PIR to SAMD21 to WS28212b Fade Color 250730

Projects Programming
16

you nested the loops instead of creating two separate loops

this may be easier to understand, i separated out the common code in setLedColor()

/* ************************************
Schematic for this sketch at
Architectural_lights/Strip Lights/WS2812b/SAMD21_to_WS2812b_w_PIR_schematic_250723.jpg

PIR_to_SAMD21_to_WS28212b_250725.ino
combines
PIR sensor code from
PIR_to_Arduino_250725.ino
with PIR digitalRead code from
Staircase_Single_Channel_PIR_to_LED_220424.ino
with WS28212b code from
WS2812b_Fade_Color_to_Color_250722.ino

************************************ */

#include "FastLED.h"
#define DATA_PIN 4
#define NUM_LEDS 299

#define COLOR_ORDER GRB

CRGB leds[NUM_LEDS];

void setup() {
    FastLED.addLeds<WS2811, DATA_PIN, GRB>(leds, NUM_LEDS);
    FastLED.setBrightness(84);
    pinMode(2, INPUT); //Pin 2 as INPUT
}


void fadeall() {
    for(int i = 0; i < NUM_LEDS; i++)
        leds[i].nscale8(250);
}

void loop() {
    if (digitalRead(2) == HIGH)
    runSAMD21();
}


void setLedColor (
    int colorStep )
{
    int r = colorStep;  // Redness starts at zero and goes up to full
    int b = 255-colorStep;  // Blue starts at full and goes down to zero
    int g = 0;              // No green needed to go from blue to red

    // Now loop though each of the LEDs and set each one to the current color
    for(int x = 0; x < NUM_LEDS; x++)
             leds[x] = CRGB(r,g,b);

     FastLED.show();

     delay(10);
}

void runSAMD21(){

    // 256 steps to get from blue to red
    // (the most possible with an LED with 8 bit RGB values)

    for( int colorStep=0; colorStep<256; colorStep++)
        setLedColor (colorStep);

    for( int colorStep=256; colorStep>0; colorStep--)
        setLedColor (colorStep);
}