使用「科易KEYES Arduino UNO R3 開發板」連接「WS2812 RGB12燈燈環模組」, 在WS2812 RGB12燈燈環模組上顯示燈環的顏色。
此WS2812 RGB12燈燈環模組包含於「洞洞兩教學材料包 Education Kit 002」內。
通用型彩色Sensor shield v5.0感測器擴充板
WS2812 RGB12燈燈環模組
WS2812 RGB12燈燈環模組是數位訊號輸出, 可以接「D0 ~ D13」的 KEYES Arduino UNO R3訊號端上。 本範例連接到「D3」
由於WS2812 RGB12燈燈環模組是函式庫型模組,所以需要先在Arduino上下載函式庫,下載方法如下。
在Arduino上選擇工具,選擇管理程式庫,在管理程式庫搜尋Adafruit NeoPixel選擇Adafruit NeoPixel by Adafruit版本1.2.5並安裝。
在WS2812 RGB12燈燈環模組上顯示依序點亮綠色的燈,每0.5秒依序開啟各個LED燈。pixels.setPixelColor(i, pixels.Color(0, 150, 0));裡面的數值分別代表RGB顏色的數值,數值範圍為0-255,可以依據自己想亮燈的顏色去改變數值。
產生出的 Arduino 程式如下
#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?#define PIN 3 // On Trinket or Gemma, suggest changing this to 1// How many NeoPixels are attached to the Arduino?#define NUMPIXELS 12 // Popular NeoPixel ring size// When setting up the NeoPixel library, we tell it how many pixels,// and which pin to use to send signals. Note that for older NeoPixel// strips you might need to change the third parameter -- see the// strandtest example for more information on possible values.Adafruit_NeoPixel pixels(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);#define DELAYVAL 500 // Time (in milliseconds) to pause between pixelsvoid 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.pixels.begin(); // INITIALIZE NeoPixel strip object (REQUIRED)}void loop() {pixels.clear(); // Set all pixel colors to 'off'// The first NeoPixel in a strand is #0, second is 1, all the way up// to the count of pixels minus one.for(int i=0; i<NUMPIXELS; i++) { // For each pixel...// pixels.Color() takes RGB values, from 0,0,0 up to 255,255,255// Here we're using a moderately bright green color:pixels.setPixelColor(i, pixels.Color(0, 150, 0));pixels.show(); // Send the updated pixel colors to the hardware.delay(DELAYVAL); // Pause before next pass through loop}}