I’ve created a simple beeping alarm with a Piezo transducer. Connect the Piezo + to pin 9, and the Piezo – to Gnd. Run the following sketch. Next version will be using the tone() command to build a Morse Code trainer.
Become the Maker you were born to be. Try Arduino Academy for FREE!
/* Piezo This example shows how to run a Piezo Buzzer on pin 9 using the analogWrite() function. It beeps 3 times fast at startup, waits a second then beeps continuously at a slower pace */
void setup() {
// declare pin 9 to be an output:
pinMode(9, OUTPUT);
beep(50);
beep(50);
beep(50);
delay(1000);
}
void loop() {
beep(200);
}
void beep(unsigned char delayms){
analogWrite(9, 20); // Almost any value can be used except 0 and 255
// experiment to get the best tone
delay(delayms); // wait for a delayms ms
analogWrite(9, 0); // 0 turns it off
delay(delayms); // wait for a delayms ms
}
Become the Maker you were born to be. Try Arduino Academy for FREE!