An active 5v alarm buzzer is an audio signalling device that can be electrical, mechanical, electro-mechanical, or piezoelectric compatible with Arduino. An active buzzer generates an audio signal with an internal oscillator. It is high quality and highly durable DC electronic device. Compared to a passive alarm buzzer, it is quite easy to control but a bit expensive. A low-level trigger active buzzer can produce different sounds because of frequency I/O toggling. This buzzer module rings out as long as it is electrified. An active buzzer alarm operates at 3.3v to 5v, as a result, can be directly connected with 3.3v and 5v microcontrollers.
A slightly larger current is needed to make a buzzer beep. However, the output current of Arduino GPIO is too low, so we need a transistor to help. S8550 transistor driver is used for driving the module. S8550 low voltage high current transistor designed for class-B push-pull audio amplifiers. Easy installation of module achieved by fixing into the bolt hole. When the input-output port input shows a low level, the buzzer sounds. An active buzzer widely used in computers, printers, photocopiers, alarms, electronic toys, automotive electronic equipment, telephones, timers, and other electronic products for voice device
- VCC External 3.3V-5V voltage
- GND External GND
- I/O external microcontroller IO port