Tinkercad Circuits：NeoPixel Ring 光控燈

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本文使用TinkerCad Circuits來示範NeoPixel Ring的應用：「光控燈」

材料(Materials)：

1. Arduino UNO R3 x 1
2. NeoPixel Ring x 1
3. Small Breadboard x 1
4. 10K ohm Resistor x 1
5. Photoresistor x 1

電路(Circuit)：

光敏電阻Photoresistor的訊號接在UNO A0，NeoPixel的In接在UNO的D2。

程式碼(The Code)：

	#include <Adafruit_NeoPixel.h>
	#define LDR_PIN A0
	#define PIN 2 // input pin Neopixel is attached to
	#define NUMPIXELS 12 // number of neopixels in Ring
	Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);
	int delayval = 0; // timing delay
	int redColor = 0;
	int greenColor = 0;
	int blueColor = 0;
	int lightLevel = 0;
	int preLightLevel = 0;
	void setup() {
	pixels.begin(); // Initializes the NeoPixel library.
	// Serial.begin(9600);
	}
	void loop() {
	setColor();
	for(int i=0;i<NUMPIXELS;i++){
	// pixels.Color takes RGB values, from 0,0,0 up to 255,255,255
	pixels.setPixelColor(i, pixels.Color(redColor, greenColor, blueColor)); // Moderately bright green color.
	pixels.show(); // This sends the updated pixel color to the hardware.
	delay(delayval); // Delay for a period of time (in milliseconds).
	}
	}
	// setColor()
	// picks random values to set for RGB
	void setColor(){
	lightLevel = map(analogRead(LDR_PIN), 0, 1023, 255, 10);
	Serial.println(lightLevel);
	if( preLightLevel != lightLevel ) {
	redColor = random(0, 10) + lightLevel;
	greenColor = random(0, 10) + lightLevel;
	blueColor = random(0, 10) + lightLevel;
	}
	preLightLevel = lightLevel;
	}

view raw NeoPixelRingLDR.ino hosted with ❤ by GitHub

示範影片(Demo Video)：

範例連結(Example Link)：
https://www.tinkercad.com/things/cqEGU6pHE5s