Description The M5Stack CO2L Unit is a compact digital air quality unit for CO2 concentration, temperature, and humidity monitoring. It uses Sensirion's SCD41 sensor, an integrated power step-down circuit, and an I2C interface, making it easy to add environmental sensing to M5Stack controllers and automation projects. The CO2 temperature humidity sensor measures CO2 from 400 ppm to 5000 ppm with typical CO2 accuracy of +/-(40 ppm + 5% of reading). Low-power single measurement support makes the I2C CO2L environmental sensor useful for periodic air quality checks, indoor monitoring, and battery-conscious systems. Features CO2 concentration detection: SCD41 sensor supports 400 ppm to 5000 ppm measurement range. Temperature and humidity monitoring: reads ambient temperature from -10 to 60 degC and humidity from 0 to 95 %RH. Low power mode: supports single measurement operation for reduced power use. I2C interface: communicates at address 0x62 through the HY2.0 4P Grove connector. Integrated power conversion: onboard 5V to 3.3V LDO supports the sensor circuit. Mounting friendly: includes two LEGO compatible holes for quick fixture and enclosure use. Specifications Sensor SCD41 CO2 Range 400 to 5000 ppm CO2 Accuracy +/-(40 ppm + 5% of reading) Temperature Range -10 to 60 degC Humidity Range 0 to 95 %RH Communication Interface I2C @0x62 Connector HY2.0 4P Power Conversion Integrated 5V to 3.3V LDO Product Size 48.0 x 24.0 x 16.0mm Product Weight 7.5g Package Size 138.0 x 93.0 x 17.0mm Gross Weight 12.8g Applications Indoor CO2 concentration detection Temperature and humidity monitoring Smart home air quality sensing Classroom, office, and workshop ventilation monitoring Low-power periodic environmental data collection Product List 1 Unit CO2L 1 HY2.0 connecting cable (20CM) Other Content The Unit CO2L uses a single-shot measurement mode for lower power operation. This is helpful when a project only needs periodic CO2, temperature, and humidity readings instead of continuous measurement. Grove Pin Signal Black GND Red 5V Yellow SDA White SCL Before installation, keep airflow around the sensor opening unobstructed and avoid placing the CO2 temperature humidity sensor next to direct heat sources, condensation, or strong drafts that could distort environmental readings. Resources Product documentation Schematic PDF Schematic image SCD41 datasheet VRH3301NLX datasheet Pin map Arduino example for M5Core Arduino example for M5Atom UIFlow1 documentation UIFlow2 documentation EasyLoader test tool Home Assistant integration FAQ What does the M5Stack CO2L Unit measure? It measures CO2 concentration, ambient temperature, and relative humidity through the SCD41 sensor. What is the I2C address? The M5Stack CO2L Unit communicates through I2C at address 0x62. When should single measurement mode be used? Single measurement mode is useful for low-power projects that only need occasional air quality readings instead of continuous sampling.
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