Warning Buzzer & Chime
Nowadays, many people are not very clear about the concepts of active buzzers and passive buzzers. Here is a brief introduction, hoping to be helpful to everyone in the future.
Note that the "" here does not refer to the power supply. Rather, it refers to the of shock.
The characteristics of passive buzzer are:
1 Passive does not have an oscillation inside, so it cannot make it chirp with a DC signal. It must be driven with a square wave of 2K~5K
2. The sound frequency is controllable and can produce the effect of "Multiple Meters and Solace".
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 , so it will sound as soon as it is powered on.
2. The program control is convenient. The single-chip microcomputer can make a sound by changing a high or low level, but the passive buzzer cannot do this.
Each set weighs approximately 6g
1. Module description
1 The module is driven by 9012 triode
2 Working voltage 3.3V-5V
6 Equipped with fixing bolt holes for easy installation
7 Small PCB size: 3.3cm * 1.3cm
2. Module interface description (3-wire system)
1 VCC external 3.3V-5V voltage (can be directly connected to 5v microcontroller and 3.3v microcontroller)
2 GND External GND
3 I/O External microcontroller IO port