CO2 浓度传感器 SEN0220 驱动

传感器采购自 DFRobot，基本上是即买即用。

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Arduino 驱动代码：

/*!
 * @file  SEN0220.ino
 * @brief Infrared CO2 Sensor 0-50000ppm(Wide Range)
 * @n This example is used for detectting CO2 concentration.
 * @copyright  Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com)
 * @license  The MIT License (MIT)
 * @author  lg.gang(lg.gang@qq.com)
 * @version  V1.0
 * @date  2016-06-06
 */

#include <SoftwareSerial.h>

SoftwareSerial mySerial(10, 11); // RX, TX
unsigned char hexData[9] = {0xFF, 0x01, 0x86, 0x00, 0x00, 0x00, 0x00, 0x00, 0x79}; //Read the gas density command /Don't change the order

void setup()
{
    Serial.begin(9600);
    while (!Serial) {
    }
    mySerial.begin(9600);
}

void loop()
{
		mySerial.write(hexData, 9);
		delay(500);

		for (int i = 0, j = 0; i < 9; i++)
		{
				if (mySerial.available() > 0)
				{
						long hi, lo, CO2;
						int ch = mySerial.read();

            if (i == 2) {
                hi = ch;    //High concentration
            }
            if (i == 3) {
                lo = ch;    //Low concentration
            }
            if (i == 8) {
                CO2 = hi * 256 + lo; //CO2 concentration
                Serial.print("CO2 concentration: ");
                Serial.print(CO2);
                Serial.println("ppm");
            }
				}
		}
}