changing_animation_speed.ino

//***************************************************************
// Example for Kyle Bostick for this post:
// https://plus.google.com/107012178390358476390/posts/7fUz4nN9tPb
//
// Marc Miller, Nov 2018
//***************************************************************

#include "FastLED.h"
#define LED_TYPE LPD8806
#define DATA_PIN 11
#define CLOCK_PIN 13
#define NUM_LEDS 32
#define COLOR_ORDER GRB
#define BRIGHTNESS 255
CRGB leds[NUM_LEDS];

String setEffect = "Red Green White Loop";  //set current effect
int animationspeed = 50;  //starting speed


//---------------------------------------------------------------
void setup() {
  Serial.begin(115200);  // Allows serial monitor output (check your baud rate)
  delay(2000);  // Startup delay
  FastLED.addLeds<LED_TYPE,DATA_PIN,CLOCK_PIN,COLOR_ORDER>(leds, NUM_LEDS);  // ***For strips using Clock.
  //FastLED.addLeds<LED_TYPE,DATA_PIN>(leds, NUM_LEDS);  // ***For Clock-less strips.
  FastLED.setBrightness(BRIGHTNESS);
}


//---------------------------------------------------------------
void loop() {
  
  if (setEffect == "Red Green White Loop") {

    //Print out animationspeed to check the value.
    Serial.print("Animation speed: "); Serial.println(animationspeed);

    //Adjust speed of function based on the value of animationspeed
    uint8_t delayValue = map ( animationspeed, 0, 150, 5, 255 );

    for(int i = 0; i < NUM_LEDS; i++) {
      leds[i] = CRGB(255, 0, 0);
      FastLED.show();
      delay(delayValue);
    }

    for(int i = (NUM_LEDS)-1; i >= 0; i--) {
      leds[i] = CRGB(0, 255, 0);
      FastLED.show();
      delay(delayValue);
    }
    
    for(int i = 0; i < NUM_LEDS; i++) {
      leds[i] = CRGB(255, 255, 255);
      FastLED.show();
      delay(delayValue);
    }

    for(int i = (NUM_LEDS)-1; i >= 0; i--) {
      leds[i] = CRGB(0, 255, 0);
      FastLED.show();
      delay(delayValue);
    }

  }//end "Red Green White Loop"


  //FOR TESTING -- simulated a change of animationspeed
  //Doesn't actually run every three seconds due to the use of
  //blocking delay() in the function above, but still works fine
  //for simulating a change.
  EVERY_N_SECONDS(3) {
    animationspeed = random8(0, 150);  //pick new random animation speed
    Serial.println("  **New animationspeed picked**");
  }


}//end_main_loop