int buzzer = 8 ;// setting controls the digital IO foot buzzer 
void setup ()
{
pinMode (buzzer, OUTPUT) ;// set the digital IO pin mode, OUTPUT out of Wen
}
void loop ()
{
unsigned char i, j ;// define variables
 
while (1)
{
for (i = 0; i <70; i++) // Wen a frequency sound
{
digitalWrite (buzzer, HIGH) ;// send voice
delay (1) ;// Delay 1ms
digitalWrite (buzzer, LOW) ;// do not send voice 
delay (1) ;// delay ms
}
for (i = 0; i <90; i++) // Wen Qie out another frequency sound
{
digitalWrite (buzzer, HIGH) ;// send voice 
delay (2) ;// delay 2ms
digitalWrite (buzzer, LOW) ;// do not send voice 
delay (2) ;// delay 2ms
}
}
}

