arduino-0018-linux-x64

arduino-0018-linux-x64/examples/Control/IfStatementConditional/IfStatementConditional.pde

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+/*
+  Conditionals - If statement
+ 
+ This example demonstrates the use of if() statements.
+ It reads the state of a potentiometer (an analog input) and turns on an LED
+ only if the LED goes above a certain threshold level. It prints the analog value
+ regardless of the level.
+ 
+ The circuit:
+ * potentiometer connected to analog pin 0.
+ Center pin of the potentiometer goes to the analog pin.
+ side pins of the potentiometer go to +5V and ground
+ * LED connected from digital pin 13 to ground
+ 
+ * Note: On most Arduino boards, there is already an LED on the board
+ connected to pin 13, so you don't need any extra components for this example.
+ 
+ created 17 Jan 2009
+ by Tom Igoe
+ 
+  http://arduino.cc/en/Tutorial/
+ 
+ */
+ 
+// These constants won't change:
+const int analogPin = 0;     // pin that the sensor is attached to
+const int ledPin = 13;       // pin that the LED is attached to
+const int threshold = 400;   // an arbitrary threshold level that's in the range of the analog input
+
+void setup() {
+  // initialize the LED pin as an output:
+  pinMode(ledPin, OUTPUT);
+  // initialize serial communications:
+  Serial.begin(9600);
+}
+
+void loop() {
+  // read the value of the potentiometer:
+  int analogValue = analogRead(analogPin);
+
+  // if the analog value is high enough, turn on the LED:
+  if (analogValue > threshold) {
+    digitalWrite(ledPin, HIGH);
+  } 
+  else {
+    digitalWrite(ledPin,LOW); 
+  }
+
+  // print the analog value:
+  Serial.println(analogValue, DEC);
+
+}
+