Adafruit STCC4 and SHT41 - CO2, Temperature & Humidity Sensor
Adafruit · 6478
6478CO₂ sensors are essential for determining if a room is too 'stuffy' - high CO₂ makes humans grumpy and tired. That's why it's always nice to take a deep breath outside where CO₂ is about 400 ppm.
Air quality
27 other optionsChoose between MQ gas sensors, VOC/eCO2 indoor-air sensors, true CO2 modules and particulate sensors without treating every air-quality breakout as the same detector.
MQ-2 Gas Sensor visual previewMQ-2 Gas Sensor
Combustible gas and smoke sensor: LPG, propane, methane, alcohol, hydrogen and smoke response. Analog output plus a digital threshold pin. Needs heater preheat.
$4.49
MQ-3 Gas Sensor visual previewMQ-3 Gas Sensor
Alcohol-biased MOX sensor for ethanol vapour and breath-alcohol style prototypes. Analog output plus a digital threshold pin. Needs heater preheat.
$5.09
MQ-135 Gas Sensor visual previewMQ-135 Gas Sensor
Broad indoor-pollutant MQ sensor biased to NH3, NOx, benzene, smoke and CO2-style response. Analog output plus a digital threshold pin. Needs heater preheat.
$5.89
Grove - Air quality sensor visual previewGrove - Air quality sensor
Grove indoor-air-quality sensor for a broad mix of CO, alcohol, acetone, thinner and formaldehyde. Single analog index, not a calibrated ppm reading.
Particulate Matter Sensor - SPS30 visual previewParticulate Matter Sensor - SPS30
Sensirion SPS30 optical particulate sensor. Use for PM monitoring, not as a VOC/eCO2 or combustible-gas substitute.
$60.50
Particle, VOC, Humidity, and Temperature Sensor - SEN54 visual previewParticle, VOC, Humidity, and Temperature Sensor - SEN54
Sensirion SEN54 combined module: particulate matter plus VOC, humidity and temperature. Useful upgrade path from PM-only designs, but firmware and airflow change.
$34.95
SparkFun Air Quality Sensor - SGP40 (Qwiic) visual previewSparkFun Air Quality Sensor - SGP40 (Qwiic)
Sensirion SGP40 Qwiic VOC-index sensor. Good for IAQ trends over I2C, not a gas-specific ppm sensor and not true CO2.
$18.95
SparkFun Indoor Air Quality Sensor - ENS160 (Qwiic) visual previewSparkFun Indoor Air Quality Sensor - ENS160 (Qwiic)
ENS160 Qwiic indoor-air-quality sensor with AQI, TVOC and eCO2-style outputs. Not a true CO2 sensor and not an MQ drop-in.
$26.59
Fermion: ENS160 Smart Air Quality Sensor - TVOC/eCO2/AQI Monitor (Breakout) visual previewFermion: ENS160 Smart Air Quality Sensor - TVOC/eCO2/AQI Monitor (Breakout)
ENS160 breakout with TVOC, eCO2 and AQI outputs over I2C/SPI. Similar sensing class to ENS160 Qwiic boards, but connector and board format differ.
$14.90
Fermion: BME688 AI Environmental Sensor (VOC, Temperature, Humidity, Pressure) visual previewFermion: BME688 AI Environmental Sensor (VOC, Temperature, Humidity, Pressure)
BME688 multi-environment sensor: VOC plus temperature, humidity and pressure. Does not replace particulate or direct CO2 measurement.
$12.90
Fermion: SGP40 VOC Air Quality Sensor - Smart IAQ Monitoring (Breakout) visual previewFermion: SGP40 VOC Air Quality Sensor - Smart IAQ Monitoring (Breakout)
SGP40 VOC sensor breakout for indoor-air trend monitoring. Same broad VOC-index branch as SparkFun SGP40, but board format and connector differ.
$14.50
Fermion: BMV080 - World's Smallest Fanless Air Quality Sensor (PM1, PM2.5, and PM10) visual previewFermion: BMV080 - World's Smallest Fanless Air Quality Sensor (PM1, PM2.5, and PM10)
Bosch BMV080 fanless particulate module for PM1, PM2.5 and PM10. Not a VOC/eCO2 or combustible-gas substitute.
$29.90
Adafruit MiCS5524 CO, Alcohol and VOC Gas Sensor Breakout visual previewAdafruit MiCS5524 CO, Alcohol and VOC Gas Sensor Breakout
MiCS-5524 gas sensor breakout for CO, alcohol, VOC/natural-gas leakage style prototypes. Analog MOX-style signal, not a calibrated safety instrument.
$14.95
Adafruit SGP30 Air Quality Sensor Breakout - VOC and eCO2 visual previewAdafruit SGP30 Air Quality Sensor Breakout - VOC and eCO2
SGP30 I2C MOX gas sensor with TVOC and eCO2 outputs. eCO2 is estimated from gas response, so use SCD/STCC modules when direct CO2 matters.
$17.50
Adafruit SCD-30 - NDIR True CO2 Temperature and Humidity Sensor visual previewAdafruit SCD-30 - NDIR True CO2 Temperature and Humidity Sensor
SCD-30 NDIR true-CO2 module with temperature and humidity. Bigger and pricier than SCD-40/SCD-41 style parts, but in the direct CO2 branch.
$58.95
Adafruit SCD-40 - True CO2, Temperature and Humidity Sensor visual previewAdafruit SCD-40 - True CO2, Temperature and Humidity Sensor
SCD-40 compact true-CO2 module with temperature and humidity. Direct CO2 branch, not comparable to eCO2 from SGP30/ENS160.
$44.95
Adafruit SCD-41 - True CO2 Temperature and Humidity Sensor visual previewAdafruit SCD-41 - True CO2 Temperature and Humidity Sensor
SCD-41 compact true-CO2 module with temperature and humidity. Related to SCD-40, but check range/accuracy and firmware assumptions before swapping.
$49.95
Adafruit ENS160 MOX Gas Sensor - Sciosense CCS811 Upgrade visual previewAdafruit ENS160 MOX Gas Sensor - Sciosense CCS811 Upgrade
ENS160 MOX gas sensor breakout with IAQ/TVOC/eCO2-style outputs over I2C. Good CCS811-style upgrade branch, not true CO2.
$21.95
Adafruit ENS161 MOX Gas Sensor visual previewAdafruit ENS161 MOX Gas Sensor
ENS161 MOX gas sensor breakout, same broad indoor-air-quality branch as ENS160. Treat as a firmware/library change until checked.
$21.95
Adafruit PMSA003I Air Quality Breakout visual previewAdafruit PMSA003I Air Quality Breakout
PMSA003I particulate-matter breakout. Put it in the PM branch with SPS30/BMV080/SEN55-style sensors, not the VOC/eCO2 or true-CO2 branch.
$44.95
Adafruit SGP40 Air Quality Sensor Breakout - VOC Index visual previewAdafruit SGP40 Air Quality Sensor Breakout - VOC Index
SGP40 VOC-index breakout. Good sibling to other SGP40 boards; not a true-CO2 sensor and not a particulate sensor.
$14.95
Adafruit SGP41 Multi-Pixel Gas Sensor Breakout - VOC & NOx visual previewAdafruit SGP41 Multi-Pixel Gas Sensor Breakout - VOC & NOx
SGP41 VOC and NOx gas-sensor breakout. A stronger indoor-air-quality path than SGP40 when NOx matters, but still not a direct CO2 or PM sensor.
$19.95
Grove - CO2 Sensor visual previewGrove - CO2 Sensor
Grove NDIR CO2 sensor module. Use when actual CO2 measurement matters; it is not interchangeable with eCO2/VOC-index breakouts.
€108.89
Grove - Multichannel Gas Sensor v2 visual previewGrove - Multichannel Gas Sensor v2
Grove multichannel gas sensor for CO, NO2, alcohol and VOC-style gas detection. Treat as a gas-family board, not true CO2 or particulate measurement.
€35.68
Grove - SEN55 All-in-one environmental sensor - NOx, VOC, RH, Temp, PM1.0/2.5/4/10 visual previewGrove - SEN55 All-in-one environmental sensor - NOx, VOC, RH, Temp, PM1.0/2.5/4/10
Grove SEN55 all-in-one environmental sensor. Covers particulate matter plus VOC/NOx, humidity and temperature, so it can consolidate sensors but changes interface, enclosure and firmware work.
€59.28
Grove - Smart Air Quality Sensor - SGP41 visual previewGrove - Smart Air Quality Sensor - SGP41
Grove SGP41 smart air-quality sensor. Similar sensing branch to Adafruit SGP41, but Grove connector/module format changes wiring and mounting.
€14.51
MICS6814 3-in-1 Gas Sensor Breakout (CO, NO2, NH3) visual previewMICS6814 3-in-1 Gas Sensor Breakout (CO, NO2, NH3)
MICS6814 gas breakout for CO, NO2 and NH3. Useful for multi-gas trend detection, not a substitute for true CO2 or particle sensors.
€28.42
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