| /* | |
| 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, put the board and sensor in a well-lit room, | |
| open the Serial Monitor, 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. | |
| https://www.arduino.cc/en/Tutorial/BuiltInExamples/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 | |
| } | |