Fermion MEMS 气体传感器 MiCS-2714

简介

这是一款由DFRobot推出的氢气和氮氧化物气体浓度传感器。传感器采用MEMS技术,支持NO, NO2, H2的气体浓度或气体泄漏情况检测,配套的样例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。该产品仅支持5V供电,模拟量电压输出,带有供电使能引脚,便于低功耗使用。

产品功能描述

产品参数

引脚说明

SEN0440 Fermion: MEMS Gas Sensor - MiCS-2714 接口定义

标号 名称 功能描述
1 5V 5V电源正极
2 GND 电源负极
3 A0 传感器原始模拟量输出
4 EN非 传感器供电使能引脚(低电平使能,高电平断电)

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

硬件连接图

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NO2气体浓度(PPM)数据。

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 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(NO2);
  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,得到二氧化氮(NO2)气体浓度数据。

注意:

样例2:检测气体泄漏

MEMS芯片MiCS-2714对NO2, H2和NO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。

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 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(H2);
  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,可以实时检测氢气(H2)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-2714的原始电压输出。

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 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-2714原始数据。

注意:

注意事项

使用注意

传感器数据曲线

MiCS-5524中含有一个CO检测单元,用以检测CO, CH4, C2H5OH, C3H8, C4H10, H2, H2S和NH3的气体浓度数据或气体有无,参考曲线如下图所示。

image-20210526151930409

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