ลำโพง buzzer แบบ passive Passive buzzer KY-006

Piezo Buzzer: Piezoelectric buzzer is mainly composed of multivibrator, piezoelectric buzzer, impedance matching and resonance box, shell, etc. Some piezoelectric buzzer boxes are also equipped with light-emitting diodes.

The multivibrator is made of transistors or integrated circuits. When it is turned on (1.5v-15v DC working voltage), the multivibrator starts and outputs a 1.5-2.5khz audio signal, and the impedance matching pushes the sound of the piezoelectric buzzer.

Piezo buzzer is made of lead zirconate titanate and lead magnesium niobate piezoelectric ceramic materials. The ceramic surface is plated with silver electrodes, polarized and aged, and then bonded together with brass or stainless steel sheets.


The KY-006 Passive Piezoelectric Buzzer module can produce a range of sound tones depending on the input signal fequency. 

This module consists of a passive buzzer and 3 male header pins. You can use it generate tones between 1.5 to 2.5kHz by switching it on and off repeatedly at different frequencies either using delays or PWM.

Specification
Operating Voltage  1.5V ~ 15V DC
Tone Generation Range  1.5kHz ~ 2.5kHz
Board Dimensions  18.5mm x 15mm [0.728in x 0.591in]


ตัวอย่างการใช้งาน

ขา S ต่อ pin 12 ของ UNO R3
ขา - ต่อ GND ของ UNO R3
ขากลางปล่อยไว้

const int buzzerPin = 12;
const int songLength = 160;
char notes[] = "eeeeeeegcde fffffeeeeddedg eeeeeeegcde fffffeeeggedc pedcp pedcy yedcv ggede eeeeeeegcde fffffeeeeddedg eeeeeeegcde fffffeeeggedc"; // a space represents a rest

int beats[] = { 1, 1, 2, 1, 1, 2, 1, 1, 1, 1, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 1, 1, 1, 2, 1, 1, 2, 1, 1, 1, 1, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 4, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 2, 1, 1, 1, 1, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 1, 1, 1, 2, 1, 1, 2, 1, 1, 1, 1, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 4, 4, 4, 4, 8 };
int tempo = 300;
void setup() {
pinMode(buzzerPin, OUTPUT);
}
void loop() {
int i, duration;
for (i = 0; i < songLength; i++) // step through the song arrays
{
duration = beats[i] * tempo; // length of note/rest in ms
if (notes[i] == ' ') // is this a rest?
{
delay(duration);
} else // otherwise, play the note
{
tone(buzzerPin, frequency(notes[i]), duration);
delay(duration); // wait for tone to finish
}
delay(tempo / 10);
}
while (true) {}
}
int frequency(char note) {
int i;
const int numNotes = 11; // number of notes we're storing
char names[] = { 'p', 'y', 'v', 'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C' };
int frequencies[] = { 201, 222, 250, 262, 294, 330, 349, 392, 440, 494, 523 };
for (i = 0; i < numNotes; i++) {
if (names[i] == note) { return (frequencies[i]); }
}
return (0);
}