If else语句，用于Pi中的蜂鸣器系统

# 导入相关库
import RPi.GPIO as GPIO
import time

# 设置蜂鸣器引脚
buzzer_pin = 18

# 初始化GPIO
GPIO.setmode(GPIO.BCM)
GPIO.setup(buzzer_pin, GPIO.OUT)

# 定义发声函数
def buzz(pitch, duration):
    period = 1.0 / pitch
    delay = period / 2
    cycles = int(duration * pitch)
    for i in range(cycles):
        GPIO.output(buzzer_pin, GPIO.HIGH)
        time.sleep(delay)
        GPIO.output(buzzer_pin, GPIO.LOW)
        time.sleep(delay)

# 根据条件判断控制蜂鸣器
condition = True  # 可以根据实际情况设置条件
if condition:
    buzz(440, 0.5)  # 发出440Hz的声音，持续0.5秒
else:
    buzz(880, 0.5)  # 发出880Hz的声音，持续0.5秒

# 清理GPIO资源
GPIO.cleanup()