New to this but i found a sketch I want to use with a 12v input to run it.. I know i have to use a resistor in the wiring. I just can't figure out how to mod this sketch.. What i want is my uno to stay on.. And when pin 9 recieves the votlage input, it runs the code until the power to pin 9 is disconnected.
#include <Adafruit_NeoPixel.h>
// SETUP YOUR OUTPUT PIN AND NUMBER OF PIXELS
#define PIN 7
#define NUM_PIXELS 34
Adafruit_NeoPixel strip = Adafruit_NeoPixel(NUM_PIXELS, PIN, NEO_GRB + NEO_KHZ800);
void setup() {
strip.begin();
clearStrip(); // Initialize all pixels to 'off'
delay(1000);
}
void loop() {
knightRider(2, 15, 10, 0xFF0000); // Cycles, Speed, Width, RGB Color (red)
knightRider(3, 1, 1, 0xFF0000); // Cycles, Speed, Width, RGB Color (red)
clearStrip();
delay(1);
}
// Cycles - one cycle is scanning through all pixels left then right (or right then left)
// Speed - how fast one cycle is (32 with 16 pixels is default KnightRider speed)
// Width - how wide the trail effect is on the fading out LEDs. The original display used
// light bulbs, so they have a persistance when turning off. This creates a trail.
// Effective range is 2 - 8, 4 is default for 16 pixels. Play with this.
// Color - 32-bit packed RGB color value. All pixels will be this color.
// knightRider(cycles, speed, width, color);
void knightRider(uint16_t cycles, uint16_t speed, uint8_t width, uint32_t color) {
uint32_t old_val[NUM_PIXELS]; // up to 256 lights!
// Larson time baby!
for(int i = 0; i < cycles; i++){
for (int count = 1; count<NUM_PIXELS; count++) {
strip.setPixelColor(count, color);
old_val[count] = color;
for(int x = count; x>0; x--) {
old_val[x-1] = dimColor(old_val[x-1], width);
strip.setPixelColor(x-1, old_val[x-1]);
}
strip.show();
delay(speed);
}
for (int count = NUM_PIXELS-1; count>=0; count--) {
strip.setPixelColor(count, color);
old_val[count] = color;
for(int x = count; x<=NUM_PIXELS ;x++) {
old_val[x-1] = dimColor(old_val[x-1], width);
strip.setPixelColor(x+1, old_val[x+1]);
}
strip.show();
delay(speed);
}
}
}
void clearStrip() {
for( int i = 0; i<NUM_PIXELS; i++){
strip.setPixelColor(i, 0x000000); strip.show();
}
}
uint32_t dimColor(uint32_t color, uint8_t width) {
return (((color&0xFF0000)/width)&0xFF0000) + (((color&0x00FF00)/width)&0x00FF00) + (((color&0x0000FF)/width)&0x0000FF);
}
// Using a counter and for() loop, input a value 0 to 251 to get a color value.
// The colors transition like: red - org - ylw - grn - cyn - blue - vio - mag - back to red.
// Entering 255 will give you white, if you need it.
uint32_t colorWheel(byte WheelPos) {
byte state = WheelPos / 21;
switch(state) {
case 0: return strip.Color(255, 0, 255 - ((((WheelPos % 21) + 1) * 6) + 127)); break;
case 1: return strip.Color(255, ((WheelPos % 21) + 1) * 6, 0); break;
case 2: return strip.Color(255, (((WheelPos % 21) + 1) * 6) + 127, 0); break;
case 3: return strip.Color(255 - (((WheelPos % 21) + 1) * 6), 255, 0); break;
case 4: return strip.Color(255 - (((WheelPos % 21) + 1) * 6) + 127, 255, 0); break;
case 5: return strip.Color(0, 255, ((WheelPos % 21) + 1) * 6); break;
case 6: return strip.Color(0, 255, (((WheelPos % 21) + 1) * 6) + 127); break;
case 7: return strip.Color(0, 255 - (((WheelPos % 21) + 1) * 6), 255); break;
case 8: return strip.Color(0, 255 - ((((WheelPos % 21) + 1) * 6) + 127), 255); break;
case 9: return strip.Color(((WheelPos % 21) + 1) * 6, 0, 255); break;
case 10: return strip.Color((((WheelPos % 21) + 1) * 6) + 127, 0, 255); break;
case 11: return strip.Color(255, 0, 255 - (((WheelPos % 21) + 1) * 6)); break;
default: return strip.Color(0, 0, 0); break;
}
}
