54 lines
1.5 KiB
C++
54 lines
1.5 KiB
C++
/*
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Conditionals - If statement
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This example demonstrates the use of if() statements. It reads the
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state of a potentiometer (an analog input) and turns on an LED only
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if the LED goes above a certain threshold level. It prints the
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analog value regardless of the level.
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The circuit:
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* Potentiometer connected to pin 15.
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Center pin of the potentiometer goes to the Maple pin.
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Side pins of the potentiometer go to +3.3V and ground
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created 17 Jan 2009
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by Tom Igoe
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Ported to the Maple 27 May 2010
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by Bryan Newbold
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http://leaflabs.com/docs/lang/cpp/if.html
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*/
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// These constants won't change:
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const int analogPin = 15; // Pin that the sensor is attached to
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const int threshold = 400; // A random threshold level that's in
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// the range of the analog input
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void setup() {
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Serial.begin(115200); // Ignored by Maple. But needed by boards using hardware serial via a USB to Serial adaptor
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// Initialize the built-in LED pin as an output:
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pinMode(BOARD_LED_PIN, OUTPUT);
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// Initialize the potentiometer pin as an analog input:
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pinMode(analogPin, INPUT_ANALOG);
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}
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void loop() {
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// Read the value of the potentiometer:
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int analogValue = analogRead(analogPin);
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// If the analog value is high enough, turn on the LED:
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if (analogValue > threshold) {
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digitalWrite(BOARD_LED_PIN, HIGH);
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}
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else {
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digitalWrite(BOARD_LED_PIN, LOW);
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}
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// Print the analog value:
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Serial.println(analogValue, DEC);
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}
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