Active buzzers contain an oscillator. It'll make noise when supply power for it.
Passive buzzers don't contain any oscillator. It'll will not make any noise itself. It'll buzz per the information you send to them. You can use it to play a song.
The characteristics of passive buzzers are:
1 There is no vibration source inside the passive, so if you use a DC signal, you can't make it cry. It must be driven by a square wave of 2K ~ 5K
2 The sound frequency can be controlled and the effect of "Do Ri Mi fa So La Ti" can be made.
3 In some special cases, you can reuse a control port with LED
The characteristics of the active buzzer are:
1 Active buzzer has an internal vibration source, so as soon as the power is turned on, it will call
2 The program control is convenient, a single chip high and low level can let it sound, but passive buzzer can not do.
Module Description:
1 Module is driven by 9012 transistor
2 Operating voltage 3.3 V-5V
3 with fixed bolt holes for easy installation
4 Small plate PCB size: 3.3 cm * 1.3 cm
Module interface description(3-wire system):
1 VCC external 3.3 V-5V voltage(can be directly connected to 5V monolithic machine and 3.3 V monolithic machine)
2 GND external GND
3 I/O external single machine IO port
2
Module description
1 module uses S8550 triode drive
2 working voltage 3.3V-5V
3 Fixed bolt holes for easy installation
4 small board PCB size: 3.2cm * 1.3cm
5 When the I/O port is input low, the buzzer sounds
Two module interface description (3-wire system)
1 VCC connects with external 3V-5V DC (can be directly connected to 5v microcontroller and 3.3v microcontroller)
2 GND connects with external GND or "-"
3 I/O connects with externalIO port of single chip (Low level trigger).
For each buzzer module, we'll send you 3pieces of Dopond line.