| /* |
| 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 |
| } |
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