/*
 * one pot fades one motor
 * modified version of AnalogInput
 * by DojoDave <http://www.0j0.org>
 * http://www.arduino.cc/en/Tutorial/AnalogInput 
 * Modified again by dave
 */

int potPin = 0;   // select the input pin for the potentiometer
int motorPin = 9; // select the pin for the Motor
int val = 0;      // variable to store the value coming from the sensor
char serialInArray[100];
int minuteDelay;
boolean alarmSet = false;

void setup() {
  Serial.begin(9600);
  
}
void loop() {
  readSerialString(serialInArray, 100);
  processSet();
  delay(minuteDelay * 2 * 1000);
  //val = analogRead(potPin);    // read the value from the sensor, between 0 - 1024
  //Serial.println(val);
  if(alarmSet == true) {
    Serial.println("Buzzing alarm");
  for(int i=50; i< 255; i+=50)
  {
    analogWrite(motorPin, i); // analogWrite can be between 0-255
    delay(5000);
    readSerialString(serialInArray, 100);
    processOff();
  }
  analogWrite(motorPin, 0);
  alarmSet = false;
  }
}

void processSet() {
  int valueRead;
  valueRead = serialInArray[0];
  if(valueRead == 0) {
    analogWrite(motorPin, 0);
  }
  else {
   minuteDelay = atoi(serialInArray);
   Serial.print("An alarm is set to buzz you in ");
   Serial.print(minuteDelay);
   Serial.println("minutes"); 
   alarmSet = true;
  }
}

void processOff() {
  int valueRead;
  valueRead = serialInArray[0];
  if(valueRead == ' ' || valueRead == 0) {
    analogWrite(motorPin, 0);
  }
}

void readSerialString (char *strArray, int maxLength) {
  int i = 0;

  if(!Serial.available()) {
    return;
  }
  while (Serial.available() && i < maxLength) {
    strArray[i] = Serial.read();
    i++;
  }
}

void resetSerialString (char *strArray, int length) {
  for (int i = 0; i < length; i++) {
    strArray[i] = '\0';
  }
}