// the number of the LED pin
//const int ledPin = 13;  // 16 corresponds to GPIO16

// setting PWM properties
const int freq = 5000;
const int ledChannel = 0;
const int ledChannel1 = 1;
const int resolution = 10;

// setting sine parameters
const int ceiling = 1024;
const int bottomlimit = 65;
const int toplimit = 257; // 10 bit resolution=1024
const int timestep = 7; // sine freq period

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  // configure LED PWM functionalitites
  ledcSetup(ledChannel, freq, resolution);
  ledcSetup(ledChannel1, freq, resolution);
  
  // attach the channel to the GPIO to be controlled
  ledcAttachPin(13, ledChannel);
  ledcAttachPin(12, ledChannel1);
}

void loop() {
  // put your main code here, to run repeatedly
  //int timestep = 2;
  for (int degree = 1; degree <= 360; degree++)
  {
    double rads = PI / 180;
    double dutycycle = ((ceiling * sin(1 * degree * rads)) + ceiling) / 2;

    // ceiling/(toplimit-bottomlimit)
    double range = (dutycycle / (ceiling / (toplimit - bottomlimit)) + bottomlimit);
    Serial.println(range);
    ledcWrite(ledChannel, range);
    ledcWrite(ledChannel1, range);
    delay(timestep);
    //delay(3);
  }

}