{"title":"SparkFun Air Quality Sensor - SGP40 (Qwiic)","handle":"sparkfun-air-quality-sensor-sgp40-qwiic","url":"/products/sparkfun-air-quality-sensor-sgp40-qwiic","description":"The SparkFun SGP40 Air Quality Sensor measures volatile organic compound (VOC) levels in indoor environments using Sensirion's CMOSens technology. The metal oxide (MOx) sensor with a temperature-controlled micro hotplate provides humidity-compensated air quality readings via I2C with Qwiic connectors for easy integration.\n\nRather than returning specific gas concentrations, the SGP40 outputs a digital value based on common indoor VOCs. Combined with Sensirion's VOC Index Algorithm, it detects the relative intensity of VOC events compared to average readings over a 24-hour period — think of it as an electronic nose for your room.\n\nKey Features\n\n\nSensirion SGP40 Sensor – MOx-based VOC detection with humidity compensation\n\nQwiic / I2C Interface – Two Qwiic connectors for daisy-chaining; I2C address 0x59\n\nVOC Index Output – Processed output from 0–500 VOC Index points, plus raw signal (SRAW) 0–65535 ticks\n\nFast Start-Up – Reliably detects VOC events in under 60 seconds; meets full specifications within 1 hour\n\nLow Power – 2.6 mA during continuous operation at 3.3 V; 34 μA idle with heater off\n\nLong-Term Stability – Robust against contaminating gases with low drift and minimal device-to-device variation\n\n\nSpecifications\n\n\nOperating Voltage – 1.7–3.6 V (typical 3.3 V via Qwiic)\n\nCurrent (Active) – 2.6 mA at 3.3 V\n\nCurrent (Idle) – 34 μA (heater off)\n\nI2C Address – 0x59\n\nRecommended Sampling Interval – 1 s (VOC Index); 0.5–10 s (SRAW)\n\n\nIdeal For\n\nIndoor air quality monitoring\nSmart home and HVAC systems\nEnvironmental sensing projects\nAir purifier control and ventilation feedback\n\n\nPackage Contents\n\n1× SparkFun SGP40 Air Quality Sensor (Qwiic)\n\n\nResources\n\nHookup Guide\nSGP40 Datasheet (PDF)\nSchematic (PDF)\nVOC Index for Experts (PDF)\nSGP40 Design-In Guide (PDF)\nArduino Library (GitHub)\nPython Package (GitHub)\nHardware Design Files (GitHub)\n","vendor":"SparkFun","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":3132,"title":"Default Title","sku":"SF-SEN-18345","price":39.03,"on_sale":false,"in_stock":true,"available_quantity":12,"option1":"Default Title"}]}