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Grove - Gas Sensor V2(Multichannel)

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We've released the Seeed Gas Sensor Selection Guide, it will help you choose the gas sensor that best suits your needs.

Grove - Multichannel Gas Sensor V2 has 4 measuring units, each of them is sensitive to various kinds of gases, which means you are able to get four sets of data at the same time. And different sorts of gases can also be judged by these four sets of data. The gas sensor used in this module is based on MEMS technology and has the advantage of being in a small size with considerable measurement stability and is more suitable for qualitative than quantitative measurement.

Features​

  • Four fully independent sensor elements on one package.
  • The ability to detect a variety of gases, besides Carbon monoxide (CO), Nitrogen dioxide (NO2), Ethyl alcohol(C2H5CH), Volatile Organic Compounds (VOC) and etc.
  • Qualitative detecting, rather than quantitative.
  • Compact size for easy deployment.

Specification​

ItemValue
MCUSTM32F030
InterfaceGrove I2C
I2C address0x55
Output voltage3.3V~5V
SensorsGM-102B; GM-302B; GM-502B; GM-702B

GM-102B

Type of productGM-102B
V0(V)2.5-4.5
V0-VS(V)≥1.0
LoadAdjustable
Response time（tres，S）≤30
Recovery Time（trec，S）≤60
Heating resistance（RH，Ω）80±20
Operating Voltage（V）VH=2.0±0.1 AC or DC VC=5.0±0.1DC

GM-302B

Type of productGM-302B
Standard packageCeramic package
Concentration1～500ppm


Standard circuit conditions
Loop voltageVC≤24V DC
Heating VoltageVH2.5V±0.1V AC or DC
Load ResistanceRLAdjustable





Gas sensor characteristics under standard test conditions		Heating resistanceRH60~100Ω（Room Temperature）
Heating power consumptionPH≤50mW
Sensitive body resistanceRS1KΩ～30KΩ(in 50ppm Ethanol )
SensitivitySRs(in air)/Rs(in 50ppm Ethanol )≥3.0
Concentration slopeα≤0.9(R200ppm/R50ppm Ethanol )


Standard test conditions		Temperature/Humidity20℃±2℃；55%±5%RH
Standard test circuitVH:2.5V±0.1V； VC:5.0V±0.1V
Preheat timeLess than 48hrs

GM-502B

Type of productGM-502B
Standard packageCeramic package
Concentration1～500ppm
Standard circuit conditions

Loop voltageVC≤24V DC
Heating VoltageVH2.5V±0.1V AC or DC
Load ResistanceRLAdjustable




Gas sensor characteristics under standard test conditions		Heating resistanceRH80Ω ± 20Ω（Room temperature）
Heating power consumptionPH≤50mW
Sensitive body resistanceRS1KΩ～30KΩ (in 50ppm Ethanol)
SensitivitySR0 (in air) / Rs (in 50ppm Ethanol) ≥3.0
Concentration slopeα≤0.9 (R200ppm / R50ppm Ethanol)
Standard test conditions
Temperature / Humidity20℃ ± 2℃；55% ± 5%RH
Standard test circuit
VH:2.5V ± 0.1V；
VC:5.0V ± 0.1V

GM-702B

Type of productGM-702B
Standard packageCeramic package
Concentration5～5000ppm(CO)

Standard circuit conditions
Loop voltageVC≤24V DC

Heating Voltage		VH2.5V±0.1V AC or DC（High Temperature）
0.5V±0.1V AC or DC（Low Temperature）
Load ResistanceRL60s±1s（H. T)；90s±1s（L. T）




Gas sensor characteristics under standard test conditions		Heating resistanceRHAdjustable
Heating power consumptionPH80Ω±20Ω（Room temperature）
Sensitive body resistanceRS≤50mW
SensitivityS1KΩ～30KΩ(in 150ppmCO)
Concentration slopeαR0(in air)/Rs(in 150ppmCO)≥3

Standard test conditions
Temperature / Humidity20℃±2℃；55%±5%RH
Standard test circuitVH: 2.5V±0.1V（H. T）
0.5V±0.1V（L. T） VC : 5.0V±0.1V

Sample test outcomes​

result outcome

Characteristic descriptions​

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Rs in the figure represents the resistance value of the sensorin different concentrations of gas; R0 represents the resistance value of the sensor in clean air. All tests in the picture are completed under standard test conditions. Yellow line is Toluene, blue line is Ethanol, red line is Acetone and purple line is Formaldehyde, which is the same as the ones in charts below.

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The output voltage in Chart 3 is the voltage across the load resistance (RL) of the sensor in series. The test in the figure is completed under standard test conditions, with a test gas of 50 ppm ethanol. The output voltage in Chart 4 is the voltage across the load resistance (RL) of the sensor in series. All tests in the figure are completed under standard test conditions.

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Rs in Chart 5 represents the resistance value of the sensorin different concentrations of gas; R0 represents the resistance value of the sensor in clean air. All tests in the picture are completed under standard test conditions. Yellow line is Toluene, blue line is Ethanol, red line is Acetone and purple line is Formaldehyde, which is the same as the ones in charts below. In Chart 6, Rs represents the resistance value under 50ppm ethanol and various temperatures / humidities; Rs0 represents the resistance value under 50ppm ethanol, 20 ℃ and 55% RH.

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The output voltage in Chart 7 is the voltage across the load resistance (RL) of the sensor in series. The test in the figure is completed under standard test conditions, with a test gas of 50 ppm ethanol. The output voltage in Chart 8 is the voltage across the load resistance (RL) of the sensor in series. All tests in the figure are completed under standard test conditions.

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In Chart 9, Rs represents the resistance of the sensor in different concentrations of gas Value; R0 represents the resistance value of the sensor in clean air. All tests in the picture are completed under standard test conditions. The black line is for CO, red one is CH4, Purple is for H2 and pink one is Air.In Chart 10 , Rs represents the temperature at 150ppmCO and various temperatures / humidities. Resistance value; Rs0 means resistance value under 150ppmCO, 20 ℃, 55% RH.

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The voltage in Chart 11 is the voltage across the load resistance (RL) of the sensor in series. The test in the picture is completed under standard test conditions, test gas 150ppmCO. The output voltage in Chart 12 is the voltage across the load resistance (RL) of the sensor in series. All tests in the picture are completed under standard test conditions.

Platform Supported​

ArduinoRaspberry Pi

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Getting Started​

Materials Requied​

Wio TerminalGrove-Multichannel Gas Sensor V2
Get ONE NowGet ONE Now

Hardware Overview​

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note

The module in the image of Hardware Connection has the same arrangement as the one in the image of Hardware Diagram above. As you can see in the Hardware Diagram, the outlined area in the left is the Grove Interface. And there are four squares with tiny holes refer to the gas sensors. When the board with sensors is connected with Wio Terminal, the information of the gases will display on the screen.

  • Step 1. Connect Grove - Multichannel Gas Sensor V2 to port I2C of Grove-Base Shield. Plug Grove - Base Shield into Wio Terminal. And connect Wio Terminal to PC via a USB cable.

  • Step 2. Download the Grove_Multichannel_Gas_Sensor_v2 Library from Github. And refer How to install library to install library for Arduino.

  • Step 3. Copy the code into Wio Terminal and upload. If you do not know how to upload the code, please check how to upload code.

  • Step 4. Refer How to TFT LCD Library to install TFT LCD Library. Lastly, upload code from the Software Code below and the data has to be displayed successfully.

Software Code​

#include <TFT_eSPI.h>
#include <Multichannel_Gas_GMXXX.h>
#include <Wire.h>
GAS_GMXXX<TwoWire> gas;

TFT_eSPI tft; 
// Stock font and GFXFF reference handle
TFT_eSprite spr = TFT_eSprite(&tft);  // Sprite 

void setup() {
  // put your setup code here, to run once:
  tft.begin();
  tft.setRotation(3);
  spr.createSprite(tft.width(),tft.height()); 
  gas.begin(Wire, 0x08); // use the hardware I2C
}

void loop() {
  // put your main code here, to run repeatedly:
  int val;
  spr.fillSprite(TFT_BLACK);
  spr.setFreeFont(&FreeSansBoldOblique18pt7b); 
  spr.setTextColor(TFT_BLUE);
  spr.drawString("Gas Terminal", 60 - 15, 10 , 1);// Print the test text in the custom font
  for(int8_t line_index = 0;line_index < 5 ; line_index++)
  {
    spr.drawLine(0, 50 + line_index, tft.width(), 50 + line_index, TFT_GREEN);
  }
  
  spr.setFreeFont(&FreeSansBoldOblique9pt7b);                 // Select the font
  // GM102B NO2 sensor
  val = gas.getGM102B();
  if (val > 999) val = 999;
  spr.setTextColor(TFT_WHITE);
  spr.drawString("NO2:", 60 - 24, 100 -24 , 1);// Print the test text in the custom font
  spr.drawRoundRect(60 - 24,100,80,40,5,TFT_WHITE); 
  spr.setTextColor(TFT_WHITE);
  spr.drawNumber(val,60 - 20,100+10,1);
  spr.setTextColor(TFT_GREEN);
  // GM302B C2H5CH sensor
  val = gas.getGM302B();
  if (val > 999) val = 999;
  spr.setTextColor(TFT_WHITE);
  spr.drawString("C2H5CH:", 230 -24 , 100 - 24 , 1);// Print the test text in the custom font
  spr.drawRoundRect(230 - 24,100,80,40,5,TFT_WHITE);
  spr.setTextColor(TFT_WHITE);
  spr.drawNumber(val,230 - 20,100+10,1);
  spr.setTextColor(TFT_GREEN);
  // GM502B VOC sensor
  val = gas.getGM502B();
  if (val > 999) val = 999;
  spr.setTextColor(TFT_WHITE);
  spr.drawString("VOC:", 60 - 24, 180 -24 , 1);// Print the test text in the custom font
  spr.drawRoundRect(60 - 24,180,80,40,5,TFT_WHITE);
  spr.setTextColor(TFT_WHITE);
  spr.drawNumber(val,60 - 20,180+10,1);
  spr.setTextColor(TFT_GREEN);
  // GM702B CO sensor
  val = gas.getGM702B();
  if (val > 999) val = 999;
  spr.setTextColor(TFT_WHITE);
  spr.drawString("CO:", 230 -24 , 180 - 24, 1);// Print the test text in the custom font
  spr.drawRoundRect(230 - 24 ,180,80,40,5,TFT_WHITE);
  spr.setTextColor(TFT_WHITE);
  spr.drawNumber(val ,230 - 20 ,180+10,1);
  spr.setTextColor(TFT_GREEN);
  
  spr.pushSprite(0, 0);
  delay(100);

}
caution
  • The module should avoid being placed in the volatile silicon compound steam, or it will cause the sensitivity to be reduced and irrecoverable.
  • The module should avoid being exposured to high concentrations of corrosive gases (such as H2S, SOX, Cl2, HCl, etc.), otherwise it will be irreversibly damaged.
  • The module should not be placed in water or ice.
  • After the module is powered on, the sensor will heat up to a certain degree during the process, which is a normal phenomena.
  • Users MUST preheat the module before starting measuring gases.
  • The values obtained by this sensor are analog values and can only be used as a result of qualitative measurements and not for quantitative measurements.

Schematic Online Viewer​

Resources​

Tech Support & Product Discussion​

Upgradable to Industrial Sensors​

With the SenseCAP S2110 controller and S2100 data logger, you can easily turn the Grove into a LoRaWAN® sensor. Seeed not only helps you with prototyping but also offers you the possibility to expand your project with the SenseCAP series of robust industrial sensors.

The IP66 housing, Bluetooth configuration, compatibility with the global LoRaWAN® network, built-in 19 Ah battery, and powerful support from APP make the SenseCAP S210x the best choice for industrial applications. The series includes sensors for soil moisture, air temperature and humidity, light intensity, CO2, EC, and an 8-in-1 weather station. Try the latest SenseCAP S210x for your next successful industrial project.

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