Differences

This shows you the differences between two versions of the page.

--- arduino:arduino_crash_course:analog_output [2012/11/06 00:20] – created mithat
+++ arduino:arduino_crash_course:analog_output [2012/11/06 00:27] – [Example] mithat
@@ Line 12: / Line 12: @@
 The following is an example of using PWM to ramp-up the brightness of an LED using a timer.
+The example below (taken verbatim from the [[http://arduino.cc/en/Tutorial/Fade|Arduino Fade]] page) is an example of using Arduino's PWM to ramp-up and down the brightness of an LED using a timer.
+<file c Fade.ino>
+/*
+ Fade
+ This example shows how to fade an LED on pin 9
+ using the analogWrite() function.
+ This example code is in the public domain.
+ */
+int led = 9;           // the pin that the LED is attached to
+int brightness = 0;    // how bright the LED is
+int fadeAmount = 5;    // how many points to fade the LED by
+// the setup routine runs once when you press reset:
+void setup()  {
+  // declare pin 9 to be an output:
+  pinMode(led, OUTPUT);
+}
+// the loop routine runs over and over again forever:
+void loop()  {
+  // set the brightness of pin 9:
+  analogWrite(led, brightness);
+  // change the brightness for next time through the loop:
+  brightness = brightness + fadeAmount;
+  // reverse the direction of the fading at the ends of the fade:
+  if (brightness == 0 || brightness == 255) {
+    fadeAmount = -fadeAmount ;
+  }
+  // wait for 30 milliseconds to see the dimming effect
+  delay(30);
+}
+</file>