int sensorPin = A0;   // select the input pin
int sensorValue = 0;  // variable to store the value coming from the sensor

int rawHigh = 250;
int rawLow = 1023;
int toHigh = 0;
int toLow = 100;

void setup() {
  Serial.begin(2000000); // initialise serial communication at this baud rate
}

void loop() {
  sensorValue = analogRead(sensorPin); // read the value from sensorPin to sensorValue
  
  sensorValue = map(sensorValue, rawLow, rawHigh, toLow, toHigh);
  sensorValue = constrain(sensorValue, 0, 100);
  
  Serial.println(sensorValue); // print sensorValue
  delay(100); // wait 1/10 of a second
}