const int sensorMin=0;
const int sensorMax=1023;

void setup() {
Serial.begin(9600);

}

void loop() {
  int sensorReading=analogRead(A0);
  int range=map(sensorReading,sensorMin,sensorMax,0,3);

switch (range) {
case 0: 
Serial.println("Nhan");
break;
case 1:
Serial.println("Nguyen");
break;
case 2: 
Serial.println("Tri");
break;
case 3: 
Serial.println("Dung");
break;

}

delay(100); 
}