Buzzer activ KY-012

Specificatii in limba engleza:

The KY-012 Active Buzzer module consists of an active piezoelectric buzzer, it generates a sound of aproximately 2.5kHz when signal is high. 

Operating Voltage        3.5V ~ 5.5V
Maximum Current 30mA / 5VDC
Resonance Frequency     2500Hz ± 300Hz 
Minimum Sound Output    85Db @ 10cm
Working Temperature     -20°C ~ 70°C [-4°F ~ 158°F] 
Storage Temperature     -30°C ~ 105°C [-22°F ~ 221°F]
Dimensions      18.5mm x 15mm [0.728in x 0.591in]

KY-012 Example Code
The following Arduino Sketch will continually turn the buzzer on and off generating a serie of short high-pitched beeps.

int buzzerPin = 8;

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

void loop ()
{
  digitalWrite (buzzerPin, HIGH);
  delay (500);
  digitalWrite (buzzerPin, LOW);
  delay (500);
}