void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  //plotCombinedWaves();
  //plotSawtoothWave();
  //plotSquareWave();
  plotTriangleWave();
}

void plotCombinedWaves(){
  for (float i = 0.0; i<= 2* PI; i += 0.1) {
    Serial.print(cos(i)); Serial.print(" "); // cosine wave
    Serial.println(sin(i)); Serial.print(" "); // sine wave
   // Serial.println(i <= PI ? -1.5 : 1.5); // square wave
  }
}

void plotSawtoothWave() {
  for (int i =0; i <= 100; i++){
    Serial.println(i);
  }
}

void plotSquareWave() {
  for (int i =0; i <= 100; i++){
    Serial.println(0);
  }
  for (int i =0; i <= 100; i++){
    Serial.println(100);
  }  
}

void plotTriangleWave() {
  for (int i =0; i <= 100; i++){
    Serial.println(i);
    delay(100);
  }
  for (int i =100; i >= 0; i--){
    Serial.println(i);
    delay(100);
  }  
}