const int sensorMin = 0;    // sensor minimum, discovered through experiment
const int sensorMax = 600;  // sensor maximum, discovered through experiment

void setup() {
  // initialize serial communication:
  Serial.begin(9600);
pinMode(13, OUTPUT);
pinMode(12, OUTPUT);
pinMode(11, OUTPUT);
pinMode(10, OUTPUT);
}

void loop() {
  // read the sensor:
  int sensorReading = analogRead(A0);
  // map the sensor range to a range of four options:
  int A = map(sensorReading, sensorMin, sensorMax, 0, 3);

  // do something different depending on the range value:
  switch (A) {
    case 0:  // your hand is on the sensor
      Serial.println("OFF MOTOR");
      digitalWrite(13, LOW);
      digitalWrite(12, LOW);
      digitalWrite(11, LOW);
      digitalWrite(10, LOW);
      break;
    case 1:  // your hand is close to the sensor
      Serial.println("MOTOR KEKANAN");
      digitalWrite(13, LOW);
      digitalWrite(12, LOW);
      digitalWrite(11, HIGH);
      digitalWrite(10, LOW);
      break;
    case 2:  // your hand is a few inches from the sensor
      Serial.println("MOTOR KEKIRI");
      break;
    case 3:  // your hand is nowhere near the sensor
      Serial.println("OFF MOTOR");
      break;
  }
  delay(1000);  // delay in between reads for stability
}