Hello everyone,
I've finally gotten the following code (mostly) working with my sparkfun pro micro, a 5m (160 pixel) led strip and a 5-position switch (yes, for a hula-hoop). Now I am wanting to add more cases (ie patterns) to the handlestrip() function. However, for the life of me, I cannot figure out how a few things work:
1) Does "tick" just continue to count up to 4,294,967,295 (because it is an unsigned long) and then stop? What is the point of this?
2) In handlestrip(case 3) below, does every pixel in the strip turn on when "tick" is a multiple of 100, and then off when "tick"/50 has a remainder of 1 (e.g. at 51; 101; 151; 201...)? Is there a better way to adjust the rate of "strobing?"
3) How would I implement the ledbeltkit functions found later in the code (colorwipe, colorchase, dither, larson scanner, etc.) into additional cases in handlestrip() while retaining the ability to cycle through colors?
4) Would it be possible to read the last color that was displayed on the strip/pixel and then display the opposite color? Or, would it be possible to do a strobe in predefined colors while still retaining the ability to cycle through colors? For example, when using one of the strobe functions, instead of turning one color on and off, I want it to strobe between two colors - one that comes from GetColor() and another that is predefined depending on what GetColor() returns. (So, anytime GetColor() returns red, the second strobe color will be yellow. Anytime GetColor() returns blue, the second strobe will be white.. etc.)
Thank you all in advance 
//All credit for this code goes to Philihp at philihp.com/.../
#include "LPD8806.h"
#include "SPI.h"
#include <avr/sleep.h>
#include "carrot.h"
//since data is on 11 and clock is on 13, we can use hardware SPI
LPD8806 strip = LPD8806(160);
int powerPin = 4;
int upModePin = 3;
int upColorPin = 2;
int upModeButtonState = HIGH;
int upModeButtonCycles = 0;
int upColorButtonState = HIGH;
int upColorButtonCycles = 0;
int CYCLES_DEBOUNCE = 2; //check the button for X ticks to see if it is bouncing
int MAX_COLORS = 8;
int MAX_MODES = 8;
int MAX_STRIPES = 5;
unsigned long tick = 0;
int mode = 1;
int color = 1;
uint16_t i, j, x, y;
uint32_t c, d;
// Set the first variable to the NUMBER of pixels. 32 = 32 pixels in a row
// The LED strips are 32 LEDs per meter but you can extend/cut the strip
void ISR_Wake() {
detachInterrupt(0);
detachInterrupt(1);
}
void blackout() {
for(int i=0; i < strip.numPixels()+1; i++) {
strip.setPixelColor(i, strip.Color(0,0,0));
}
strip.show();
}
void triggerSleep() {
blackout();
attachInterrupt(0,ISR_Wake,LOW); //pin 2
attachInterrupt(1,ISR_Wake,LOW); //pin 3
set_sleep_mode(SLEEP_MODE_PWR_DOWN);
sleep_enable();
sleep_mode();
//sleeping, until rudely interrupted
sleep_disable();
}
void triggerModeUp() {
++mode;
blackout();
}
void triggerColorUp() {
color++;
blackout();
}
void handleButtons() {
if(digitalRead(powerPin) == LOW) {
triggerSleep();
}
// software debounce
if(digitalRead(upModePin) != upModeButtonState) {
upModeButtonCycles++;
if(upModeButtonCycles > CYCLES_DEBOUNCE) {
upModeButtonCycles = 0;
upModeButtonState = digitalRead(upModePin);
if(upModeButtonState == LOW) {
triggerModeUp();
}
}
}
// software debounce
if(digitalRead(upColorPin) != upColorButtonState) {
upColorButtonCycles++;
if(upColorButtonCycles > CYCLES_DEBOUNCE) {
upColorButtonCycles = 0;
upColorButtonState = digitalRead(upColorPin);
if(upColorButtonState == LOW) {
triggerColorUp();
}
}
}
}
void handleStrip() {
switch(mode%MAX_MODES) {
case 0: //solid
c = GetColor(color%MAX_COLORS);
for(i=0; i<strip.numPixels(); i++) {
strip.setPixelColor(i, c);
}
break;
case 1: //solid
c = GetColor((tick%3+color)% MAX_COLORS);
for(i=0; i<strip.numPixels(); i++) {
strip.setPixelColor(i, c);
}
break;
case 2: //Strobe
if(tick % 100 == 0) {
c = GetColor(color%MAX_COLORS);
for(i=0; i<strip.numPixels(); i++) {
strip.setPixelColor(i, c);
}
}
if(tick % 50 == 1) {
c = strip.Color(0,0,0);
for(i=0; i<strip.numPixels(); i++) {
strip.setPixelColor(i, c);
}
}
break;
case 3: //Strobe modified
j = tick % 384;
if(tick % 100 == 0) {
c = GetColor(color%MAX_COLORS);
for(i=0; i<strip.numPixels(); i++) {
strip.setPixelColor(i, c);
}
}
if(tick % 50 == 1) {
c = GetColor(color%MAX_COLORS);
for(i=0; i<strip.numPixels(); i++) {
strip.setPixelColor(i, Wheel(j));
}
}
break;
case 4: //chasers
d = (color / MAX_COLORS) % MAX_STRIPES + 1; //chaser
c = GetColor(color % MAX_COLORS); //color
j = tick % (strip.numPixels()/d);
for(i=0; i < strip.numPixels(); i++) {
if(i % (strip.numPixels()/d) == j) {
strip.setPixelColor(i, c);
}
else {
strip.setPixelColor(i, strip.Color(0,0,0));
}
}
break;
case 5: //chasers + statics
d = (color / MAX_COLORS) % MAX_STRIPES + 1; //chaser
c = GetColor(color % MAX_COLORS); //color
j = tick % (strip.numPixels()/d);
for(i=0; i < strip.numPixels(); i++) {
x = i % (strip.numPixels()/d);
if((x == j) || (x == 0)) {
strip.setPixelColor(i, c);
}
else {
strip.setPixelColor(i, strip.Color(0,0,0));
}
}
break;
case 6: // rainbows
j = tick % 384;
for(i=0; i < strip.numPixels(); i++) {
strip.setPixelColor(i, Wheel(((i * 384 / strip.numPixels() * (color%MAX_COLORS)) + j) % 384));
}
break;
case 7: //carrot POV
j = tick % 158;
d = carrot[j];
//green //orange
c = (j < 30)?GetColor((color+2)%MAX_COLORS):GetColor((color+3)%MAX_COLORS);
for(i=0;i<32;i++) {
//adding 32 to the index makes it appear on the side opposite the controller
if(d & 0x00000001) {
strip.setPixelColor(i+32, c);
}
else {
strip.setPixelColor(i+32, strip.Color(0,0,0));
}
d >>= 1;
}
break;
/* case 7: //test
int hiBit = 0;
int n = strip.numPixels() - 1;
for(i=0; i<strip.numPixels(); i++) {
for(int bit=1; bit < 0x8000; bit <<= 1) {
if(n & bit) hiBit = bit;
}
int bit, reverse;
for(int i=0; i<(hiBit << 1); i++) {
// Reverse the bits in i to create ordered dither:
reverse = 0;
for(bit=1; bit <= hiBit; bit <<= 1) {
reverse <<= 1;
if(i & bit) reverse |= 1;
}
strip.setPixelColor(reverse, c);
strip.show();
delay(500);
}
delay(250); // Hold image for 1/4 sec
}
break; */
}
strip.setPixelColor(strip.numPixels()-1, strip.Color(0,0,0)); //set that last LED off because it overlaps
strip.show();
}
void setup() {
// Start up the LED strip
strip.begin();
pinMode(powerPin, INPUT); // declare pushbutton as input
pinMode(upModePin, INPUT); // declare pushbutton as input
pinMode(upColorPin, INPUT); // declare pushbutton as input
triggerSleep();
}
void loop() {
tick++;
handleStrip();
handleButtons();
}
// fill the dots one after the other with said color
// good for testing purposes
void colorWipe(uint32_t c, uint8_t wait) {
int i;
for (i=0; i < strip.numPixels(); i++) {
strip.setPixelColor(i, c);
strip.show();
delay(wait);
}
}
// Chase a dot down the strip
// good for testing purposes
void colorChase(uint32_t c, uint8_t wait) {
int i;
for (i=0; i < strip.numPixels(); i++) {
strip.setPixelColor(i, 0); // turn all pixels off
}
for (i=0; i < strip.numPixels(); i++) {
strip.setPixelColor(i, c); // set one pixel
strip.show(); // refresh strip display
delay(wait); // hold image for a moment
strip.setPixelColor(i, 0); // erase pixel (but don't refresh yet)
}
strip.show(); // for last erased pixel
}
// An "ordered dither" fills every pixel in a sequence that looks
// sparkly and almost random, but actually follows a specific order.
void dither(uint32_t c, uint8_t wait) {
// Determine highest bit needed to represent pixel index
int hiBit = 0;
int n = strip.numPixels() - 1;
for(int bit=1; bit < 0x8000; bit <<= 1) {
if(n & bit) hiBit = bit;
}
int bit, reverse;
for(int i=0; i<(hiBit << 1); i++) {
// Reverse the bits in i to create ordered dither:
reverse = 0;
for(bit=1; bit <= hiBit; bit <<= 1) {
reverse <<= 1;
if(i & bit) reverse |= 1;
}
strip.setPixelColor(reverse, c);
strip.show();
delay(wait);
}
delay(250); // Hold image for 1/4 sec
}
// "Larson scanner" = Cylon/KITT bouncing light effect
void scanner(uint8_t r, uint8_t g, uint8_t b, uint8_t wait) {
int i, j, pos, dir;
pos = 0;
dir = 1;
for(i=0; i<((strip.numPixels()-1) * 8); i++) {
// Draw 5 pixels centered on pos. setPixelColor() will clip
// any pixels off the ends of the strip, no worries there.
// we'll make the colors dimmer at the edges for a nice pulse
// look
strip.setPixelColor(pos - 2, strip.Color(r/4, g/4, b/4));
strip.setPixelColor(pos - 1, strip.Color(r/2, g/2, b/2));
strip.setPixelColor(pos, strip.Color(r, g, b));
strip.setPixelColor(pos + 1, strip.Color(r/2, g/2, b/2));
strip.setPixelColor(pos + 2, strip.Color(r/4, g/4, b/4));
strip.show();
delay(wait);
// If we wanted to be sneaky we could erase just the tail end
// pixel, but it's much easier just to erase the whole thing
// and draw a new one next time.
for(j=-2; j<= 2; j++)
strip.setPixelColor(pos+j, strip.Color(0,0,0));
// Bounce off ends of strip
pos += dir;
if(pos < 0) {
pos = 1;
dir = -dir;
} else if(pos >= strip.numPixels()) {
pos = strip.numPixels() - 2;
dir = -dir;
}
}
}
// Sine wave effect
#define PI 3.14159265
void wave(uint32_t c, int cycles, uint8_t wait) {
float y;
byte r, g, b, r2, g2, b2;
// Need to decompose color into its r, g, b elements
g = (c >> 16) & 0x7f;
r = (c >> 8) & 0x7f;
b = c & 0x7f;
for(int x=0; x<(strip.numPixels()*5); x++)
{
for(int i=0; i<strip.numPixels(); i++) {
y = sin(PI * (float)cycles * (float)(x + i) / (float)strip.numPixels());
if(y >= 0.0) {
// Peaks of sine wave are white
y = 1.0 - y; // Translate Y to 0.0 (top) to 1.0 (center)
r2 = 127 - (byte)((float)(127 - r) * y);
g2 = 127 - (byte)((float)(127 - g) * y);
b2 = 127 - (byte)((float)(127 - b) * y);
} else {
// Troughs of sine wave are black
y += 1.0; // Translate Y to 0.0 (bottom) to 1.0 (center)
r2 = (byte)((float)r * y);
g2 = (byte)((float)g * y);
b2 = (byte)((float)b * y);
}
strip.setPixelColor(i, r2, g2, b2);
}
strip.show();
delay(wait);
}
}
/* Helper functions */
//Input a value 0 to 384 to get a color value.
//The colours are a transition r - g - b - back to r
uint32_t Wheel(uint16_t WheelPos)
{
byte r, g, b;
switch(WheelPos / 128)
{
case 0:
r = 127 - WheelPos % 128; // red down
g = WheelPos % 128; // green up
b = 0; // blue off
break;
case 1:
g = 127 - WheelPos % 128; // green down
b = WheelPos % 128; // blue up
r = 0; // red off
break;
case 2:
b = 127 - WheelPos % 128; // blue down
r = WheelPos % 128; // red up
g = 0; // green off
break;
}
return(strip.Color(r,g,b));
}
uint32_t GetColor(int c)
{
switch(c) {
case 0:
return strip.Color(127,0,0);
case 1:
return strip.Color(0,0,127);
case 2:
return strip.Color(0,127,0);
case 3:
return strip.Color(127,31,0);
case 4:
return strip.Color(127,127,0);
case 5:
return strip.Color(0,127,127);
case 6:
return strip.Color(127,0,127);
case 7:
return strip.Color(127,127,127);
default:
return strip.Color(0,0,0);
}
}
