststateA){
		int stateB = digitalRead(encoderB);

		if(stateA == LOW && stateB == HIGH){
			cnt++;
			Serial.print(" Rotated clockwise << ");   
			Serial.print(cnt); 
		}
		if(stateA == LOW && stateB == LOW){
			cnt--;
			Serial.print(" Rotated clockwise << ");   
			Serial.print(cnt); 
		}    
		laststateA = stateA;
	}


	int SW_state = digitalRead(SW);
	if(laststateSW != SW_state)
	 {
		if (SW_state == LOW) 
		{ 
			cnt = 0;
			Serial.println("cnt reset "); 
			Serial.println(cnt); 
		}
		else
		{
			Serial.println("now sw is opend!")
		}
		laststateSW = SW_state;
	}
}
//counterwise 반시계가 되는거 고치기
//실제 dc모터가아니라 이런 현상 발생