Grove - HCHO Sensor

Up to 1ppm high sensibility, built with VOC sensor WSP2110 and detects HCHO, Benzene,Toluene, Alcohol etc. It is Grove connector compatible and easy to use

1 Stück

16,90 (Grundpreis: 16,90 € / Stück)

inkl. 19 % MwSt. zzgl. Versandkosten

Sofort versandfertig, Lieferzeit 48h


The Grove - HCHO Sensor is a semiconductor VOC gas sensor. Its design is based on WSP2110 whose conductivity changes with the concentration of VOC gas in air. Through the circuit, the conductivity can be converted to output signal that corresponding to the gas concentration. This sensor has a very high sensitivity and stability, it can detect the gas whose concentration is up to 1ppm. It’s suitable for detecting formaldehyde, benzene, toluene and other volatile components. This product can be used to detect harmful gas in the home environment. Therefore, it’s a good assistant for you to improve indoor environment quality of life.




The sensor value only reflects the approximated trend of gas concentration in a permissible error range, it DOES NOT represent the exact gas concentration. The detection of certain components in the air usually requires a more precise and costly instrument, which cannot be done with a single gas sensor. If your project is aimed at obtaining the gas concentration at a very precise level, then we do not recommend this gas sensor.





  •  ŸOperating Voltage: 5.0V ± 0.3V  

  •  ŸTarget Gases: HCHO, Benzene,Toluene, Alcohol 

  •  ŸConcentration Range: 1~50 ppm 

  •  ŸSensor Resistance Value(Rs): 10KΩ-100KΩ(in 10ppm HCHO) 

  •  ŸSensitivity: Rs(in air)/Rs(10ppm HCHO)≥5

Platforms Supported

Arduino Wio BeagleBone Raspberry Pi LinkIt ONE


The platforms mentioned above as supported is/are an indication of the module's hardware or theoritical compatibility. We only provide software library or code examples for Arduino platform in most cases. It is not possible to provide software library / demo code for all possible MCU platforms. Hence, users have to write their own software library.

Getting Started

With Arduino

The Grove - HCHO Sensor can be used to detect VOCs, such as HCHO,toluene, benzene, alcohol. Here we take alcohol for an example to demonstrate how to use this sensor.

// demo of Grove - HCHO Sensor
void setup()
void loop()
    int sensorValue=analogRead(A0);
    float Vol=sensorValue*4.95/1023;
    Serial.print("Vol = ");

After uploading the code, open the serial monitor to get the voltage(Vol) under normal condition.

Now list out the formula describing the relationship of Vol and R0:

R0=(Vc/Vol-1)×R1 (Vc=4.95V) ①

Then put a bottle of alcohol near the sensor, and read again the sensor value:

And we get the Rs:

Rs = (Vc/Vol-1)×R1 (Vc=4.95V) ②

Now calculate Rs/R0. Here we get 0.285. Then refer to the sensitivity characteristic diagram below and find the alcohol concentration is about 5 ppm.

With Raspberry Pi

1.You should have got a raspberry pi and a grovepi or grovepi+.

2.You should have completed configuring the development enviroment, otherwise follow here.


  • Plug the sensor to grovepi socket A0 by using a grove cable.

4.Navigate to the demos’ directory:

    cd yourpath/GrovePi/Software/Python/
  • To see the code
    nano   # "Ctrl+x" to exit #
    import time
    import grovepi

    # The sensitivity can be adjusted by the onboard potentiometer

    # Connect the Grove HCHO Sensor to analog port A0
    hcho_sensor = 0


    # Vcc of the grove interface is normally 5v
    grove_vcc = 5

    while True:
            # Get sensor value
            sensor_value = grovepi.analogRead(hcho_sensor)

            # Calculate voltage
            voltage = (float)(sensor_value * grove_vcc / 1024)

            print "sensor_value =", sensor_value, " voltage =", voltage

        except IOError:
            print "Error"

5.Run the demo.

    sudo python


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