Description The Seeed Studio Grove HCHO Sensor is a Grove analog gas sensor for detecting volatile organic compounds such as formaldehyde (HCHO), toluene, benzene, alcohol and acetone. Built around the WSP2110 VOC sensor, it converts changes in sensor conductivity into a 0 to 5 V output signal for indoor air quality and harmful gas detection projects. The module is designed for Grove plug-and-play prototyping and has high sensitivity down to 1 ppm class detection according to the official product page. It is suitable for trend monitoring and educational air-quality experiments; for precise gas concentration measurement, calibrate the sensor and follow the official wiki guidance. Other Content The official wiki warns that the sensor value only reflects the approximate trend of gas concentration within an allowable error range. It does not represent exact gas concentration, and projects that require precise concentration values should use more accurate dedicated instruments. The wiki also points users to the Seeed Gas Sensor Selection Guide for choosing a gas sensor that better matches a specific application. Features Detects VOCs such as HCHO, toluene, benzene, alcohol and acetone. WSP2110 sensing element with high sensitivity for low-concentration gas trend detection. 0 to 5 V analog output for simple reading by Grove-compatible controllers. Stable performance and long sensor life for continuous monitoring experiments. Grove connector for quick prototyping without custom wiring. Applications Indoor air quality monitoring Formaldehyde and VOC trend detection Automatic exhaust and air purifier projects Smart home environmental sensing Gas sensor learning and prototyping Specifications Operating Voltage 5.0 V +/- 0.3 V Target Gases HCHO, benzene, toluene, alcohol Concentration Range 1 to 50 ppm Sensor Resistance Value 10K Ohm to 100K Ohm in 10 ppm HCHO Sensitivity Rs in air / Rs in 10 ppm HCHO >= 5 Output Voltage 0 to 5 V Sensor WSP2110 Dimensions 40 x 20 x 15 mm Gross Weight 9 g Battery Exclude Hardware Overview The sensor element changes conductivity as the concentration of target VOC gases changes. The module converts that change into an analog voltage, allowing a microcontroller to monitor the gas trend through an ADC input. For best results, use the official wiki examples and sensitivity curve as a reference, and calibrate the sensor for the target environment before relying on measured values. Part List Grove HCHO Sensor x 1 Grove cable x 1 Resources Grove HCHO Sensor wiki and getting started guide Grove HCHO Sensor Eagle design file Grove HCHO Sensor schematic PDF WSP2110 VOC sensor datasheet (English) WSP2110 VOC sensor datasheet (Chinese) Seeed Gas Sensor Selection Guide FAQ What gases can this sensor detect? It is designed for VOC trend detection, including HCHO, benzene, toluene and alcohol according to the official specifications. What type of output does it provide? The module provides a 0 to 5 V analog output that can be read by a microcontroller ADC input. Can it measure exact formaldehyde concentration? No. The official wiki states that the sensor value reflects an approximate trend rather than exact gas concentration. Use a dedicated calibrated instrument for precise measurement. What is included in the package? The official part list includes one Grove HCHO Sensor and one Grove cable.
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