二氧化碳传感器模块

#define UART1_TX_PIN    5
#define UART1_RX_PIN    6
#define DATA_BUFF_LEN   9

byte query_co2[9]={0xff, 0x01, 0x86, 0x00, 0x00, 0x00, 0x00, 0x00, 0x79};   // Query Data
              //  {0xff, 0x01, 0x87, 0x00, 0x00, 0x00, 0x00, 0x00, 0x78};   // Zero Calibration     Calibration can only be performed after stabilizing for 5 minutes in a 400 ppm environment.
              //  {0xff, 0x01, 0x87, 0x00, 0x00, 0x00, 0x00, 0x00, 0x78};   // Span Calibration     Select 2000 ppm environment (span calibration needs to be performed first)
int concentration_co2 = 0;

void setup() 
{
  Serial.begin(115200);
  Serial1.begin(9600, SERIAL_8N1, UART1_RX_PIN, UART1_TX_PIN); // UART1
}

void loop() 
{
  byte receivedData[DATA_BUFF_LEN] = {0};
  Serial1.write(query_co2, DATA_BUFF_LEN);
  delay(10);

  if (Serial1.available())
  {
    // Read the number of available bytes
    int  numBytes = Serial1.available();
    // Read bytes one by one and store them into a byte array
    Serial1.read(receivedData, numBytes);
    concentration_co2 = receivedData[2]*256 + receivedData[3];
  }

  Serial.print(concentration_co2);
  Serial.println(" ppm");
  delay(1000);
}