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