CCS811+BME280 CO2 Air Quality Environmental Sensor

This DFRobot environmental module combines a gas sensor for eCO2 (CO2 equivalent) and TVOC (total volatile organic compounds) with the Bosch BME280 for temperature, humidity and air pressure. Both sensors are read via I2C, a small evaluation logic sits in the gas sensor. The module is suitable for indoor air monitoring, air purifiers and ventilation controls.

Note: Depending on the delivery, the board carries the ams CCS811 or the ScioSense ENS160 gas sensor. DFRobot now lists the SEN0335 module with ENS160 and describes the CCS811 version as V1.0. Library and I2C address differ, so check the marking. The CCS811 requires a special I2C clock and is therefore not compatible with some controllers such as the Raspberry Pi.

eCO2 is a value calculated from the measured gases, not a direct CO2 measurement. An infrared sensor is suitable for a true CO2 measurement.

Recommended alternative for true CO2 measurement: Gravity I2C SCD41 Infrared CO2 Sensor

Features:

• eCO2 and TVOC from the gas sensor, temperature, humidity and air pressure from the BME280
• I2C interface, operation with 3.3 V or 5 V
• Short warm-up time and low power consumption
• Alarm via the INT pin when a threshold is exceeded
• Several measuring modes for battery-powered applications

Application Examples:

• Monitoring indoor air quality at home, in the office or in the car
• Air purifiers and ventilation control
• Weather station with air quality

Documentation:

• DFRobot wiki, current version with ENS160 and version V1.0 with CCS811
• Schematic V1.0 (PDF)

Technical Data:

• Operating voltage: 3.3 V to 5.5 V
• Operating current: below 20 mA
• Interface: I2C
• Connections CCS811 version: VCC, GND, SCL, SDA, INT, WAKE, RST
• CCS811: address 0x5A (default) or 0x5B, TVOC 0 to 1100 ppb, eCO2 400 to 8000 ppm, sleep current 0.7 µA, 5 measuring modes
• ENS160: address 0x53 (default) or 0x52, TVOC 0 to 65000 ppb, eCO2 400 to 65000 ppm, warm-up time below 3 minutes
• BME280: address 0x76 (default) or 0x77, temperature -40 °C to 85 °C (±0.5 °C, resolution 0.1 °C), humidity 0 to 100 %RH (±2 %RH), air pressure 300 to 1100 hPa
• Dimensions: 20 × 28 × 8.5 mm
• Weight: 8.5 g

Scope of Delivery:

• 1× CCS811+BME280 CO2 Air Quality Environmental Sensor
• 1× pin header 1×7 pin