광음향 분광 이산화탄소 센서 -XENSIV PAS CO2
(SparkFun Photoacoustic Spectroscopy CO2 Sensor - PASCO2V01 (Qwiic))
- 본 제품은 광음향 분광 이산화탄소 센서 -XENSIV PAS CO2 입니다.
- 광음향 분광법을 사용한 XENSIV PAS CO2 이산화탄소 센서를 탑재한 제품으로 매우 높은 정교성을 가진 제품입니다.
- I2C, UART, PWM 인터페이스를 가지고 있습니다.
- Three Communication Interfaces:
- I2C (Default)
- Address: 0x28
- 2x Qwiic Connectors
- I2C (Default)
- Supply Voltage Ranges:
- VDD3.3: 3.0-3.6V (3.3V Typ.)
- VDD12: 10.8-13.2V (12V Typ.)
- Photoacoustic Spectroscopy Measurement System
- Integrated microcontroller outputs direct ppm measurements
- Three Operating Modes:
- CO2 Measurement Range: 0-32,000ppm
- Max CO2 Measurement Accuracy: ±(30ppm + 3% of reading)
- Max Accuracy Conditions: Reading between 400ppm & 5,000ppm
- Operating Ambient Temperature Range: 0-50°C
- Operating Relative Humidity Range: 0-85%RH
The SparkFun Photoacoustic Spectroscopy CO2 Sensor features the XENSIV™ PAS CO2 sensor package from Infineon©, which measures highly accurate CO2 data in direct parts-per-million (ppm) format over I2C, UART, and PWM. The PAS CO2 employs a photoacoustic spectroscopy measurement system that combines narrow-band filtered IR light and a highly sensitive microphone inside the sensing cavity to measure CO2 concentrations from 0 to 32,000ppm with a best accuracy of ±(30ppm + 3%) when reading between 400ppm and 5,000ppm. It also includes a microcontroller that converts the data into direct ppm readout over any of the three communication interfaces.
The IR emitter on the PAS CO2 requires a 12V supply, so we've included an AP3012 boost regulator with a series of decoupling capacitors to output a clean 12V from the 3.3V sourced through a Qwiic connection. As a result, this board comes in slightly larger than the standard 1in. x 1in. Qwiic breakouts and measures 1in. x 1.6in. This breakout routes the I2C bus to a pair of Qwiic connectors, but we've also broken out all of the PAS CO2 sensor's pins to 0.1in. spaced headers so users can pick their communication method and power supply of choice.
The PAS CO2's interrupt pin has unique functionality beyond a typical hardware interrupt to signal alarm thresholds, data ready, and sensor busy statuses. Users can also configure it to activate as an early measurement start notification during continuous reading and tie it to the boost regulator's enable pin to turn it on only during active measurements to conserve power. To help make this easier, we've routed these two pins to adjacent through-hole pins.
Note: The PASCO2V01 sensors require a week-long calibration period, measuring every 10 seconds. During that period, the sensor must be outside for at least 30 minutes while taking measurements. Refer to the "Automatic baseline offset correction (ABOC) and forced compensation scheme (FCS)" application note in the Documents tab for complete information about the calibration process.