Active Buzzer Unit
Description:
Driven by C8550 PHP transistor, this active buzzer unit is well designed and made. It starts to buzz as soon as I/O interface outputs low electric level. An LED is installed to indicate signal after power is on. Easy to use and install.
Features:
* Power supply: DC 5V
* Mounting screw: M3
* PCB measurement: 24.8 * 19.3 * 1.6mm
* VCC-> external power GND -> GND OUT -> I/O
Testing Code:
#include
#define uchar unsigned char
#define uint unsigned int
void main()
{
P0=0x00;
P1=0x00;
P2=0x00;
P3=0x00;
while(1) ;
}
