MEMS 气体传感器

简介

这是一款由DFRobot推出的3.3/5V兼容的MEMS气体浓度传感器，支持CO，C2H5OH(Alcohol)，H2，NO2，NH3等多种气体浓度的检测，代码中集成了各种气体的浓度换算公式，方便传感器的测试和使用。支持3.3~5.5V宽电压输入，支持I2C输出方式，兼容Arduino、ESP32、树莓派等主流的主控设备，具有良好的兼容性。

产品功能描述

产品参数

引脚说明

SEN0377 Gravity: MEMS Gas Sensor - MiCS-4514接口定义

标号 名称 功能描述
1 SDA I2C数据线SDA
2 SCL I2C时钟线SCL
3 GND 电源负极
4 VCC 电源正极

Arduino使用教程

将程序下载到UNO，打开串口监视器查看气体浓度、原始数据及其他参数。

软硬件准备

样例1：读取传感器计算后的气体浓度（PPM）数据

将样例程序下载到Arduino UNO，打开串口监视器查看气体浓度（PPM）数据。

接线图

样例代码

 /*!
  * @file  getGasPPM.ino
  * @brief Reading Gas concentration, A concentration of one part per million (PPM).
  * @n When using IIC device, select I2C address, set the dialing switch A0, A1 (Address_0 is [0 0]), (Address_1 is [1 0]), (Address_2 is [0 1]), (Address_3 is [1 1]).
  * @n When using the Breakout version, connect the adcPin and PowerPin
  * @copyright   Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com)
  * @licence     The MIT License (MIT)
  * @author      ZhixinLiu(zhixin.liu@dfrobot.com)
  * @version     V1.1
  * @date        2021-04-19
  * @get         from https://www.dfrobot.com
  * @url         https://github.com/dfrobot/DFRobot_MICS
  */
#include "DFRobot_MICS.h"

#define CALIBRATION_TIME   3                      // Default calibration time is three minutes

// When using I2C communication, use the following program to construct an object by DFRobot_MICS_I2C
/**!
    iic slave Address, The default is ADDRESS_0
       ADDRESS_0               0x75             // i2c device address
       ADDRESS_1               0x76
       ADDRESS_2               0x77
       ADDRESS_3               0x78
*/
#define Mics_I2C_ADDRESS ADDRESS_0
DFRobot_MICS_I2C mics(&Wire, Mics_I2C_ADDRESS);

// When using the Breakout version, use the following program to construct an object from DFRobot_MICS_ADC
/**!
  adcPin is A0~A5
  powerPin is General IO
*/
#define ADC_PIN   A0
#define POWER_PIN 10
//DFRobot_MICS_ADC mics(/*adcPin*/ADC_PIN, /*powerPin*/POWER_PIN);

void setup() 
{
  Serial.begin(115200);
  while(!Serial);
  while(!mics.begin()){
    Serial.println("NO Deivces !");
    delay(1000);
  } Serial.println("Device connected successfully !");

  /**!
    Gets the power mode of the sensor
    The sensor is in sleep mode when power is on,so it needs to wake up the sensor. 
    The data obtained in sleep mode is wrong
   */
  uint8_t mode = mics.getPowerState();
  if(mode == SLEEP_MODE){
    mics.wakeUpMode();
    Serial.println("wake up sensor success!");
  }else{
    Serial.println("The sensor is wake up mode");
  }

  /**!
     Do not touch the sensor probe when preheating the sensor.
     Place the sensor in clean air.
     The default calibration time is 3 minutes.
  */
  while(!mics.warmUpTime(CALIBRATION_TIME)){
    Serial.println("Please wait until the warm-up time is over!");
    delay(1000);
  }
}

void loop() 
{
  /**!
    Gas type:
    MICS-4514 You can get all gas concentration
    MICS-5524 You can get the concentration of CH4, C2H5OH, H2, NH3, CO
    MICS-2714 You can get the concentration of NO2
      Methane          (CH4)    (1000 - 25000)PPM
      Ethanol          (C2H5OH) (10   - 500)PPM
      Hydrogen         (H2)     (1    - 1000)PPM
      Ammonia          (NH3)    (1    - 500)PPM
      Carbon Monoxide  (CO)     (1    - 1000)PPM
      Nitrogen Dioxide (NO2)    (0.1  - 10)PPM
  */
  float gasdata = mics.getGasData(C2H5OH);
  Serial.print(gasdata,1);
  Serial.println(" PPM");
  delay(1000);
  //mics.sleepMode();
}

结果

打开串口监视器，预热约3分钟后，得到酒精气体浓度数据。

注意：

样例2：检测气体泄漏

MEMS芯片MiCS-4514对多种气体有反应，但部分气体浓度反馈值的线性度较差，故其浓度值不具有参考价值，但可以用作该气体泄漏的判定依据。

如果你需要进行相关气体的泄漏检测，可以将样例程序下载到Arduino UNO，打开串口监视器查看所设置气体是否泄漏。

接线图

样例代码

 /*!
  * @file  getGasExist.ino
  * @brief Reading Gas concentration, A concentration of one part per million (PPM).
  * @n When using IIC device, select I2C address, set the dialing switch A0, A1 (Address_0 is [0 0]), (Address_1 is [1 0]), (Address_2 is [0 1]), (Address_3 is [1 1]).
  * @n When using the Breakout version, connect the adcPin and PowerPin
  * @copyright   Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com)
  * @licence     The MIT License (MIT)
  * @author      ZhixinLiu(zhixin.liu@dfrobot.com)
  * @version     V1.1
  * @date        2021-04-19
  * @get         from https://www.dfrobot.com
  * @url         https://github.com/dfrobot/DFRobot_MICS
  */

#include "DFRobot_MICS.h"

#define CALIBRATION_TIME   3                      // Default calibration time is three minutes

// When using I2C communication, use the following program to construct an object by DFRobot_MICS_I2C
/**!
    iic slave Address, The default is ADDRESS_0
       ADDRESS_0               0x75             // i2c device address
       ADDRESS_1               0x76
       ADDRESS_2               0x77
       ADDRESS_3               0x78
*/
#define Mics_I2C_ADDRESS ADDRESS_0
DFRobot_MICS_I2C mics(&Wire, Mics_I2C_ADDRESS);

// When using the Breakout version, use the following program to construct an object from DFRobot_MICS_ADC
/**!
  adcPin is A0~A5
  powerPin is General IO
*/
#define ADC_PIN   A0
#define POWER_PIN 10
//DFRobot_MICS_ADC mics(/*adcPin*/ADC_PIN, /*powerPin*/POWER_PIN);

void setup() 
{
  Serial.begin(115200);
  while(!Serial);
  while(!mics.begin()){
    Serial.println("NO Deivces !");
    delay(1000);
  } Serial.println("Device connected successfully !");

  /**!
    Gets the power mode of the sensor
    The sensor is in sleep mode when power is on,so it needs to wake up the sensor. 
    The data obtained in sleep mode is wrong
   */
  uint8_t mode = mics.getPowerState();
  if(mode == SLEEP_MODE){
    mics.wakeUpMode();
    Serial.println("wake up sensor success!");
  }else{
    Serial.println("The sensor is wake up mode");
  }

  /**!
     Do not touch the sensor probe when preheating the sensor.
     Place the sensor in clean air.
     The default calibration time is 3 minutes.
  */
  while(!mics.warmUpTime(CALIBRATION_TIME)){
    Serial.println("Please wait until the warm-up time is over!");
    delay(1000);
  }
}

void loop() 
{
  /**!
    Type of detection gas
    MICS-4514 You can get all gas state
    MICS-5524 You can get the state of CO, CH4, C2H5OH, C3H8, C4H10, H2, H2S, NH3
    MICS-2714 You can get the state of NO2, H2 ,NO
      CO       = 0x01  (Carbon Monoxide)
      CH4      = 0x02  (Methane)
      C2H5OH   = 0x03  (Ethanol)
      C3H8     = 0x04  (Propane)
      C4H10    = 0x05  (Iso Butane)
      H2       = 0x06  (Hydrogen)
      H2S      = 0x07  (Hydrothion)
      NH3      = 0x08  (Ammonia)
      NO       = 0x09  (Nitric Oxide)
      NO2      = 0x0A  (Nitrogen Dioxide)
  */
  int8_t gasFlag = mics.getGasExist(CO);
  if(gasFlag == EXIST){
    Serial.println("The gas exists!");
  }else{
    Serial.println("The gas does not exist!");
  }
  delay(1000);
  //mics.sleepMode();
}

结果

打开串口监视器，预热约3分钟后，可以实时检测一氧化碳（CO）是否泄漏。

注意：

样例3：获取传感器原始模拟量数值

如果您需要获取传感器原始数据，通过数据手册自行计算气体浓度或者需要自行添加温度补偿等功能，您可以将样例程序下载到Arduino UNO，打开串口监视器查看MEMS芯片MiCS-4514的原始电压输出。

接线图

样例代码

 /*!
  * @file  getADCData.ino
  * @brief Reading MICS sensor ADC original value
  * @n When using IIC device, select I2C address, set the dialing switch A0, A1 (Address_0 is [0 0]), (Address_1 is [1 0]), (Address_2 is [0 1]), (Address_3 is [1 1]).
  * @n When using the Breakout version, connect the adcPin and PowerPin
  * @copyright   Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com)
  * @licence     The MIT License (MIT)
  * @author      ZhixinLiu(zhixin.liu@dfrobot.com)
  * @version     V1.1
  * @date        2021-04-19
  * @get         from https://www.dfrobot.com
  * @url         https://github.com/dfrobot/DFRobot_MICS
  */

#include "DFRobot_MICS.h"

// When using I2C communication, use the following program to construct an object by DFRobot_MICS_I2C
/**!
    iic slave Address, The default is ADDRESS_3
       ADDRESS_0               0x75             // i2c device address
       ADDRESS_1               0x76
       ADDRESS_2               0x77
       ADDRESS_3               0x78
*/
#define Mics_I2C_ADDRESS ADDRESS_3
DFRobot_MICS_I2C mics(&Wire, Mics_I2C_ADDRESS);

// When using the Breakout version, use the following program to construct an object from DFRobot_MICS_ADC
/**!
  adcPin is A0~A5
  powerPin is General IO
*/
#define ADC_PIN   A0
#define POWER_PIN 10
//DFRobot_MICS_ADC mics(/*adcPin*/ADC_PIN, /*powerPin*/POWER_PIN);

void setup() 
{
  Serial.begin(115200);
  while(!Serial);
  while(!mics.begin()){
    Serial.println("NO Deivces !");
    delay(1000);
  } Serial.println("Device connected successfully !");

  /**!
    Gets the power mode of the sensor
    The sensor is in sleep mode when power is on,so it needs to wake up the sensor. 
    The data obtained in sleep mode is wrong
   */
  uint8_t mode = mics.getPowerState();
  if(mode == SLEEP_MODE){
    mics.wakeUpMode();
    Serial.println("wake up sensor success!");
  }else{
    Serial.println("The sensor is wake up mode");
  }
}

void loop() 
{
  int16_t ox_data  = 0;
  int16_t red_data = 0;
  /**!
    MICS-5524 Only OX_MODE ADC data can be obtained
    MICS-2714 Only RED_MODE ADC data can be obtained
    MICS-4514 Gravity can obtain AllMode ADC data
  */
  ox_data  = mics.getADCData(OX_MODE);
  //red_data = mics.getADCData(RED_MODE);
  Serial.print("ox  data = ");
  Serial.println(ox_data);
  //Serial.print("red data = ");
  //Serial.println(red_data);
  delay(1000);
}

结果

打开串口监视器，预热约3分钟后，可以获取MEMS芯片MiCS-4514原始数据。

注意：

注意事项

使用注意

传感器数据曲线

MiCS-4514中集成了两个检测单元，分为ox和red，用以计算不同气体的浓度数据。

image-20210524174547715

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