const int analogInPin = A0;
const int analogOutPin = 9;
int sensorValue = 0;
int outputValue = 0;

void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
sensorValue = analogRead(analogInPin);
outputValue = map(sensorValue, 0, 1023, 0, 255);
analogWrite(analogOutPin, outputValue);
Serial.print("sensor=");
Serial.print(sensorValue);
Serial.print("\t output=");
Serial.print(outputValue);
delay(1000);
}