用stm32f407单片机设计温度报警器的代码
时间: 2023-10-24 14:07:05 浏览: 65
STM32温度报警传感器代码.docx
好的,以下是一个简单的用STM32F407单片机设计温度报警器的代码示例:
```c
#include "stm32f4xx.h"
#define TEMPERATURE_THRESHOLD 30 // 温度阈值
void GPIO_Configuration(void);
void ADC_Configuration(void);
void TIM_Configuration(void);
int main(void)
{
GPIO_Configuration(); // GPIO口配置
ADC_Configuration(); // ADC配置
TIM_Configuration(); // 定时器配置
while(1)
{
ADC_SoftwareStartConv(ADC1); // 启动ADC转换
while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC)); // 等待ADC转换完成
uint16_t adc_value = ADC_GetConversionValue(ADC1); // 获取ADC转换结果
float temperature = (float)adc_value * 3.3f / 4095.0f / 0.01f; // 计算温度值
if(temperature > TEMPERATURE_THRESHOLD)
{
GPIO_SetBits(GPIOA, GPIO_Pin_8); // 控制报警灯
GPIO_SetBits(GPIOA, GPIO_Pin_9); // 控制蜂鸣器
}
else
{
GPIO_ResetBits(GPIOA, GPIO_Pin_8);
GPIO_ResetBits(GPIOA, GPIO_Pin_9);
}
}
}
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
void ADC_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
ADC_InitTypeDef ADC_InitStructure;
ADC_CommonInitTypeDef ADC_CommonInitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStructure);
ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div4;
ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
ADC_CommonInit(&ADC_CommonInitStructure);
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfConversion = 1;
ADC_Init(ADC1, &ADC_InitStructure);
ADC_Cmd(ADC1, ENABLE);
ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_480Cycles);
}
void TIM_Configuration(void)
{
TIM_TimeBaseInitTypeDef TIM_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
TIM_InitStructure.TIM_Period = 1000 - 1; // 定时器周期为1s
TIM_InitStructure.TIM_Prescaler = 42000 - 1; // 定时器分频为84MHz/42000
TIM_InitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_InitStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_InitStructure);
TIM_Cmd(TIM2, ENABLE);
}
```
这段代码使用了PA0口连接的温度传感器进行温度测量,通过ADC转换获取温度值,并与预设的温度阈值进行比较,控制PA8口的LED灯和PA9口的蜂鸣器进行报警。定时器TIM2的计数周期为1s,可以根据需要进行调整。
希望这个代码示例可以对您有所帮助。如果您有其他问题,可以继续提出。
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