SparkFun CO₂ Humidity and Temperature Sensor - SCD40 (Qwiic)
The SparkFun SCD40 breakout board measures CO₂ concentration, humidity, and temperature using Sensirion's PASens photoacoustic measurement technology. The sensor detects CO₂ from 0 to 40,000 ppm with high accuracy over the 400–2,000 ppm range, and includes an integrated CMOSens temperature and humidity sensor for improved readings.
The board connects via I2C through two Qwiic connectors or a standard 2.54 mm (0.1″) header. An automatic self-calibration routine adjusts accuracy over a seven-day period — Sensirion recommends at least one hour of fresh-air readings per day during calibration. The sensor also accepts ambient pressure input for additional accuracy compensation.
Key Features
- Sensirion SCD40 – Photoacoustic CO₂ sensor with integrated temperature and humidity
- CO₂ Range – 0–40,000 ppm
- CO₂ Accuracy – ±(50 ppm + 5% of reading) over 400–2,000 ppm
- Humidity – 0–100% RH, ±9% RH accuracy
- Temperature – −10 to +60°C, ±1.5°C accuracy
- I2C Interface – Address 0x62, dual Qwiic connectors + breakout header
- 2.4–5.5V Supply – 3.3V typical
- Low Power Modes – Normal: 18 mA typical, low power: 3.5 mA, single-shot: 0.5 mA
- Auto Self-Calibration – Seven-day calibration routine for optimal accuracy
Ideal For
- Indoor air quality monitoring
- HVAC and ventilation control systems
- Environmental sensing projects
- Smart building and classroom CO₂ tracking
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Product Information
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Description
The SparkFun SCD40 breakout board measures CO₂ concentration, humidity, and temperature using Sensirion's PASens photoacoustic measurement technology. The sensor detects CO₂ from 0 to 40,000 ppm with high accuracy over the 400–2,000 ppm range, and includes an integrated CMOSens temperature and humidity sensor for improved readings.
The board connects via I2C through two Qwiic connectors or a standard 2.54 mm (0.1″) header. An automatic self-calibration routine adjusts accuracy over a seven-day period — Sensirion recommends at least one hour of fresh-air readings per day during calibration. The sensor also accepts ambient pressure input for additional accuracy compensation.
Key Features
- Sensirion SCD40 – Photoacoustic CO₂ sensor with integrated temperature and humidity
- CO₂ Range – 0–40,000 ppm
- CO₂ Accuracy – ±(50 ppm + 5% of reading) over 400–2,000 ppm
- Humidity – 0–100% RH, ±9% RH accuracy
- Temperature – −10 to +60°C, ±1.5°C accuracy
- I2C Interface – Address 0x62, dual Qwiic connectors + breakout header
- 2.4–5.5V Supply – 3.3V typical
- Low Power Modes – Normal: 18 mA typical, low power: 3.5 mA, single-shot: 0.5 mA
- Auto Self-Calibration – Seven-day calibration routine for optimal accuracy
Ideal For
- Indoor air quality monitoring
- HVAC and ventilation control systems
- Environmental sensing projects
- Smart building and classroom CO₂ tracking
