基于stm32F103的防盗装置

以下是基于STM32F103的简单防盗装置示例代码：

#include "stm32f10x.h"

#define SENSOR_PIN GPIO_Pin_0
#define SENSOR_PORT GPIOA
#define LED_PIN GPIO_Pin_1
#define LED_PORT GPIOA
#define BUZZER_PIN GPIO_Pin_2
#define BUZZER_PORT GPIOA

void GPIO_Configuration(void);
void EXTI_Configuration(void);
void Buzzer_Configuration(void);

int main(void) {
  GPIO_Configuration();
  EXTI_Configuration();
  Buzzer_Configuration();

  while (1) {
    // 等待中断触发
  }
}

void GPIO_Configuration(void) {
  GPIO_InitTypeDef GPIO_InitStructure;

  // 使能GPIOA时钟
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

  // 配置SENSOR_PIN为输入模式
  GPIO_InitStructure.GPIO_Pin = SENSOR_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
  GPIO_Init(SENSOR_PORT, &GPIO_InitStructure);

  // 配置LED_PIN和BUZZER_PIN为输出模式
  GPIO_InitStructure.GPIO_Pin = LED_PIN | BUZZER_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(LED_PORT, &GPIO_InitStructure);
}

void EXTI_Configuration(void) {
  EXTI_InitTypeDef EXTI_InitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;

  // 使能AFIO时钟
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);

  // 配置SENSOR_PIN为中断输入模式
  GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0);

  // 配置EXTI线路
  EXTI_InitStructure.EXTI_Line = EXTI_Line0;
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure);

  // 配置中断优先级
  NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}

void Buzzer_Configuration(void) {
  TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
  TIM_OCInitTypeDef TIM_OCInitStructure;

  // 使能TIM2时钟
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

  // 配置TIM2的时间基准
  TIM_TimeBaseStructure.TIM_Period = 999;
  TIM_TimeBaseStructure.TIM_Prescaler = 7199;
  TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

  // 配置TIM2的PWM输出模式
  TIM_OCStructInit(&TIM_OCInitStructure);
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = 499;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
  TIM_OC1Init(TIM2, &TIM_OCInitStructure);

  // 启动TIM2
  TIM_Cmd(TIM2, ENABLE);
}

void EXTI0_IRQHandler(void) {
  if (EXTI_GetITStatus(EXTI_Line0) != RESET) {
    // SR505检测到有人体靠近
    GPIO_WriteBit(LED_PORT, LED_PIN, Bit_SET);
    TIM_SetCompare1(TIM2, 799); // 使蜂鸣器发出声音
    delay(500); // 延迟500毫秒
    TIM_SetCompare1(TIM2, 0); // 关闭蜂鸣器
    EXTI_ClearITPendingBit(EXTI_Line0);
  }
}

void delay(uint32_t nCount) {
  uint32_t i;

  for (i = 0; i < nCount; i++);
}

该示例代码使用SR505检测有人体靠近，当检测到有人靠近时，LED会亮起来，同时蜂鸣器会发出声音，以起到防盗的作用。需要注意的是，蜂鸣器的控制采用的是PWM输出，可以通过调整占空比来控制声音大小。