// A basic everyday NeoPixel strip test program.
// NEOPIXEL BEST PRACTICES for most reliable operation:
// - Add 1000 uF CAPACITOR between NeoPixel strip's + and - connections.
// - MINIMIZE WIRING LENGTH between microcontroller board and first pixel.
// - NeoPixel strip's DATA-IN should pass through a 300-500 OHM RESISTOR.
// - AVOID connecting NeoPixels on a LIVE CIRCUIT. If you must, ALWAYS
// connect GROUND (-) first, then +, then data.
// - When using a 3.3V microcontroller with a 5V-powered NeoPixel strip,
// a LOGIC-LEVEL CONVERTER on the data line is STRONGLY RECOMMENDED.
// (Skipping these may work OK on your workbench but can fail in the field)
#include <Adafruit_NeoPixel.h>
// Which pin on the Arduino is connected to the NeoPixels?
#define LED_PIN 13
// How many NeoPixels are attached to the Arduino?
#define LED_COUNT 60
// Declare our NeoPixel strip object:
Adafruit_NeoPixel strip(LED_COUNT, LED_PIN, NEO_GRB + NEO_KHZ800);
// Argument 1 = Number of pixels in NeoPixel strip
// Argument 2 = Arduino pin number (most are valid)
// Argument 3 = Pixel type flags, add together as needed:
// NEO_KHZ800 800 KHz bitstream (most NeoPixel products w/WS2812 LEDs)
// NEO_KHZ400 400 KHz (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
// NEO_GRB Pixels are wired for GRB bitstream (most NeoPixel products)
// NEO_RGB Pixels are wired for RGB bitstream (v1 FLORA pixels, not v2)
// NEO_RGBW Pixels are wired for RGBW bitstream (NeoPixel RGBW products)
#define BUTTON_PIN A0
#define POT_PIN A1
// setup() function -- runs once at startup --------------------------------
unsigned int effect_number = 0;
void setup() {
pinMode(BUTTON_PIN, INPUT_PULLUP);
strip.begin(); // INITIALIZE NeoPixel strip object (REQUIRED)
strip.show(); // Turn OFF all pixels ASAP
strip.setBrightness(50); // Set BRIGHTNESS to about 1/5 (max = 255)
// Serial.begin(9600);
}
// loop() function -- runs repeatedly as long as board is on ---------------
void loop() {
if(digitalRead(BUTTON_PIN)==LOW) effect_number++;
// Serial.println(effect_number);
switch(effect_number) {
// Fill along the length of the strip in various colors...
case 1:
colorWipe(strip.Color(255, 255, 255), 50); // White
break;
case 2:
colorWipe(strip.Color(255, 0, 0), 50); // Red
break;
case 3:
colorWipe(strip.Color( 0, 255, 0), 50); // Green
break;
case 4:
colorWipe(strip.Color( 0, 0, 255), 50); // Blue
break;
// Do a theater marquee effect in various colors...
case 5:
theaterChase(strip.Color(127, 127, 127), 50); // White, half brightness
break;
case 6:
theaterChase(strip.Color(127, 0, 0), 50); // Red, half brightness
break;
case 7:
theaterChase(strip.Color( 0, 0, 127), 50); // Blue, half brightness
break;
// Flowing rainbow cycle along the whole strip
case 8:
rainbow(10);
break;
/*
case 9:
// Rainbow-enhanced theaterChase variant
theaterChaseRainbow(50);
break;
*/
default:
effect_number = 0;
colorWipe(strip.Color( 0, 0, 0), 50); // Off
}
}
// Some functions of our own for creating animated effects -----------------
// Fill strip pixels one after another with a color. Strip is NOT cleared
// first; anything there will be covered pixel by pixel. Pass in color
// (as a single 'packed' 32-bit value, which you can get by calling
// strip.Color(red, green, blue) as shown in the loop() function above),
// and a delay time (in milliseconds) between pixels.
void colorWipe(uint32_t color, int wait) {
for(int i=0; i<strip.numPixels(); i++) { // For each pixel in strip...
strip.setPixelColor(i, color); // Set pixel's color (in RAM)
strip.show(); // Update strip to match
delay(wait); // Pause for a moment
}
}
// Theater-marquee-style chasing lights. Pass in a color (32-bit value,
// a la strip.Color(r,g,b) as mentioned above), and a delay time (in ms)
// between frames.
void theaterChase(uint32_t color, int wait) {
for(int a=0; a<10; a++) { // Repeat 10 times...
for(int b=0; b<3; b++) { // 'b' counts from 0 to 2...
strip.clear(); // Set all pixels in RAM to 0 (off)
// 'c' counts up from 'b' to end of strip in steps of 3...
for(int c=b; c<strip.numPixels(); c += 3) {
strip.setPixelColor(c, color); // Set pixel 'c' to value 'color'
}
strip.show(); // Update strip with new contents
delay(wait); // Pause for a moment
}
}
}
// Rainbow cycle along whole strip. Pass delay time (in ms) between frames.
void rainbow(int wait) {
// Hue of first pixel runs 5 complete loops through the color wheel.
// Color wheel has a range of 65536 but it's OK if we roll over, so
// just count from 0 to 5*65536. Adding 256 to firstPixelHue each time
// means we'll make 5*65536/256 = 1280 passes through this loop:
for(long firstPixelHue = 0; firstPixelHue < 5*65536; firstPixelHue += 256) {
// strip.rainbow() can take a single argument (first pixel hue) or
// optionally a few extras: number of rainbow repetitions (default 1),
// saturation and value (brightness) (both 0-255, similar to the
// ColorHSV() function, default 255), and a true/false flag for whether
// to apply gamma correction to provide 'truer' colors (default true).
strip.rainbow(firstPixelHue);
// Above line is equivalent to:
// strip.rainbow(firstPixelHue, 1, 255, 255, true);
strip.show(); // Update strip with new contents
delay(wait); // Pause for a moment
}
}
// Rainbow-enhanced theater marquee. Pass delay time (in ms) between frames.
void theaterChaseRainbow(int wait) {
int firstPixelHue = 0; // First pixel starts at red (hue 0)
for(int a=0; a<30; a++) { // Repeat 30 times...
for(int b=0; b<3; b++) { // 'b' counts from 0 to 2...
strip.clear(); // Set all pixels in RAM to 0 (off)
// 'c' counts up from 'b' to end of strip in increments of 3...
for(int c=b; c<strip.numPixels(); c += 3) {
// hue of pixel 'c' is offset by an amount to make one full
// revolution of the color wheel (range 65536) along the length
// of the strip (strip.numPixels() steps):
int hue = firstPixelHue + c * 65536L / strip.numPixels();
uint32_t color = strip.gamma32(strip.ColorHSV(hue)); // hue -> RGB
strip.setPixelColor(c, color); // Set pixel 'c' to value 'color'
}
strip.show(); // Update strip with new contents
delay(wait); // Pause for a moment
firstPixelHue += 65536 / 90; // One cycle of color wheel over 90 frames
}
}
}
/* Chip ATMega328
Arduino Uno R3 stackable header
_______
Digital: _____/ \__ Analog:
txd ->-|D00 >RXD A5|-
rxd -<-|D01 <TXD A4|-
-|D02 A3 17|-
-|D03~ A2 16|-
-|D04 A1 15|-
-|D05~ A0 14|-<- Button
-|D06~ | Power:
-|D07 Vin|-
| GND|--- Button
-|D08 GND|-
-|D09~ +5V|-
-|D10~ +3.3V|-
-|D11~ Res|-
-|D12 IOREF|-
NeoPixel -<-|D13 LED --- |
Gnd ---|GND |
-|AREF |
-|SCL/PC5 (A5) |
-|SDA/PC4 (A4) |
|________________|
*/
/*
NeoPixel chain
_____1____ _____2____ ____60____
| | | | | |
GND ---| GND GND |---| GND GND |- ... -| GND GND |-
D13->-470R-| >DIN >DO |->-| >DIN >DO |- ... -| >DIN >DO |-
VCC +5V -| +5V +5V |---| +5V +5V |- ... -| +5V +5V |-
C 1000uF |__________| |__________| |__________|
*/