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Create LEDtest.ino

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Mike Barela 2019-04-18 14:48:17 -04:00 committed by GitHub
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/*****************************************************************************
Sketch for testing WS2801 LED strands - lights one LED along length of strand.
Because only one LED is lit at a time, can safely be powered from Arduino +5V.
*****************************************************************************/
#include "SPI.h"
int nPixels = 150;
void setup() {
SPI.begin();
SPI.setBitOrder(MSBFIRST);
SPI.setDataMode(SPI_MODE0);
SPI.setClockDivider(SPI_CLOCK_DIV16); // 1 MHz
}
int p = 0; // Current pixel being lit
void loop() {
int i, j;
// Issue data for all LEDs in strand regardless
for (i=0; i < nPixels; i++) {
// Each LED = 3 bytes; white if current pixel, else off
for(j=0; j < 3; j++) {
SPI.transfer((i == p) ? 0xff : 0x00);
}
}
// LEDs automatically latch on pause
delay(25);
// Advance to next pixel, then back to start
if(++p >= nPixels) p = 0;
}