This air quality combo board senses the atmospheric-quality by using the popular CCS811 and BME280 ICs. It provides a variety of environmental data including barometric pressure, humidity, temperature, TVOCs and equivalent CO2 (or eCO2) levels. Communication is possible through the I2C protocol.
The CCS811 is an exceedingly popular sensor, providing readings for equivalent CO2 (or eCO2) in parts per million (PPM) and total volatile organic compounds in the parts per billion (PPB). The CCS811 also has a feature that allows it to fine-tune its readings if it has access to the current humidity and temperature. Therefore, we added the BME280, which provides humidity, temperature, and barometric pressure. This allows the sensors to work together to give us more accurate readings than they'd be able to provide on their own.
Since the CCS811 heats up a bit, the PCB is precisely designed to not influence the readings of the BME280 sensor.
- CCS811 and BME280 ICs
- eCO2 sensor
- TVOC sensor
- temperature sensor
- humidity sensor
- pressure sensor
- altitude sensor
- operation voltage: 3.3V
- eCO2 sensing: from 400 to 8,192 parts per million
- Total Volatile Organic Compound (TVOC): from 0 to 1,187 parts per billion
- temperature range: -40°C (-40°F) to 85°C (185°F)
- humidity range: 0-100% RH, =-3% from 20-80%
- pressure range: 30,000Pa to 110,000Pa, relative accuracy of 12Pa, absolute accuracy of 100Pa
- alltitude range: 0 to 9.2km (30,000 feet), relative accuracy of 1m (3.3 feet) at sea level, 2m (6.6 feet) at 9.2km (30,000 feet)
- length: 51 mm
- width: 30.4 mm
- height: 5.4 mm
- weight: 4.80 g
The sensors can consume 13mA of current together. It takes 12mA to power the CCS811 while 1mA to power the BME280.