传感器介绍

PMS5003是一款基于激光散射原理的数字式通用颗粒物浓度传感器,可连续采集
并计算单位体积内空气中不同粒径的悬浮颗粒物个数,即颗粒物浓度分布,进而
换算成为质量浓度,并以通用数字接口形式输出。本传感器可入各种与空气中
悬浮颗粒物浓度相关的仪器仪表或环境改善设备,为其提供及时准确的浓度数
据。

数据处理

读取的数据：

解析pm2.5的代码

逻辑是：
1、初始化串口和定时器10ms中断
2、循环读取一帧数据到rev_pm25_bufferdata
3、在主函数解析数据rev_pm25_bufferdata
4、最终的pm2.5数值就是pm25_value

使用pm25_value 的数据即可。

#include "sys.h"
#include "delay.h"
#include "usart.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>#include "led.h"
#include "timer.h"char rev_pm25_bufferdata[50];
char rev_pm25_data_cnt = 0;
char rev_pm25_flag = 0;
char rev_pm25_timercnt = 0;
char rev_pm25_sucess = 0;
uint32_t pm25_value = 0;
uint32_t pm25_verify = 0;
unsigned char pm25_verify_cnt = 0;int main(void) {NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);delay_init();RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable, ENABLE);delay_ms(500);uart_init(9600);TIM4_Int_Init(99, 7199);                                     /* 10Khz的计数频率，计数到50为10ms */TIM_Cmd(TIM4, ENABLE);                                        /* 使能TIMx  开始计时 */while (1) {delay_ms(5);if (rev_pm25_sucess == 1) {rev_pm25_sucess = 0;if ((rev_pm25_bufferdata[0] == 0x42) && (rev_pm25_bufferdata[1] == 0x4d)) {pm25_verify = 0;for (pm25_verify_cnt = 0; pm25_verify_cnt < 30; pm25_verify_cnt++) {pm25_verify += rev_pm25_bufferdata[pm25_verify_cnt];}if (pm25_verify == (rev_pm25_bufferdata[30] * 256 + rev_pm25_bufferdata[31])) {pm25_value = rev_pm25_bufferdata[6] * 256 + rev_pm25_bufferdata[7];}}}}
}// 10ms
void TIM4_IRQHandler(void)                                    /* TIM4中断 */
{if (TIM_GetITStatus(TIM4, TIM_IT_Update) != RESET)  /* 检查TIM4更新中断发生与否 */{TIM_ClearITPendingBit(TIM4, TIM_IT_Update);   /* 清除TIM4更新中断标志 *///10ms一帧if (rev_pm25_flag == 1) {rev_pm25_timercnt++;}if (rev_pm25_timercnt >= 4) {rev_pm25_timercnt = 0;rev_pm25_flag = 0;//数据处理标志rev_pm25_sucess = 1;}}
}//A9模块
void USART1_IRQHandler(void)                                                                  /* 串口1中断服务程序 */
{u8 receiveData;if (USART_GetITStatus(USART1, USART_IT_RXNE) !=RESET)                              /* 接收中断(接收到的数据必须是0x0d 0x0a结尾) */{receiveData = USART_ReceiveData(USART1);                                      /* 读取接收到的数据 */if (rev_pm25_flag == 0) {rev_pm25_data_cnt = 0;rev_pm25_bufferdata[rev_pm25_data_cnt++] = receiveData;rev_pm25_flag = 1;} else if (rev_pm25_flag == 1) {rev_pm25_bufferdata[rev_pm25_data_cnt++] = receiveData;if (rev_pm25_data_cnt >= 50) {rev_pm25_data_cnt = 0;}}}
}

帮助、问询

https://docs.qq.com/sheet/DUEdqZ2lmbmR6UVdU?tab=BB08J2