ledripple_no_ir.ino

ledripple_no_ir.ino

#include <avr/pgmspace.h>

#define DATA_1 (PORTC |=  0X01)
#define DATA_0 (PORTC &=  0XFE)
#define STRIP_PINOUT (DDRC=0xFF)
#define NOP __asm__("nop\n\t");
#define NOP28 NOP NOP NOP NOP NOP NOP NOP NOP NOP NOP NOP NOP NOP NOP NOP NOP NOP NOP NOP NOP NOP NOP NOP NOP NOP NOP NOP
#define NOP9 NOP NOP NOP NOP NOP NOP NOP NOP NOP
#define NOP3 NOP NOP NOP

unsigned long pattern[10];
unsigned long color1 = 0xff0000, color2 = 0x0000ff;
int timer = 0, index = 0;

void setup()
{
  STRIP_PINOUT;
  reset_strip();
  Serial.begin(9600);
  Serial.println("Hello, LED strip!");
}

void loop() {
  int i;
  for (i = 0; i < 10; i++) {
    pattern[i] = (i == index)? color1 : color2;
  }
  send_pattern(pattern);
  delay(100);
  index++;
  if (index >= 10) {
    index = 0;
  }
}

void reset_strip()
{
  DATA_0;
  delayMicroseconds(20);
}

void send_pattern(unsigned long * data) {
  int i;
  unsigned long j;
  noInterrupts();
  for (i = 0; i < 10; i++)
  {
    for (j = 0x800000; j > 0x00000000; j >>= 1)
    {
      if (data[i] & j)
      {
        DATA_1;
        NOP28
        DATA_0;
      }
      else
      {
        DATA_1;
        NOP9
        DATA_0;
        NOP3
      }
    }
  }
  interrupts();
}

Obviously, only use 12V if your LED strip datasheet tells you to...