/* Switch statement Demonstrates the use of a switch statement. The switch statement allows you to choose from among a set of discrete values of a variable. It's like a series of if statements. To see this sketch in action, but the board and sensor in a well-lit room, open the serial monitor, and and move your hand gradually down over the sensor. The circuit: * photoresistor from analog in 0 to +5V * 10K resistor from analog in 0 to ground created 1 Jul 2009 modified 9 Apr 2012 by Tom Igoe This example code is in the public domain. http://www.arduino.cc/en/Tutorial/SwitchCase */ // these constants won't change. They are the // lowest and highest readings you get from your sensor: const int sensorMin = 0; // sensor minimum, discovered through experiment const int sensorMax = 600; // sensor maximum, discovered through experiment void setup() { // initialize serial communication: Serial.begin(9600); } void loop() { // read the sensor: int sensorReading = analogRead(A0); // map the sensor range to a range of four options: int range = map(sensorReading, sensorMin, sensorMax, 0, 3); // do something different depending on the // range value: switch (range) { case 0: // your hand is on the sensor Serial.println("dark"); break; case 1: // your hand is close to the sensor Serial.println("dim"); break; case 2: // your hand is a few inches from the sensor Serial.println("medium"); break; case 3: // your hand is nowhere near the sensor Serial.println("bright"); break; } delay(1); // delay in between reads for stability }