Praktikum Arduino UNO dengan LED
/*
Blink
Turns on an LED on for one second, then off for one second, repeatedly.
This example code is in the public domain.
*/
// Pin 13 has an LED connected on most Arduino boards.
// give it a name:
int led = 13;
// the setup routine runs once when you press reset:
void setup() {
// initialize the digital pin as an output.
pinMode(led, OUTPUT);
}
// the loop routine runs over and over again forever:
void loop() {
digitalWrite(led, HIGH); // turn the LED on (HIGH is the voltage level)
delay(1000); // wait for a second
digitalWrite(led, LOW); // turn the LED off by making the voltage LOW
delay(1000); // wait for a second
}
2. Fade
// Fading LED
int value = 0; // variable to keep the actual value
int ledpin = 9; // light connected to digital pin 9
void setup()
{
// nothing for setup
}
void loop()
{
for(value = 0 ; value <= 255; value+=5) // fade in (from min to max)
{
analogWrite(ledpin, value); // sets the value (range from 0 to 255)
delay(30); // waits for 30 milli seconds to see the dimming effect
}
for(value = 255; value >=0; value-=5) // fade out (from max to min)
{
analogWrite(ledpin, value);
delay(30);
}
}
3. Candle Light
/*
* CandleLight
*
* Use random numbers to emulate a flickering candle with a
* PWM'd LED
*
*/
int ledPin = 6; // select the pin for the LED
int val = 0; // variable that holds the current LED brightness
int delayval = 0; // variable that holds the current delay time
void setup()
{
randomSeed(0); // initialize the random number generator
pinMode(ledPin, OUTPUT); // declare the ledPin as an OUTPUT
}
void loop()
{
val = random(100,255); // pick a random number between 100 - 255
analogWrite(ledPin, val); // set the LED brightness
delayval = random(50,150); // pick a random num between 50, 150
delay(delayval); // delay that many milliseconds
}
4. Moodlight
/*
* RGB_LEDs sketch
* RGB LEDs driven from analog output ports
*/
const int redPin = 6; // choose the pin for each of the LEDs
const int greenPin = 5;
const int bluePin = 3;
const boolean invert = false; // set true if common anode, false if
// common cathode
int color = 0; // a value from 0 to 255 representing the hue
int R, G, B; // the Red Green and Blue color components
void setup()
{
// pins driven by analogWrite do not need to be declared as outputs
}
void loop()
{
int brightness = 255; // 255 is maximum brightness
hueToRGB( color, brightness); // function to convert hue to RGB
// write the RGB values to the pins
analogWrite(redPin, R);
analogWrite(greenPin, G);
analogWrite(bluePin, B );
color++; // increment the color
if(color > 255)
color = 0;
delay(10);
}
// function to convert a color to its Red, Green, and Blue components.
void hueToRGB( int hue, int brightness)
{
unsigned int scaledHue = (hue * 6);
unsigned int segment = scaledHue / 256; // segment 0 to 5 around
// the color wheel
unsigned int segmentOffset = scaledHue - (segment * 256); // position
// within the seg
unsigned int complement = 0;
unsigned int prev = (brightness * ( 255 - segmentOffset)) / 256;
unsigned int next = (brightness * segmentOffset) / 256;
if(invert)
{
brightness = 255-brightness;
complement = 255;
prev = 255-prev;
next = 255-next;
}
switch(segment ) {
case 0: // red
R = brightness;
G = next;
B = complement;
break;
case 1: // yellow
R = prev;
G = brightness;
B = complement;
break;
case 2: // green
R = complement;
G = brightness;
B = next;
break;
case 3: // cyan
R = complement;
G = prev;
B = brightness;
break;
case 4: // blue
R = next;
G = complement;
B = brightness;
break;
case 5: // magenta
default:
R = brightness;
G = complement;
B = prev;
break;
}
}
Sumber : Catatan Praktikum
