Soldered SCD43 CO2 Sensor Breakout

The Soldered SCD43 CO2 Sensor Breakout measures real carbon dioxide in the air around it. It does not estimate "equivalent" CO2 from a gas sensor, but takes a true optical reading from Sensirion's SCD43, a second-generation photoacoustic NDIR sensor and the most accurate member of its family, with ±(30 ppm + 3% of reading) accuracy across the 400-5000 ppm range. Since CO2 is one of the clearest signs of stuffy air and poor ventilation - the kind that makes a room feel drowsy and unfocused. This sensor fits well at the center of an air-quality monitor, smart-ventilation controller, or classroom or office display. It communicates over I2C through two Qwiic connectors, so you can plug it into your NULA board and start reading. There is also a 4-pin header for soldered wiring, plus on-board 10 kΩ pull-ups that can be removed with a solder jumper. The SCD43 also measures temperature and humidity with its built-in sensor, and it keeps its readings accurate over time with automatic self-calibration (ASC) and optional forced recalibration (FRC), with essentially no maintenance. For battery-powered projects, it has a low-power periodic mode and an on-demand single-shot mode to reduce current between readings.