Atmega128a-au Buzzer Driver

1. First look at schematic diagram

The other end of the Beep-m connection is connected to the Mega128a-au PC1

In this way, we give PC1 output low time transistor conduction, buzzer rang, PC1 output high, transistor cutoff, buzzer does not ring.
The current at both ends of the R501 is measured at 20mA at the on-conduction
At 3V voltage, the output current of the I/O pins is typically 10mA
The manual DC characteristics has the following description:
Although each I/O port can sink more than the test conditions (ma at VCC = 5V, ten ma at VCC = 3V)

2. Driver writing
Main support for buzzer opening, closing, and toggle

void pdd_beeper_on (void) {    set_bit (DDRC, PC1);     void Pdd_beeper_off (void) {    set_bit (DDRC, PC1);     void pdd_beeper_toggle (void) {    set_bit (DDRC, PC1);    Flp_bit (PORTC, PC1);}

Atmega128a-au Buzzer Driver