火焰警报机器人

int Pin0=8;
int Pin1=9;
int Pin2=10;
int Pin3=11;
int Pwm0=6;
int Pwm1=7;
int s=0;
int PIN_SPEAKER=3;
int length=25;
int flame=A0;
int fan=4;
char notes[]="ggagCbggagDCggGECbaffECDC";
int beats[]={1,1,2,2,2,4,1,1,2,2,2,2,2,1,1,2,2,2,4,1};
int tempo=300;
void playTone(int tone,int duration){
  for(long i=0;i<duration*1000L;i+=tone*2){
    digitalWrite(PIN_SPEAKER,HIGH);
    delayMicroseconds(tone);
    digitalWrite(PIN_SPEAKER,LOW);
    delayMicroseconds(tone);
  }
}

void playNote(char note,int duration){
  char names[]={'c','d','e','f','g','a','b','C','D','E','F','G'};
  int tones[]={1915,1700,1519,1432,1275,1136,1014,956,853,759,716,637,568};
  for(int i=0;i<12;i++){
    if(names[i]==note){
      playTone(tones[i]*2,duration);
    }