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Active Buzzer

At a glance

Category: Public Safety & Emergency Systems In your kit: ×1 (labelled A-BUZZER) Status: 🚧 Full tutorial coming soon

What it is

An active buzzer has its own internal oscillator — you just send it power (HIGH) and it beeps at a fixed frequency. Send LOW, it stops. Simple on/off control, loud enough for alarms.

Active Buzzer module

How an active buzzer differs from a passive one

You may have seen "passive" buzzers in other kits. The difference: a passive buzzer needs you to send it a square wave at the frequency you want — meaning you can play any tone or short melody, but the code is more involved. An active buzzer (what you have) bakes the oscillator into the module, so beeping it is as easy as turning an LED on. For an alarm system, that simplicity is the right choice.

What you'll build with it

  • Fire alarm (pairs with the Fire Detector)
  • Reverse-parking beeper (pairs with the Distance Sensor — faster beep = closer)
  • Door-open warning

Before this page is filled in

See the DHT11 tutorial for the pattern every sensor page follows once complete.