Simple code snippet to blink lights and produce a siren for Makeblock's mBot. Please credit if re-distributing this code

mBot_Siren.ino

// Simple code snippet to blink lights and produce a siren for Makeblock's mBot.
// Author: @jenschr / Jensa
// Please credit if re-distributing this code

#include <MeMCore.h>
MeRGBLed rgb(PORT_7);
int highestPitch = 3500;
int lowestPitch = 640;
int toneRightNow = lowestPitch;
boolean isTheToneMovingUpwards = true;
int sequence = 0;
int tempo = 150;

void setup() {
}

void loop() {
  if( isTheToneMovingUpwards ){
    toneRightNow += tempo;
  } else {
    toneRightNow -= tempo;
  }
  
  if( toneRightNow > highestPitch ){
    isTheToneMovingUpwards = false;
  } else if( toneRightNow < lowestPitch ){
    isTheToneMovingUpwards = true;
    sequence++;
  }

  tone(8, toneRightNow,6);
  delay(8);
  noTone(8);
  delay(2);

  if( (toneRightNow/20) % 10 == 0 ){
    rgb.setColorAt(0,0,0,255);
  } else {
    rgb.setColorAt(0,0,0,0);
  }
  if( ((toneRightNow/15)) % 7 == 0 ){
    rgb.setColorAt(1,0,0,255);
  } else {
    rgb.setColorAt(1,0,0,0);
  }
  rgb.show();

  if( sequence > 8 ){
    sequence = 0;
  } else if( sequence > 4 ){
    tempo = 40;
  } else {
    tempo = 150;
  }
}