nwmedia-c262-lab3-basic.ino

#define BAUD_RATE 9600
#define SAMPLING_RATE 100

#define LED_RED 9
#define LED_GREEN 10
#define LED_BLUE 11

#define POT_SPEED A3
#define POT_RED A2
#define POT_GREEN A1
#define POT_BLUE A0

const uint8_t PHASE = SAMPLING_RATE / 3;

uint8_t t = 0;
uint8_t dt = 1;

void setup() {
  pinMode(LED_RED, OUTPUT);
  pinMode(LED_GREEN, OUTPUT);
  pinMode(LED_BLUE, OUTPUT);
  Serial.begin(BAUD_RATE);
}

void loop() {
  int r = (1023 - analogRead(POT_RED)) >> 2;
  int g = (1023 - analogRead(POT_GREEN)) >> 2;
  int b = (1023 - analogRead(POT_BLUE)) >> 2;
  int dt = (1023 - analogRead(POT_SPEED)) >> 7;
  if (dt == 0) {
    analogWrite(LED_RED, r);
    analogWrite(LED_GREEN, g);
    analogWrite(LED_BLUE, b);
  } else {
    double rx = 0.5 + 0.5 * sin(2 * PI * t / SAMPLING_RATE);
    double gx = 0.5 + 0.5 * sin(2 * PI * (t + PHASE) / SAMPLING_RATE);
    double bx = 0.5 + 0.5 * sin(2 * PI * (t + 2 * PHASE) / SAMPLING_RATE);
    analogWrite(LED_RED, r * rx);
    analogWrite(LED_GREEN, g * gx);
    analogWrite(LED_BLUE, b * bx);
  }
  t = (t + dt) % SAMPLING_RATE;
  delay(10);
}