初始化
包含头文件
#include <Adafruit_NeoPixel.h>
针对AVR单片机的特殊设置
#ifdef __AVR__
#include <avr/power.h> // Required for 16 MHz Adafruit Trinket
#endif
// These lines are specifically to support the Adafruit Trinket 5V 16 MHz.
// Any other board, you can remove this part (but no harm leaving it):
#if defined(__AVR_ATtiny85__) && (F_CPU == 16000000)
clock_prescale_set(clock_div_1);
#endif
引脚及灯珠的数量定义
// Which pin on the Arduino is connected to the NeoPixels?
#define PIN 14// On Trinket or Gemma, suggest changing this to 1
#define NUMPIXELS 3 // Popular NeoPixel ring size
定义strip函数
Adafruit_NeoPixel strip(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);
初始化strip函数
strip.begin(); // INITIALIZE NeoPixel strip object (REQUIRED)
输出函数
每次设置完后需要调用此函数进行输出，否则无现象
strip.show();
颜色设置
将颜色的R、G、B设置为0
strip.clear();
RGB设置函数
static uint32_t Adafruit_NeoPixel::Color(uint8_t r, uint8_t g, uint8_t b)
static uint32_t Adafruit_NeoPixel::Color(uint8_t r, uint8_t g, uint8_t b, uint8_t w)
static uint32_t Adafruit_CPlay_NeoPixel::Color(uint8_t r, uint8_t g, uint8_t b)
static uint32_t Adafruit_CPlay_NeoPixel::Color(uint8_t r, uint8_t g, uint8_t b, uint8_t w)
void Adafruit_CPlay_NeoPixel::setPixelColor(uint16_t n, uint8_t r, uint8_t g, uint8_t b)
void Adafruit_CPlay_NeoPixel::setPixelColor(uint16_t n, uint8_t r, uint8_t g, uint8_t b, uint8_t w)
void Adafruit_CPlay_NeoPixel::setPixelColor(uint16_t n, uint32_t c)
void Adafruit_CircuitPlayground::setPixelColor(uint8_t p, uint32_t c)
void Adafruit_CircuitPlayground::setPixelColor(uint8_t p, uint8_t r, uint8_t g, uint8_t b)
void Adafruit_NeoPixel::setPixelColor(uint16_t n, uint8_t r, uint8_t g, uint8_t b)
void Adafruit_NeoPixel::setPixelColor(uint16_t n, uint8_t r, uint8_t g, uint8_t b, uint8_t w)
void Adafruit_NeoPixel::setPixelColor(uint16_t n, uint32_t c)
备注：n是引脚标号，从0开始。w是亮度，0~255
示例一
// NeoPixel Ring simple sketch (c) 2013 Shae Erisson
// Released under the GPLv3 license to match the rest of the
// Adafruit NeoPixel library
#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
#include <avr/power.h> // Required for 16 MHz Adafruit Trinket
#endif
// These lines are specifically to support the Adafruit Trinket 5V 16 MHz.
// Any other board, you can remove this part (but no harm leaving it):
#if defined(__AVR_ATtiny85__) && (F_CPU == 16000000)
clock_prescale_set(clock_div_1);
#endif
// Which pin on the Arduino is connected to the NeoPixels?
#define PIN 14// On Trinket or Gemma, suggest changing this to 1
#define NUMPIXELS 3 // Popular NeoPixel ring size
Adafruit_NeoPixel strip(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);
#define DELAYVAL 500 // Time (in milliseconds) to pause between pixels
uint8_t colorR = 0,colorG = 0,colorB = 255;
uint8_t colorW;
void setup() {
// END of Trinket-specific code.
strip.begin(); // INITIALIZE NeoPixel strip object (REQUIRED)
strip.show(); // Turn OFF all pixels ASAP
}
void loop()
{
for(int i=0; i<strip.numPixels(); i++) {
//For each pixel in strip...
strip.setPixelColor(i, strip.Color(colorR,colorG,colorB)); //Set pixel's color (in RAM)
strip.show(); //Update strip to match
delay(0); //Pause for a moment
}
delay(2000);
strip.clear();
strip.show();
delay(2000);
}
亮度设置
void Adafruit_CPlay_NeoPixel::setBrightness(uint8_t b)
void Adafruit_CircuitPlayground::setBrightness(uint16_t b)
void Adafruit_NeoPixel::setBrightness(uint8_t b)
使用完这个函数之后需要调用show函数，才能输出
示例二
// NeoPixel Ring simple sketch (c) 2013 Shae Erisson
// Released under the GPLv3 license to match the rest of the
// Adafruit NeoPixel library
#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
#include <avr/power.h> // Required for 16 MHz Adafruit Trinket
#endif
// These lines are specifically to support the Adafruit Trinket 5V 16 MHz.
// Any other board, you can remove this part (but no harm leaving it):
#if defined(__AVR_ATtiny85__) && (F_CPU == 16000000)
clock_prescale_set(clock_div_1);
#endif
// Which pin on the Arduino is connected to the NeoPixels?
#define PIN 14// On Trinket or Gemma, suggest changing this to 1
#define NUMPIXELS 3 // Popular NeoPixel ring size
Adafruit_NeoPixel strip(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);
#define DELAYVAL 500 // Time (in milliseconds) to pause between pixels
uint8_t colorR = 0,colorG = 0,colorB = 255;
uint8_t colorW;
void setup() {
// END of Trinket-specific code.
strip.begin(); // INITIALIZE NeoPixel strip object (REQUIRED)
strip.show(); // Turn OFF all pixels ASAP
}
void loop()
{
strip.setBrightness(255);
for(int i=0; i<strip.numPixels(); i++) {
//For each pixel in strip...
strip.setPixelColor(i, strip.Color(colorR,colorG,colorB)); //Set pixel's color (in RAM)
strip.show(); //Update strip to match
delay(0); //Pause for a moment
}
delay(2000);
strip.setBrightness(10);
strip.show();
delay(2000);
}
库函数示例
// 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>
#ifdef __AVR__
#include <avr/power.h> // Required for 16 MHz Adafruit Trinket
#endif
// Which pin on the Arduino is connected to the NeoPixels?
// On a Trinket or Gemma we suggest changing this to 1:
#define LED_PIN 6
// 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)
// setup() function -- runs once at startup --------------------------------
void setup() {
// These lines are specifically to support the Adafruit Trinket 5V 16 MHz.
// Any other board, you can remove this part (but no harm leaving it):
#if defined(__AVR_ATtiny85__) && (F_CPU == 16000000)
clock_prescale_set(clock_div_1);
#endif
// END of Trinket-specific code.
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)
}
// loop() function -- runs repeatedly as long as board is on ---------------
void loop() {
// Fill along the length of the strip in various colors...
colorWipe(strip.Color(255, 0, 0), 50); // Red
colorWipe(strip.Color( 0, 255, 0), 50); // Green
colorWipe(strip.Color( 0, 0, 255), 50); // Blue
// Do a theater marquee effect in various colors...
theaterChase(strip.Color(127, 127, 127), 50); // White, half brightness
theaterChase(strip.Color(127, 0, 0), 50); // Red, half brightness
theaterChase(strip.Color( 0, 0, 127), 50); // Blue, half brightness
rainbow(10); // Flowing rainbow cycle along the whole strip
theaterChaseRainbow(50); // Rainbow-enhanced theaterChase variant
}
// 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 outer loop:
for(long firstPixelHue = 0; firstPixelHue < 5*65536; firstPixelHue += 256) {
for(int i=0; i<strip.numPixels(); i++) {
// For each pixel in strip...
// Offset pixel hue by an amount to make one full revolution of the
// color wheel (range of 65536) along the length of the strip
// (strip.numPixels() steps):
int pixelHue = firstPixelHue + (i * 65536L / strip.numPixels());
// strip.ColorHSV() can take 1 or 3 arguments: a hue (0 to 65535) or
// optionally add saturation and value (brightness) (each 0 to 255).
// Here we're using just the single-argument hue variant. The result
// is passed through strip.gamma32() to provide 'truer' colors
// before assigning to each pixel:
strip.setPixelColor(i, strip.gamma32(strip.ColorHSV(pixelHue)));
}
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
}
}
}