int sensorPin = 0;    // select the input pin for the potentiometer
int motor1Pin = 6;    // pin 2 on L293D
int motor2Pin = 7;    // pin 7 on L293D
int motor3Pin = 8;    // pin 15 on L293D
int motor4Pin = 9;    // pin 10 on L293D
int valve1Pin = 4;    // pin 15 on L293D
int valve2Pin = 3;    // pin 10 on L293D
int sensorValue;  // variable to store the value coming from the sensor
int ledPin = 11;
int motor1SpeedPin = 10;

void setup() {
  pinMode(ledPin,OUTPUT);
  pinMode(motor1Pin, OUTPUT);
  pinMode(motor2Pin, OUTPUT);
  pinMode(motor3Pin, OUTPUT);
  pinMode(motor4Pin, OUTPUT);
  pinMode(valve1Pin, OUTPUT);
  pinMode(valve2Pin, OUTPUT);
  Serial.begin(9600);
  Serial.println("hello world");
}

void loop() {




  // read the value from the sensor:
  sensorValue = analogRead(sensorPin);    
  Serial.println(sensorValue);
  analogWrite(ledPin,sensorValue/4);


  if (sensorValue > 0) {

  }


  if (Serial.available()) {
    int dataIn = Serial.read();

    switch(dataIn) {
    case 49:
      rotateCWmotor1();
      delay(sensorValue/10);
      stopMotor1();

      break;
    case 50:
      rotateACWmotor1();
      delay(sensorValue/10);
      stopMotor1();

      break;
    case 51:
      activateSolenoid(); 

      break;

    case 52:
      rotateCWmotor2();
      delay(sensorValue/10);
      stopMotor2();

      break;

    case 53:
      rotateACWmotor2();
      delay(sensorValue/10);
      stopMotor2();

      break;

    }

  }
  delay(10);
}

void activateSolenoid() {
  digitalWrite(valve1Pin,LOW);
  delay(1000);
  digitalWrite(valve1Pin,HIGH);
}

void rotateCWmotor1 () {
  digitalWrite(motor1Pin, LOW);   // set pin 0 on L293D low
  digitalWrite(motor2Pin, HIGH);  // set pin 7 on L293D high
}
void rotateACWmotor1 () {
  digitalWrite(motor1Pin, HIGH);   // set pin 0 on L293D low
  digitalWrite(motor2Pin, LOW);  // set pin 7 on L293D high
}

void stopMotor1 () {
  digitalWrite(motor1Pin, LOW);   // set pin 0 on L293D low
  digitalWrite(motor2Pin, LOW);  // set pin 7 on L293D high

}
void rotateCWmotor2 () {
  digitalWrite(motor3Pin, LOW);   // set pin 0 on L293D low
  digitalWrite(motor4Pin, HIGH);  // set pin 7 on L293D high
}
void rotateACWmotor2() {
  digitalWrite(motor3Pin, HIGH);   // set pin 0 on L293D low
  digitalWrite(motor4Pin, LOW);  // set pin 7 on L293D high
}

void stopMotor2 () {
  digitalWrite(motor3Pin, LOW);   // set pin 0 on L293D low
  digitalWrite(motor4Pin, LOW);  // set pin 7 on L293D high

}