1.模块介绍
温室效应、废气排放、冰川融化、岛国淹没，这一切的罪魁祸首就是 CO2 的过度排放。是时
候家中常备一款 CO2 监测装置，来知道我们的环境危机是多么的紧迫。它还可以告诉你室内空气
的质量，及时开窗降低 CO2 浓度。康威科技为您带来这款 CO2 传感器模块。可通过 AT 指令轻松
读取 CO2 及 TVOC 数值，并且本模块还有两种不同的门限模式可供选择。
该模块包含一个 SGP30 气体传感器和一个 SHT20 温湿度传感器，可测量总 VOC 信号
(TVOC) 、 CO2 等效信号 (CO2eq) 、温度及湿度。
二.接线
三.AT指令手册
四.uarst
uint8_t buffer[BUFFER_SIZE];
uint16_t _buffindex = 0;
u8 flag61=0;
uint16_t sum=0;
uint16_t cheng=1;
void USART3_IRQHandler(void)
{if(USART_GetITStatus(USART3, USART_IT_RXNE) != RESET) //接收中断{ uint8_t rx_byte = USART_ReceiveData(USART3); // 读取接收到的数据u8 i=0;// 将接收到的字节添加到缓冲区if (_buffindex < BUFFER_SIZE - 1&&flag61==1) {buffer[_buffindex++] = rx_byte;}// 检查玩接受字节if (rx_byte == 13) {// 重置接收缓冲区索引_buffindex = 0;flag61=0;//开始循环处理数据}if(rx_byte=='='){flag61=1;}USART_ClearFlag(USART3, USART_FLAG_RXNE);}
};void USART3_Init(unsigned int baud)
{ USART_InitTypeDef USART_InitStructure; NVIC_InitTypeDef NVIC_InitStructure; GPIO_InitTypeDef GPIO_InitStructure; //声明一个结构体变量，用来初始化GPIO //使能串口的RCC时钟 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB , ENABLE); //使能UART3所在GPIOB的时钟 RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE); //串口使用的GPIO口配置 // Configure USART3 Tx (PB.10) as alternate function push-pull GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_Init(GPIOB, &GPIO_InitStructure); // Configure USART3 Rx (PB.11) as input floating GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOB, &GPIO_InitStructure); //串口中断配置 //Configure the NVIC Preemption Priority Bits NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); // Enable the USART3 Interrupt NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//抢占优先级3NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2; //子优先级3NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); //配置串口 USART_InitStructure.USART_BaudRate = baud; USART_InitStructure.USART_WordLength = USART_WordLength_8b; USART_InitStructure.USART_StopBits = USART_StopBits_1; USART_InitStructure.USART_Parity = USART_Parity_No; USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; // Configure USART3 USART_Init(USART3, &USART_InitStructure);//配置串口3 // Enable USART3 Receive interrupts 使能串口接收中断 USART_ITConfig(USART3, USART_IT_RXNE, ENABLE); // Enable the USART3 USART_Cmd(USART3, ENABLE);//使能串口3 }5.主函数
//TOVC AT指令void TOVC(){
// AT+TVOC\r\n 查询总挥发性有机化合物浓度Usart_SendString2(USART3,"AT+TVOC\r\n");delay_ms(10);}//解析tovc数据组装u8 i=0;u8 endindex=0;u16 TOVCSUM=0;extern uint8_t buffer[BUFFER_SIZE];void getend(){//判断有效位个数for(i=1;i<=5;i++){if(buffer[i]==13){endindex=i;break;}}//循环数据TOVCSUM=(buffer[0]-'0')*10+buffer[1]-'0'; //清空临时变量TOVCSUM=0;for(i=0;i<endindex;i++){TOVCSUM=TOVCSUM*10+(buffer[i]-'0');}}