#include <SoftwareSerial.h>
#define rxPin 1
#define txPin 2
#define sensor 2
SoftwareSerial mySerial(rxPin, txPin);

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

void loop() {
  // put your main code here, to run repeatedly:
  int value = analogRead(sensor);
  value = map(value, 0, 1023, 0, 255);
  mySerial.println(value);
}