Grove Multichannel Gas Sensor 多通道有害氣體感測器|瓦斯氣體傳感器

商品說明

Grove Multichannel Gas Sensor 多通道有害氣體感測器，本環境檢測感測器內建 MiCS-6814單晶片, 可以偵測多種對人體有害的氣體，傳感器可以同時針對三種氣體進行數據監控。感測器是屬於 Grove 介面，你可以將其插入到 Grove 擴充板，並與Arduino的直接，不需要任何跳線工作。它的接口是I2C，所以將其插入到相應的Grove擴充板的I2C端口，那麼你就可以開始工作了。

四個引腳被指出並以下是該圖

電源是3.3V和5V之間，所以這種傳感器可以是具有微控制器，其輸出電壓為3.3V兼容。

特點

• 在一個封裝三個完全獨立的感測元件
• 建有ATmega168PA
• 與可編程地址I2C接口
• 加熱功率可以被關閉的低功耗
• 可檢測氣體
  • 一氧化碳CO 1 – 1000PPM
  • 二氧化氮NO2 0.05 – 10ppm的
  • 乙醇C2H6OH 10 – 500ppm的
  • 氫氣H2 1 – 1000PPM
  • 氨NH3 1 – 為500ppm
  • 甲烷CH4> 1000PPM
  • 丙烷C3H8> 1000PPM
  • 異丁烷C4H10> 1000PPM

電氣特性

性能RED傳感器

性能OX傳感器

性能氨氣傳感器

What is it?

Grove – Multichannel Gas sensor is a environment detecting sensor with a built in MiCS-6814 which can detect many unhealthful gases, and three gases can be measured simultaneously due to its multi channels, so it can help you to monitor the concentration which more than one gas.

This sensor is belong to Grove system, and you can plug it onto the Base shield and work with Arduino directly without any jumper wires. The interface of it is I2C, so plug it onto the I2C port of Base shield, then you can start to work it.

Hardware Overview

The power supply is between 3.3v and 5v, so this sensor can be compatible with a micro-controller whose output voltage is 3.3v.

Feature

• Three fully independent sensing elements on one package
• Built with ATmega168PA
• I2C interface with programmable address
• Heating power can be shut down for low power
• Detectable gases
  • Carbon monoxide CO 1 – 1000ppm
  • Nitrogen dioxide NO2 0.05 – 10ppm
  • Ethanol C2H6OH 10 – 500ppm
  • Hydrogen H2 1 – 1000ppm
  • Ammonia NH3 1 – 500ppm
  • Methane CH4 >1000ppm
  • Propane C3H8 >1000ppm
  • Iso-butane C4H10 >1000ppm

Block Diagram

Electrical Characteristics

Performance RED sensor

Performance OX sensor

Performance NH3 sensor

Firmware and library

Firmware

This grove module has an ATMega168 MCU which is flashed with a factory firmware. The firmware does the following works:

1. controls the power on and off for heating circuit and indicator LED
2. listens on the command that make the module do the calibration – the calibration will sample the resistance of the MEMS core of this sensor which will be used as the reference, so please perform calibration in a fresh air condition
3. listens on commands that get resistance value of one of the three sensor core which will be used to calculate the concentration of a specific gas
4. listens on the command that changing the I2C address of this module – at most time, you don’t need to do this except that the I2C address of this module (0x04) conflicts with another slave module.

Note: the calibration has been done before the modules leave the factory. If you want to recalibrate, please do make sure that the air condition is fresh.

Library

The library reads resistance values from the module and calculate the concentration of gas. One thing must be noticed is, the readings of this sensor are not supposed to be used to distinguish the type of gases, but to measure the concentration of a specific gas which is known to be that kind of gas.

The cores of this sensor are more sensitive to CO, NO2 and NH3, the precision of measurement for other gases would be worse.

Note: doCalibrate() function will take 8 seconds before it returns, as said above, at most time you don’t need to recalibrate the sensor.

Demonstration

Hardware Installation:

• 1) Connect Grove – Multichannel Gas Sensor to Seeeduino.

Upload Code:

• 2) Download Arduino Library & Grove/Xadow firmware and install it to Arduino Library.
• 3) Open the code directly by the path:File -> Example ->Mutichannel_Gas_Sensor->ReadSensorValue_Grove.

The content of ReadSensorValue_Grove.ino please refer to below.

/*
    This is a demo to test MutichannelGasSensor library
    This code is running on Xadow-mainboard, and the I2C slave is Xadow-MutichannelGasSensor
    There is a ATmega168PA on Xadow-MutichannelGasSensor, it get sensors output and feed back to master.
    the data is raw ADC value, algorithm should be realized on master.
    
    please feel free to write email to me if there is any question 
    
    Jacky Zhang, Embedded Software Engineer
    qi.zhang@seeed.cc
    17,mar,2015
*/


#include <Wire.h>
#include "MutichannelGasSensor.h"

void setup()
{
    Serial.begin(9600);  // start serial for output
    Serial.println("power on!");

    mutichannelGasSensor.begin(0x04);//the default I2C address of the slave is 0x04
    //mutichannelGasSensor.changeI2cAddr(0x10);
    //mutichannelGasSensor.doCalibrate();
    //delay(8000);
    while(mutichannelGasSensor.readR0() < 0)
    {
        Serial.println("sensors init error!!");
        delay(1000);
    }
    Serial.print("Res0[0]: ");
    Serial.println(mutichannelGasSensor.res0[0]);
    Serial.print("Res0[1]: ");
    Serial.println(mutichannelGasSensor.res0[1]);
    Serial.print("Res0[2]: ");
    Serial.println(mutichannelGasSensor.res0[2]);
    mutichannelGasSensor.powerOn();
}

void loop()
{
    mutichannelGasSensor.readR();
    Serial.print("Res[0]: ");
    Serial.println(mutichannelGasSensor.res[0]);
    Serial.print("Res[1]: ");
    Serial.println(mutichannelGasSensor.res[1]);
    Serial.print("Res[2]: ");
    Serial.println(mutichannelGasSensor.res[2]);
    
    mutichannelGasSensor.calcGas();
    Serial.print("NH3: ");
    Serial.print(mutichannelGasSensor.density_nh3);
    Serial.println("ppm");
    Serial.print("CO: ");
    Serial.print(mutichannelGasSensor.density_co);
    Serial.println("ppm");
    Serial.print("NO2: ");
    Serial.print(mutichannelGasSensor.density_no2);
    Serial.println("ppm");
    
    delay(1000);
    Serial.println("...");
}

• 4) Upload the code. Remeber to select Seeeduino Uno from the Tools | Board menu of the

Arduino environment, and select the correct serial port Arduino is using.
By opening the serial monitor, you can see the raw data read from sensor.