#define led 13

enum {sample_state,high_state,low_state};				//Enumerate(give values to) the variables so they are 0,1,2 respectivly
unsigned int state=sample_state;
unsigned int val1,val2,val3,mVal,hiVal,loVal;
unsigned int timer;

/*----------------------------------------Main loop--------------------------------------*/
void setup() {
	Serial.begin(115200);
	pinMode(13,OUTPUT);
}

void loop() {
	switch(state){									//There are 3 different states that take place, take sample from inputs, set high duration, set low duration
		case sample_state:
			val1 = analogRead(pwmPin);
			val2 = 1023 -analogRead(pwmPin);
			val3 = analogRead(freqPin);

			mVal = map(Val3,0,1023,60,2000); 		//Mapped from 60-2000millisec
			hiVal = map(Val1,0,1023,0,mVal);
			loVal = map(Val2,0,1023,0,mVal) +1;
			
			bpm = (2000 / mVal) * tempoMin; 		// tempoMin = 30
			Serial.print(bpm);
			
			state=high_state;						//We have inputs, next we go on to high state mode
			digitalWrite(led,HIGH);					//Set the pin high as the next state is just a timer
			timer=millis();							//Set timer to the time when this code block finishes
			break;
		case high_state:									
			if(millis()>=timer+hiVal){				//Sit in this state until the timer threashold reaches the end of the high state	
			  state=state_low;						//Move on to low state tmer
			  digitalWrite(led,LOW);				//Set pin low
			  timer=millis();						//Reset timer
			}
			break;
		case low_state:				
			if(millis()>=timer+loVal){				//Sit in this state until the timer threashold reaches end of the low state
			  state=state_sample;					//Cycle completed, go back to taking a new sample and repeat cycle
			}
			break;
		default:									//This should never happen
			Serial.println("state variable not valid");
			while(1);
			break;
	}
	//The rest of your code can go here and will be executed every loop cycle
}