Buzzer Alarm

Purpose This coure will show you the way to use Microduino buzzer to play music. Equipment Microduino-CoreUSB Microduino-BUZZER Microduino-Sensorhub Other Hardware Equipment USB cable One Buzzer Description Buzzer includes active buzzer and passive buzzer. Active buzzer has polarity like LED diode, whose long pin connects to VCC and the short pin to GND. With that connection, active buzzer can make continous sound. While the passive buzzer has no polarity. With three pins consisting of two power pins and an audio input pin, the passive buzzer can only make sound in audio output circuit. In this experiment, we adopt passive buzzer. Program Program code int song[] ={ 262,262,294,262,349,330, 262,262,294,262,392,349, 262,262,523,440,349,330,294, 494,494,440,349,392,349 }; int noteDurations[] = { 4,4,2,2,2,1, 4,4,2,2,2,1, 4,4,2,2,2,2,2, 4,4,2,2,2,1 }; void setup() { for (int thisNote = 0; thisNote<25;thisNote++) { int noteDuration = 1000/noteDurations[thisNote]; tone(8, song[thisNote],noteDuration); int pauseBetweenNotes = noteDuration *1.30; delay(pauseBetweenNotes); noTone(8); } } void loop() { setup(); } Function description The music coming from Arduino board is controlled by tone(). The change of the function can change the rythem of the music. The code includes two forms—tone(pin, frequency, duration) and tone(pin, frequency). ● In the first function, “pin” represents the pin that connects a loudspeaker. ● If using the sencond function, then you alos need noTone() to ccontrol the music. Debugging Step 1: Insert Microduino buzzer to D8 pin of Microduino-Sensorhub. 文件:MicroduinoBuzzerSensor.png 600px Step 2: Connect your PC with USB cable, download the code and program it to Microduino-CoreUSB. 文件:MicroduinoBuzzerSensor1.png 600px Step 3: Power on and you’ll hear the music. 文件:MicroduinoBuzzerSensor2.png 600px Result You can use buzzer to play music.