本文提供了基于Arduino开发板快速完成甲醛传感器数据读取的方式，可以用于开发甲醛检测仪。

准备

• 传感器：达特WZ-S甲醛传感器

• 开发板：Arduino Nano

• 开发环境：Arduino

• 依赖库： WZ (https://github.com/leonlucc/WZ)

引脚连接

因为Arduino Nano只有一个硬件UART串口，为了方便调试，我们用硬件串口与电脑连接，并且用软串口的方式来读取传感器数据。

代码

达特WZ-S支持主动上送和被动问答式两种模式：

主动模式读数

#include "WZ.h"

#include <SoftwareSerial.h>

/////////////////////////// Arduino Nano Board

/*

* There is only one serial port on the Arduino Nano, so software serial is needed to connect to the sensor.

*/

const byte PIN_RX = 8; // define software serial RX pin

const byte PIN_TX = 9; // define software serial TX pin

SoftwareSerial WzSoftSerial(PIN_RX, PIN_TX);

WZ wz(WzSoftSerial);

WZ::DATA hcho_data;

void setup()

{

    Serial.begin(9600);

    WzSoftSerial.begin(9600);

    //wz.activeMode();

}

void loop()

{

    if (wz.read(hcho_data))

    {

        Serial.print("HCHO (ppd): ");

        Serial.println(hcho_data.HCHO_PPB);

        Serial.print("HCHO (ug/m3): ");

        Serial.println(hcho_data.HCHO_UGM3); // no data here, 0 returned

        Serial.println();

    }

    // Do other stuff...

}

被动模式读数

#include "WZ.h"

#include <SoftwareSerial.h>

/////////////////////////// Arduino Nano Board

/*

* There is only one serial port on the Arduino Nano, so software serial is needed to connect to the sensor.

*/

const byte PIN_RX = 8; // define software serial RX pin

const byte PIN_TX = 9; // define software serial TX pin

SoftwareSerial WzSoftSerial(PIN_RX, PIN_TX);

WZ wz(WzSoftSerial);

WZ::DATA hcho_data;

void setup()

{

    Serial.begin(9600);

    WzSoftSerial.begin(9600);

    wz.passiveMode();

}

void loop()

{

    wz.requestRead();

    if (wz.readUntil(hcho_data))

    {

        Serial.print("HCHO (ppd): ");

        Serial.println(hcho_data.HCHO_PPB);

        Serial.print("HCHO (ug/m3): ");

        Serial.println(hcho_data.HCHO_UGM3);

        Serial.println();

    }

    delay(1000);

    // Do other stuff...

}