Seeed Studio Studio Grove HCHO Formaldehyde Gas Sensor - WSP2110 VOC Detector

The sensor requires a stable 5.0V DC supply, with a tolerance of ±0.3V. It is designed to be powered directly from the 5V pin on Arduino boards or the Grove system's VCC line. Exceeding this voltage range may damage the sensor's internal circuitry.

Connect the module's Grove 4-pin connector to a Grove-compatible shield or base board. The SIG pin provides an analog voltage output. Connect this pin to an analog input (ADC) on your microcontroller (e.g., Arduino A0). Read the ADC value; a higher voltage corresponds to a higher concentration of target VOCs in the air.

This sensor is primarily sensitive to formaldehyde (HCHO) but also responds to benzene, toluene, and alcohol vapors. Its effective detection range is from 1 part per million (ppm) up to 50 ppm for these volatile organic compounds. It provides a qualitative to semi-quantitative indication of VOC levels.

For accurate quantitative measurements, periodic calibration using known gas concentrations is recommended. The analog output provides a relative indication of gas presence. For project use, you can establish a baseline reading in clean air and monitor for significant deviations above that baseline.

This sensor is designed primarily for indoor air quality monitoring and educational applications. It is not IP-rated for waterproofing and may be affected by extreme temperatures, humidity, or high concentrations of non-target gases. For harsh industrial environments, dedicated industrial-grade transmitters are required.