{"title":"Adafruit SCD-43 True CO2, Temperature & Humidity Sensor","handle":"adafruit-scd-43-true-co2-temperature-and-humidity-sensor","url":"/products/adafruit-scd-43-true-co2-temperature-and-humidity-sensor","description":"This compact breakout measures true ambient CO2 concentration using photoacoustic sensor technology, rather than estimating CO2 from VOC gas concentration. It reports CO2 in parts per million and also includes integrated temperature and humidity sensing, making it useful for indoor air quality, ventilation studies, environmental sensing and scientific experiments.The SCD-43 is the latest wide-range variant in the SCD-4x family, with a 400~5000 ppm CO2 range and improved accuracy compared with earlier versions described by the supplier. It also supports single-shot measurements and is designed for demanding indoor air quality applications.Adafruit has mounted the sensor on a custom STEMMA QT form-factor PCB with I2C data, so it works nicely with many microcontrollers and microcomputers. STEMMA QT connectors on both sides are compatible with SparkFun Qwiic I2C connectors, enabling solderless connections or chaining with other compatible sensors and accessories.The board can run from 3.3 to 5V and includes a 3.3V regulator plus level shifters to help provide a quiet supply and suit 5V microcontrollers such as an Arduino UNO. Arduino and Python/CircuitPython code is available to help you get started quickly, and advanced users can cut or solder backtraces to change regulator and I2C logic-level behaviour.Specifications:Sensor technology: Photoacoustic CO2 sensor technologyIntegrated sensors: Integrated temperature and humidity sensorMeasurement range: 400 ppm – 5000 ppmAccuracy: ±(30 ppm + 3.0 % of reading)Response Time: 60sCurrent consumption: 17 mA (meas. rate = 5 s) / 0.5 mA (meas. rate = 5 min)Calibration: Fully calibrated and linearizedI2C digital interface address: 0x62Sensor Element Size: 10.1mm x 10.1mm x 6.5 mmProduct Dimensions: 25.5mm x 22.8mm x 8.0mm / 1.0\" x 0.9\" x 0.3\"Product Weight: 2.7g / 0.1ozIdeal for maker and research projects that need real CO2 readings over I2C with easy STEMMA QT or Qwiic wiring.","vendor":"Adafruit","product_type":"CO2 Sensor","in_stock":true,"options":[],"variants":[{"id":16437,"title":"Default Title","sku":"AF-6512","mpn":"ADA6512","price":119.23,"on_sale":false,"in_stock":true,"available_quantity":81}],"documents":[{"title":"Supplier page — adafruit.com","type":"supplier_description","type_label":"Supplier Description","url":"https://littlebirdelectronics.com.au/rails/active_storage/blobs/redirect/BAh7BkkiC19yYWlscwY6BkVUewdJIglkYXRhBjsAVGkDdHwDSSIIcHVyBjsAVEkiDGJsb2JfaWQGOwBG--d6c1136de9d95ef7c17f4c787cd4b17432d9985d/adafruit-scd-43-true-co2-temperature-and-humidity-sensor-adafruit-com-2026-08-17.pdf","link":false,"file_extension":"PDF","file_size":596724,"description":"Snapshot of https://www.adafruit.com/product/6512 (captured 17 Aug 2026)"},{"title":"SCD4x Sensor Datasheet","type":"datasheet","type_label":"Datasheet","url":"https://littlebirdelectronics.com.au/rails/active_storage/blobs/redirect/BAh7BkkiC19yYWlscwY6BkVUewdJIglkYXRhBjsAVGkDdXwDSSIIcHVyBjsAVEkiDGJsb2JfaWQGOwBG--57353066aabc65889bb7e17705ced4f3e8d1217b/P6512_CD_DS_SCD4x_Datasheet_D1.pdf","link":false,"file_extension":"PDF","file_size":1302393,"description":"Official Sensirion SCD4x CO2, temperature, and humidity sensor datasheet"}]}