Mô-đun Còi Báo Động / Mật Mã / Hoạt Động Cho Arduino tại Lotte Market

Giới thiệu Mô-đun Còi Báo Động / Mật Mã / Hoạt Động Cho Arduino tại Lotte Market

Module description:
1. Module is driven by 9012 transistor
2. Working voltage is 3.3V-5V
3. With fixing bolt holes for easy installation
4. Small board PCB size: 3.2cm * 1.3cm

Two module interface description (3-wire system)
1. VCC external connection 3.3V-5V voltage (it can be directly connected t o 5V single chip and 3.3V single chip)
2. GND external GND
3. I/0 external single chip IO port

Knowledge literacy:
Nowadays, many people are not very clear about the concept of active buzzer and passive buzzer. Here is a brief introduction.
I hope it will be helpful to everyone in the future.

Note that the ”source” here does not refer to the power source. It refers to the source of the shock.

The features of passive buzzer are:
1 There is no oscillator inside the passive, so if a DC signal is used, it cannot be made to scream.
Must use 2K~5K square wave to drive it
2 The frequency of the sound is controllable, and it can produce the effect of ”multiple mifa Solaxi”.
3 In some special cases, a control port can be reused with LED

The characteristics of the active buzzer are:
1 The active buzzer has an internal oscillation source, so it will beep as long as it is powered on
2 The program control is convenient. The single-chip microcomputer can make a sound with a high and low level, but the passive buzzer can't.