NeoPixel Workshop Instructions
This is the instruction page for the NeoPixel Workshop ran by Andy Miller on 11/11/17
Software to install
You will need to install the following programs and drivers
Download and install the Arduino IDE V 1.8.5 (or newer).
Do not download/install the web IDE!
https://www.arduino.cc/en/Main/Software
There are some step by step instructions here: https://www.arduino.cc/en/Guide/HomePage
Download and install the CH340 USB drivers for the Arduino clones:
https://sparks.gogo.co.nz/ch340.html
Note: The CH340 chip is a USB to serial chip used frequently on Arduino clones. Official Arduinos use the FTDI chip. Those drivers are included in the Arduino software install.
Download the FastLED library from:
https://github.com/FastLED/FastLED/releases Current version is 3.1.6
We will show you how to install this library. The FastLED library is used to control NeoPixels! The official page for the FASTLED library is:
https://github.com/FastLED/FastLED/tree/v3.1.6
Code
Color Pallet
#include <FastLED.h> #define LED_PIN 6 #define NUM_LEDS 60 #define BRIGHTNESS 96 #define LED_TYPE WS2811 #define COLOR_ORDER GRB CRGB leds[NUM_LEDS]; #define UPDATES_PER_SECOND 100 // FastLED provides a few pre-configured color palettes, and makes it // extremely easy to make up your own color schemes with palettes. // // Some notes on the more abstract 'theory and practice' of // FastLED compact palettes are at the bottom of this file. CRGBPalette16 currentPalette; TBlendType currentBlending; extern CRGBPalette16 myRedWhiteBluePalette; extern const TProgmemPalette16 myRedWhiteBluePalette_p PROGMEM; void setup() { delay( 3000 ); // power-up safety delay FastLED.addLeds<LED_TYPE, LED_PIN, COLOR_ORDER>(leds, NUM_LEDS).setCorrection( TypicalLEDStrip ); FastLED.setBrightness( BRIGHTNESS ); currentPalette = RainbowColors_p; currentBlending = LINEARBLEND; } void loop() { ChangePalettePeriodically(); static uint8_t startIndex = 0; startIndex = startIndex + 1; /* motion speed */ FillLEDsFromPaletteColors( startIndex); FastLED.show(); FastLED.delay(1000 / UPDATES_PER_SECOND); } void FillLEDsFromPaletteColors( uint8_t colorIndex) { uint8_t brightness = 255; for( int i = 0; i < NUM_LEDS; i++) { leds[i] = ColorFromPalette( currentPalette, colorIndex, brightness, currentBlending); colorIndex += 3; } } void ChangePalettePeriodically() { uint8_t secondHand = (millis() / 1000) % 60; static uint8_t lastSecond = 99; if( lastSecond != secondHand) { lastSecond = secondHand; if( secondHand == 0) { currentPalette = RainbowColors_p; currentBlending = LINEARBLEND; } if( secondHand == 10) { currentPalette = RainbowStripeColors_p; currentBlending = NOBLEND; } if( secondHand == 15) { currentPalette = RainbowStripeColors_p; currentBlending = LINEARBLEND; } if( secondHand == 20) { SetupPurpleAndGreenPalette(); currentBlending = LINEARBLEND; } if( secondHand == 25) { SetupTotallyRandomPalette(); currentBlending = LINEARBLEND; } if( secondHand == 30) { SetupBlackAndWhiteStripedPalette(); currentBlending = NOBLEND; } if( secondHand == 35) { SetupBlackAndWhiteStripedPalette(); currentBlending = LINEARBLEND; } if( secondHand == 40) { currentPalette = CloudColors_p; currentBlending = LINEARBLEND; } if( secondHand == 45) { currentPalette = PartyColors_p; currentBlending = LINEARBLEND; } if( secondHand == 50) { currentPalette = myRedWhiteBluePalette_p; currentBlending = NOBLEND; } if( secondHand == 55) { currentPalette = myRedWhiteBluePalette_p; currentBlending = LINEARBLEND; } } } // This function fills the palette with totally random colors. void SetupTotallyRandomPalette() { for( int i = 0; i < 16; i++) { currentPalette[i] = CHSV( random8(), 255, random8()); } } // This function sets up a palette of black and white stripes, // using code. Since the palette is effectively an array of // sixteen CRGB colors, the various fill_* functions can be used // to set them up. void SetupBlackAndWhiteStripedPalette() { // 'black out' all 16 palette entries... fill_solid( currentPalette, 16, CRGB::Black); // and set every fourth one to white. currentPalette[0] = CRGB::White; currentPalette[4] = CRGB::White; currentPalette[8] = CRGB::White; currentPalette[12] = CRGB::White; } // This function sets up a palette of purple and green stripes. void SetupPurpleAndGreenPalette() { CRGB purple = CHSV( HUE_PURPLE, 255, 255); CRGB green = CHSV( HUE_GREEN, 255, 255); CRGB black = CRGB::Black; currentPalette = CRGBPalette16( green, green, black, black, purple, purple, black, black, green, green, black, black, purple, purple, black, black ); } // This example shows how to set up a static color palette // which is stored in PROGMEM (flash), which is almost always more // plentiful than RAM. A static PROGMEM palette like this // takes up 64 bytes of flash. const TProgmemPalette16 myRedWhiteBluePalette_p PROGMEM = { CRGB::Red, CRGB::Gray, // 'white' is too bright compared to red and blue CRGB::Blue, CRGB::Black, CRGB::Red, CRGB::Gray, CRGB::Blue, CRGB::Black, CRGB::Red, CRGB::Red, CRGB::Gray, CRGB::Gray, CRGB::Blue, CRGB::Blue, CRGB::Black, CRGB::Black };