20210114_attiny85_fastled

#include <Arduino.h>
/**************************************************
 *
 *   5/A0 PB5 reset |1  8| Vcc
 *   3/A3 PB3       |2  7| sck  PB2  2/A1
 *   4/A2 PB2       |3  6| miso PB1  1
 *              GND |4  5| mosi PB0  0
 * ATtiny85
 *
 **************************************************/
#include <FastLED.h>

#define LED_PIN     0
#define COLOR_ORDER RGB
#define CHIPSET     WS2811
#define NUM_LEDS    1

CRGB leds[NUM_LEDS];
CRGBPalette16 currentPalette;
TBlendType    currentBlending;

void setup()
{
  delay(500); // sanity delay
  PORTB = 0b00000110; // pull-up on PB2 PB1
  currentPalette = RainbowColors_p;
  FastLED.addLeds<CHIPSET, LED_PIN, COLOR_ORDER>(leds, NUM_LEDS).setCorrection( TypicalLEDStrip );
}

uint8_t i=0;

void loop()
{
  uint16_t pot1, pot2;
  uint8_t  mode;

  pot1 = analogRead(3);
  pot2 = analogRead(2);

  // switch on PB2 PB1
  mode = (PINB & 0b00000110) >> 1;
  switch (mode)
  {
  case 0: // hue and saturation
    leds[0] = CHSV( pot1/4, pot2/4, 255 );
    break;
  case 1: // sweep intensity
    leds[0] = CHSV( pot1/4, 255, cubicwave8(i));
    break;
  case 2: // sweep saturation
    leds[0] = CHSV( pot1/4, cubicwave8(i), 255);
    break;
  case 3:
    switch (pot1/128)
    {
    case 0:
      currentPalette = RainbowColors_p;
      currentBlending = LINEARBLEND;
      break;
    case 1:
      currentPalette = RainbowStripeColors_p;
      currentBlending = LINEARBLEND;
      pot2 = 1024+pot2*8;
      break;
    case 2:
      currentPalette = RainbowStripeColors_p;
      currentBlending = LINEARBLEND;
      break;
    case 3:
      currentPalette = CloudColors_p;
      currentBlending = LINEARBLEND;
      break;
    case 4:
      currentPalette = PartyColors_p;
      currentBlending = LINEARBLEND;
      break;
    case 5:
      currentPalette = OceanColors_p;
      currentBlending = LINEARBLEND;
      break;
    case 6:
      currentPalette = LavaColors_p;
      currentBlending = LINEARBLEND;
      break;
    case 7:
      currentPalette = ForestColors_p;
      currentBlending = LINEARBLEND;
      break;
    default:
      break;
    }

    leds[0] = ColorFromPalette( currentPalette, i, 255, currentBlending);
    break;

  default:
    break;
  }
  i++;

  FastLED.show(); // display this frame
  if (mode != 0)
  {
    FastLED.delay(pot2/8);
  }
  else
  {
    FastLED.delay(50);
  }

}