Knight Rider Overkill
This is an extension to the
learning loops example
.
I wired two potentiometers up to the analog
inputs 0 and 1. From these I read the values to determine the delay and the brightness of the
LEDs. In addition, the intensity of the LED's is faded instead of being just on/off as the wave
moves back and forth. This requires using the PWM capable ports (5, 6, 9, 10, 11) for the LED
outputs.
/*
*
Knight Rider Overkill
*
*
By wiring a potentiometer to analog inputs 0 and 1 I can adjust the
*
speed and brightness.
*
*
In ASCII art the extra wiring looks something like this:
*
*
+-+ potentiometer
*
|0|
*
+-+
* /
| \
* 5
v | Gnd
*
|
*
inputPin
*/
int speedPin = 0; // pin to read the potentiometer for speed
int intenPin = 1; // pin to read the potentiometer for brightness
#
define NUMLIGHTS 5
int pins[NUMLIGHTS] = { 5, 6, 9, 10, 11 };
void setup()
{
int lightPin;
for (lightPin=0 ; lightPin < NUMLIGHTS ; lightPin++) {
pinMode(pins[lightPin], OUTPUT);
}
}
void loop()
{
static int pos = 0; // the position of the brightest light in the
light array
static int direction = 1; // the direction the bright spot is travelling (1
or -1)
int light;
int speed = analogRead(speedPin); // how fast the light moves
int inten = analogRead(intenPin) >> 2; // read the value and divide by 4
to get range 0 .. 255
if (inten > 255) inten = 255;
for (light=0 ; light < NUMLIGHTS ; light++) {
if (light == pos) { // The light at this position is set bright
analogWrite(pins[light], inten);
}
else if ( light == (pos+1) || light == (pos-1)) {
//
This makes the two lights adjacent to the bright one glow at reduced
intensity.
//
It makes for a nicer effect
analogWrite(pins[light], inten>>4);
}
else {
