speak 
                    
                    
                    #define NOTE_C5  100
#define NOTE_C3  350
int o=0;
int led=9;
int speaker=8;
int y=0;
int q=1;
void setup(){
Serial.begin(9600);
pinMode(led,OUTPUT);
pinMode(speaker,OUTPUT);
}
void loop(){
int readvalue = analogRead(A0);
float x = readvalue * (255.0/1023.0);
int z=x;
if(z==0){
  digitalWrite(led,LOW);
  noTone(8);
  y=0;
}
else if(z>0 && z<255){
y=NOTE_C5+z;
analogWrite(led,z); 
tone(8, y,4);
}
else{
  digitalWrite(led,HIGH);
  speakerr();
 delay(500);
  digitalWrite(led,LOW);
 delay(500);
 y=0;
}
}
void speakerr(){
  for(int k=0;k<800;k++){
  tone(8,NOTE_C3,4);
  }
}
 
                        
                        
                    
 
        

