Обзор инфракрасного датчика CO2 MH-Z19

CO2

#include <SoftwareSerial.h>;

SoftwareSerial mySerial(2, 3); // RX, TX

byte request[9] = {0xFF,0x01,0x86,0x00,0x00,0x00,0x00,0x00,0x79};

unsigned char response[9];

void setup() {

Serial.begin(9600);

mySerial.begin(9600);

}

void loop()

{

mySerial.write(request, 9);

memset(response, 0, 9);

mySerial.readBytes(response, 9);

int i;

byte crc = 0;

for (i = 1; i < 8; i++) crc+=response[i];

crc = 255 - crc;

crc++;

if ( !(response[0] == 0xFF && response[1] == 0x86 && response[8] == crc) ) {

Serial.println("CRC error");

} else {

unsigned int HLconcentration = (unsigned int) response[2];

unsigned int LLconcentration = (unsigned int) response[3];

unsigned int co2 = (256*HLconcentration) + LLconcentration;

Serial.println(co2);

for (i = 0; i < 9; i++) {

Serial.print("0x");

Serial.print(response[i],HEX);

Serial.print(" ");

}

Serial.println(" ");

}

delay(5000);

}

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