SHANGHAI -- November 12, 2026 -- DFRobot and Sensirion launched the Gravity: SFA40 Formaldehyde (HCHO) Module, a formaldehyde sensor board now on sale in DFRobot's online store for $49.50. The SFA40 formaldehyde module measures 0–1000 ppb, but the companies specify its typical accuracy only for the 0–200 ppb band, which is one-fifth of that range.
DFRobot builds the module around Sensirion's SFA40 chip
The board uses Sensirion's SFA40 electrochemical sensing chip and DFRobot's Gravity 4-pin interface. The companies say it connects to development platforms such as Arduino and Raspberry Pi. An integrated SHT4X temperature and humidity sensor compensates for environmental changes automatically.
The companies state cross-sensitivity to ethanol is below 0.3%, which they say limits interference from alcohol and perfume. DFRobot offers an SCI firmware version for serial data reading without programming, compatibility with Mind+ graph