int tono = 1000; 

void setup (){
     pinMode (8, OUTPUT);
}

void loop (){ 
     digitalWrite (8, HIGH);
     delayMicroseconds (tono/2);
     digitalWrite (8, LOW);
     delayMicroseconds (tono/2);
     tono=analogRead(0);
     tono=map(tono,0,1023,1000,5000);
}




