AnalogBasicSetup.ino

//***************************************************************
// Basic example of using analog LEDs with FastLED.
//   Concept originally based on the FastLED AnalogOutput example:
//   https://github.com/FastLED/FastLED/tree/master/examples/AnalogOutput
//
// This has been updated to allow for adjusting "master brightness".
//
// Also pixel data is operated on as if we were using a single
// addressable RGB LED (ie. as if NUM_LEDS = 1), and then the
// R,G,B values are used to update the analog LED display.
//
// The RGB LED I was using to test is a common anode RGB LED so
// I needed to adjust for that as noted below [lines 44-49].
//
//
// Marc Miller, March 2019
//***************************************************************

#include "FastLED.h"
#define REDPIN   9  //pins connected to analog LED R,G,B
#define GREENPIN 10
#define BLUEPIN  11

CRGB leds[1];  //hard coding to 1 for analog case
uint8_t BRIGHTNESS = 255;  //For adjusting master brightness
uint8_t hue;


//---------------------------------------------------------------
void setup() {
  delay(1500);
  pinMode(REDPIN,   OUTPUT);  //setup pins for controlling analog RGB LED
  pinMode(GREENPIN, OUTPUT);
  pinMode(BLUEPIN,  OUTPUT);
  colorBars();  //display R,G,B color check during startup to confirm wiring
}


//---------------------------------------------------------------
//Function to update the analog LED display
void showAnalogRGB( const CRGB& rgb) {
  //Note: scale8 is used to adjust values based on BRIGHTNESS

  //Also note, I needed to update this to use 255 minus the rgb
  //value since the LED I am using is common anode.  If your
  //analog RGB LED is common cathode you don't need the "255-" part.
  analogWrite(REDPIN,   255-scale8(rgb.r, BRIGHTNESS) );  //for common anode
  analogWrite(GREENPIN, 255-scale8(rgb.g, BRIGHTNESS) );
  analogWrite(BLUEPIN,  255-scale8(rgb.b, BRIGHTNESS) );
  //analogWrite(REDPIN,   scale8(rgb.r, BRIGHTNESS) );  //for common cathode
  //analogWrite(GREENPIN, scale8(rgb.g, BRIGHTNESS) );
  //analogWrite(BLUEPIN,  scale8(rgb.b, BRIGHTNESS) );
}


//---------------------------------------------------------------
void loop() {
  EVERY_N_MILLISECONDS(250) {  //cycle through the rainbow
    fill_rainbow( leds, 1, hue);
    hue = hue + 5;
  }

  EVERY_N_MILLISECONDS(5) {  //change the master brightness
    static uint8_t delta = 1;
    BRIGHTNESS = BRIGHTNESS - delta;
  }
  
  showAnalogRGB( leds[0]);  //update the LED display

}//end_main_loop


//---------------------------------------------------------------
void colorBars() {
  //This function is called once during startup to confirm the R,G,B wiring
  fill_solid(leds,1,CRGB::Red);   showAnalogRGB( leds[0] ); delay(1500);
  fill_solid(leds,1,CRGB::Green); showAnalogRGB( leds[0] ); delay(1500);
  fill_solid(leds,1,CRGB::Blue);  showAnalogRGB( leds[0] ); delay(1500);
  fill_solid(leds,1,CRGB::Black); showAnalogRGB( leds[0] ); delay(500);
}