int analogPin = A0;
int ledPin = 9;

int val = 0; //variable for sensor value

void setup() {
  Serial.begin(9600); //initialize serial communication
  //analogMode(analogPin, INPUT);
  pinMode(ledPin, OUTPUT);
}

void loop() {
  val = analogRead(analogPin); //reading analog value

  //use small delay between analogRead function for diff sensors
  //allow the ADC a moment to catch up
  delay(10);

  Serial.print("flex sensor: ");
  Serial.println(val); //print to serial monitor

  analogWrite(ledPin, val / 4);
}