DESIGN III / IV / PROJECT NOTES

Arduino：光センサーとモーター制御

    #include 

        // CdS
        const int lightSensorPin = A1;

        // MORTOR
        const int DIR  = 8;
        const int STEP = 9;

        // NeoPixel
        const int NEOPIXEL_PIN = 6;
        const int NUMPIXELS = 5; 

        Adafruit_NeoPixel pixels(NUMPIXELS, NEOPIXEL_PIN, NEO_GRB + NEO_KHZ800);

        // LV
        const int threshold = 500;

        // RD
        unsigned long lastSwitchTime = 0; 
        bool direction = true; 

        // DV
        bool isDark = false;  

        // LC
        int colorPos = 0;

        void setup() {
          Serial.begin(9600);

          // MORTOR SETUP
          pinMode(DIR, OUTPUT);
          pinMode(STEP, OUTPUT);
          digitalWrite(DIR, LOW);
          digitalWrite(STEP, LOW);

          // NeoPixel SETUP
          pixels.begin();
          pixels.clear();
          pixels.show();
        }

        void loop() {
          int lightValue = analogRead(lightSensorPin);
          Serial.println(lightValue);

          if (lightValue > threshold) {
            // DARK
            moveMotor(100);         
            rainbowCycle();         

            if (!isDark) {
              Serial.println("PLAY"); 
              isDark = true;
            }
          } else {
            // Clear
            digitalWrite(STEP, LOW);   
            pixels.clear();           
            pixels.show();

            if (isDark) {
              Serial.println("PAUSE"); 
              isDark = false;
            }
          }

          delay(10);
        }

        // MC
        void moveMotor(int delaytime) {
          unsigned long currentTime = millis();

          if (currentTime - lastSwitchTime >= 500) { // CT
            direction = !direction;                   // CD
            lastSwitchTime = currentTime;
          }

          if (direction) {
            digitalWrite(DIR, HIGH); 
          } else {
            digitalWrite(DIR, LOW); 
          }

          digitalWrite(STEP, HIGH);
          delayMicroseconds(delaytime);
          digitalWrite(STEP, LOW);
          delayMicroseconds(delaytime);
        }

        //  NeoPixel RC
        void rainbowCycle() {
          colorPos++;
          if (colorPos > 255) colorPos = 0;

          uint32_t color = Wheel(colorPos);
          for (int i = 0; i < NUMPIXELS; i++) {
            pixels.setPixelColor(i, color);
          }
          pixels.show();
          delay(5); // CS
        }

        // RC
        uint32_t Wheel(byte WheelPos) {
          WheelPos = 255 - WheelPos;
          if (WheelPos < 85) {
            return pixels.Color(255 - WheelPos * 3, 0, WheelPos * 3);
          }
          if (WheelPos < 170) {
            WheelPos -= 85;
            return pixels.Color(0, WheelPos * 3, 255 - WheelPos * 3);
          }
          WheelPos -= 170;
          return pixels.Color(WheelPos * 3, 255 - WheelPos * 3, 0);
        }