A great intro sketch for writing analog sensor data to the serial bus.

Analog_Read_Serial_Write.ino

/*
An Arduino sketch that reads an analog input from pin A0 and writes a '0' or '1' to the serial bus.
*/
void setup() {

  Serial.begin(9600);
  Serial.println("SERIAL READY");


}

void loop() {
  int sensorValue = analogRead(A0);
  Serial.println(sensorValue);
  delay(50);
}