Description:
Passive buzzer module liquidificador de voiture analog ultrasonic sensor acs712 load cell cx 31 vw Hc-sr501
Now there are many people to the concept of passive buzzer and active buzzer is not very clear, make a simple introduction here, hope to help everyone to use in the future.
Note that in this case, the “source” is not the power supply. It is the volatile source.
The characteristics of passive buzzer is:
1: internal passive without shock source, so if you use a dc signal, you can not do it. Must use 2k ~ 5k square wave to drive it
For more than 2 sound frequency control, can make “m hair sola west” effect.
3 in a special case, can reuse and LED a control
The characteristics of active buzzer is:
1 active buzzer inside with shock source, as long as the electricity will call
2. convenient program control, single chip microcomputer a high and low level can make the sound, and the passive buzzer is can not do.
1 module driven by 9012 triode
2 working voltage of 3.3V to 5V
6 sets of fixed bolt hole, convenient installation
7 small board PCB size: 3.3cm * 1.3cm
2 module interface specification (3-wire system)
1 external voltage VCC 3.3V to 5V (which can be directly connected to 5V microcontroller and 3.3V microcontroller)
2 external GND GND
3 external microcontroller IO port I / O
1pcs Passive Buzzer Module
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