add arduino-0018-linux (32 bit)

arduino-0018-linux/examples/Display/barGraph/barGraph.pde

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+/*
+  LED bar graph
+ 
+  Turns on a series of LEDs based on the value of an analog sensor.
+  This is a simple way to make a bar graph display. Though this graph
+  uses 10 LEDs, you can use any number by changing the LED count
+  and the pins in the array.
+  
+  This method can be used to control any series of digital outputs that
+  depends on an analog input.
+ 
+  The circuit:
+   * LEDs from pins 2 through 11 to ground
+ 
+ created 26 Jun 2009
+ by Tom Igoe 
+ 
+ http://www.arduino.cc/en/Tutorial/BarGraph
+ */
+
+
+// these constants won't change:
+const int analogPin = 0;    // the pin that the potentiometer is attached to
+const int ledCount = 10;    // the number of LEDs in the bar graph
+
+int ledPins[] = { 
+  2, 3, 4, 5, 6, 7,8,9,10,11 };   // an array of pin numbers to which LEDs are attached
+
+
+void setup() {
+  // loop over the pin array and set them all to output:
+  for (int thisLed = 0; thisLed < ledCount; thisLed++) {
+    pinMode(ledPins[thisLed], OUTPUT); 
+  }
+}
+
+void loop() {
+  // read the potentiometer:
+  int sensorReading = analogRead(analogPin);
+  // map the result to a range from 0 to the number of LEDs:
+  int ledLevel = map(sensorReading, 0, 1023, 0, ledCount);
+
+  // loop over the LED array:
+  for (int thisLed = 0; thisLed < ledCount; thisLed++) {
+    // if the array element's index is less than ledLevel,
+    // turn the pin for this element on:
+    if (thisLed < ledLevel) {
+      digitalWrite(ledPins[thisLed], HIGH);
+    } 
+    // turn off all pins higher than the ledLevel:
+    else {
+      digitalWrite(ledPins[thisLed], LOW); 
+    }
+  }
+}
+
+
+