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Product description: SparkFun Photoacoustic Spectroscopy CO2 Sensor - CO2 gas sensor - PASCO2V01 - Qwiic - SparkFun SEN-22956
CO2 gas sensor equipped with the PASCO2V01 system, which performs measurements using photoacoustic spectroscopy . It returns very precise CO2 measurements in the range from 0 ppm to 32,000 ppm , where the highest accuracy is achieved in the range from 400 ppm to 5,000 ppm. The module also contains a microcontroller that converts the data into direct reading in ppm via any of three communication interfaces - I2C , UART and PWM . It is used wherever it is necessary to monitor gas concentration in the air, in applications protecting against gas poisoning or in enterprises using intelligent ventilation systems.
The manufacturer has prepared a number of teaching materials that make it much easier to start working with the sensor. First, check out the user guide !
SparkFun Photoacoustic Spectroscopy CO2 Sensor - CO2 gas sensor - PASCO2V01 - Qwiic - SparkFun SEN-22956.
CO2 gas sensor from SparkFun equipped with the PASCO2V01 system.
Special features of the module
- Measurements are made using photoacoustic spectroscopy, where an integrated microcontroller outputs direct ppm measurements.
- The obtained measurements are characterized by high sensitivity and accuracy, the module can detect even very low CO2 concentrations.
- The photoacoustic method is less susceptible to interference from other gases.
- The sensor does not require frequent calibration and is resistant to external factors, ensuring high measurement stability.
Note: Sensors with the PASCO2V01 chip require a weekly calibration period, measuring every 10 seconds. During this period, the sensor must be outdoors for at least 30 minutes while measurements are taken. Full information on the calibration process can be found in the PAS CO2 FCS and ABOC application note ( manual ) and the PAS CO2 Low Power application note ( manual ).
What is carbon dioxide?
Carbon dioxide is a key factor that affects indoor air quality. High CO2 levels pose a threat to humans - in the initial phase of poisoning, cognitive abilities and well-being deteriorate. The carbon dioxide content should be monitored on an ongoing basis and any deviations from the norm should be reported immediately.
Photoacoustic spectroscopy - what is it?
Photoacoustic spectroscopy is an analytical method based on the photoacoustic effect - the phenomenon involves the generation of sound waves in a material (liquid, gas or solid) as a result of the absorption of electromagnetic radiation, such as light. In photoacoustic spectroscopy, a sample is illuminated with radiation of a specific wavelength. When the sample molecules absorb light energy, the temperature increases locally, which leads to the material expanding and generating an acoustic wave. This method can be used to analyze various types of samples, including solids, liquids and gases.
The photoacoustic method is less susceptible to interference from other gases.
The module has four mounting holes.
Technical specifications of the module
- Type: CO2 gas sensor
- Built-in chip: PASCO2V01
- Measurement method: photoacoustic spectroscopy
- CO2 measurement range: 0 ppm to 32,000 ppm
- Measurement accuracy: ± (30 ppm + 3% of reading)
- Highest measurement accuracy: from 400 ppm to 5,000 ppm
- Permissible ambient temperature range during operation: from 0°C to 50°C
- Operating relative humidity range: 0% to 85% RH
- Operating modes: idle, continuous, single measurement
- Supply voltage ranges:
- VDD3.3: 3V to 3.6V (3.3V typical)
- VDD12: 10.8V to 13.2V (typically 12V)
- Interfaces: I2C, UART, PWM
- I2C bus address: 0x28
- Pins: solder pads, Qwiic connectors
