/*

DS-CO2-20二氧化碳溫感測器

pin1 to arduino 5V

pin2 to GND

pin3 to arduino pin10

pin4 to arduino pin11

剩下的pin5~pin7不接

*/

#include <SoftwareSerial.h>

SoftwareSerial Serial1 =  SoftwareSerial(10, 11);

static unsigned int co2 = 0;

static unsigned int ucRxBuffer[10];

void setup() {

  Serial.begin(9600);

  delay(500);

  Serial1.begin(9600);

}

void loop(){

  Serial1.listen();

  byte request[] = {0x42, 0x4d, 0xe3, 0x00, 0x00, 0x01, 0x72};

  Serial1.write(request, 7);

  delay(500);

  while (Serial1.available()){

    for(int i=0; i<12; i=i+1){

      ucRxBuffer[i]=Serial1.read();

      }

    co2 = ucRxBuffer[4]*256+ucRxBuffer[5];

    Serial.println(co2); 

    }

  delay(1000);  

}