DescriptionSeeed Studio Grove Formaldehyde Sensor (SFA30) is a dedicated HCHO sensor module for indoor air-quality projects. Its Sensirion SFA30 electrochemical cell measures formaldehyde over a 0–1000 ppb standard range with low cross-sensitivity to ethanol. An integrated humidity/temperature sensor compensates the HCHO readings as room conditions change.The Grove formaldehyde sensor operates from 3.3 V or 5 V and supports both I²C and UART through its selectable interface. Pair it with compatible Grove hardware to prototype a home air-quality monitor, ventilation controller or purifier feedback system. This board is a sensor module, not a finished certified alarm, air purifier or controller. Features Targeted HCHO sensing: Sensirion SFA30 electrochemical technology measures formaldehyde rather than reporting a generic TVOC estimate. Low false-alarm tendency: low cross-sensitivity to ethanol and humidity/temperature compensation support more dependable indoor readings. Useful resolution: 1 ppb HCHO resolution and a detection limit below 20 ppb under datasheet conditions. Defined response: response to a concentration change in less than two minutes under specified conditions. Two digital interfaces: choose I²C or UART on the board; use the matching connector and software example. Grove integration: use a compatible Grove Base Shield or Raspberry Pi Grove Base Hat for rapid development. Additional readings: the SFA30 reports relative humidity and local temperature alongside HCHO concentration. Long service design: factory-calibrated output, anti-dry electrochemical cell and a service-life specification above six years at standard conditions. Specifications Product name Grove - Formaldehyde Sensor (SFA30) Product type Grove HCHO sensor module Formaldehyde sensing element Sensirion SFA30 electrochemical cell Compensation Integrated Sensirion temperature/humidity sensor Measured outputs HCHO concentration, relative humidity, local temperature Standard HCHO measurement range 0–1000 ppb HCHO resolution 1 ppb HCHO detection limit Below 20 ppb HCHO accuracy ±20 ppb or ±20% of reading, whichever is larger; 0–200 ppb at datasheet reference conditions HCHO repeatability ±5 ppb or ±5% of reading, whichever is larger Response time Less than 2 minutes to a concentration change Standard operating environment 0–40 °C; 10–90% RH, non-condensing Supply voltage 3.3 V or 5 V at the Grove board Digital interface Selectable I²C / UART Board connection Grove connector; 5-pin header supplied separately in the package Service life More than 6 years at standard conditions Supported development platforms Arduino and Raspberry Pi with appropriate Grove interface and software Applications Indoor air-quality prototype: log ppb-level formaldehyde trends in a home, office or classroom. Post-renovation monitoring: compare HCHO readings over time as ventilation and materials change. Smart ventilation research: trigger a prototype fan-control workflow from measured HCHO levels. Air-purifier feedback: evaluate how a prototype purifier affects formaldehyde concentration. Building-automation development: combine HCHO, temperature and humidity data with an Arduino or Raspberry Pi gateway. Education and laboratory work: study electrochemical sensing, interference and environmental compensation. Product List 1 × Grove Formaldehyde Sensor (SFA30) board 1 × 5-pin header Other ContentFor an Arduino setup, select the board’s I²C mode and connect it through a compatible Grove Base Shield V2.0. Install the Sensirion I2C SFA3X library before using the Seeed example. The shield, host board and Grove cable are separate items, not part of this sensor’s package.For Raspberry Pi, use a compatible Grove Base Hat and the linked Seeed instructions. Check pin voltage and the module’s interface-switch position before applying power.Measurement conditions: the accuracy figure applies to the stated datasheet reference conditions; readings can differ outside the standard operating environment. Do not use this module as a safety-critical or certified exposure alarm.Sensor interface and switchArduino Grove connectionRaspberry Pi Grove connection Resources Seeed Grove Formaldehyde Sensor Wiki Sensirion SFA30 Datasheet (PDF) Sensirion I2C SFA3X Arduino Library Seeed Grove Base Shield V2 Wiki Seeed Grove Base Hat for Raspberry Pi Wiki FAQWhat does the Grove SFA30 sensor measure?It reports formaldehyde concentration in ppb, plus local temperature and relative humidity used for compensation.Is this a general VOC sensor?No. It uses a dedicated SFA30 electrochemical cell for HCHO and has low cross-sensitivity to ethanol.Can I use I²C and UART?Yes. The board has a selectable I²C/UART interface; set the switch and use software for the selected mode.Does the package include an Arduino, Raspberry Pi or Grove shield?No. The listed package contains one Grove SFA30 sensor board and one 5-pin header. Controllers, shields, hats and cables are separate.What voltage and HCHO range does it support?The Grove board accepts 3.3 V or 5 V, and the standard formaldehyde measurement range is 0–1000 ppb.
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