Resources:

SCD43 Datasheet

Sensirion I2C SCD4x Arduino Library
DXF Files
STEP Files

7Semi SCD43 High-Accuracy CO2, Temperature and Humidity Sensor Breakout with I2C and Qwiic
The 7Semi SCD43 CO2, Temperature and Humidity Sensor Breakout is designed for indoor air-quality monitoring, ventilation control, smart-building systems, and connected environmental sensing. It uses the Sensirion SCD43, which combines PASens photoacoustic NDIR CO2 measurement with integrated temperature and relative-humidity sensing. The sensor provides a CO2 output range of 040,000ppm, with specified CO measurement accuracy of +-(30ppm + 3% of reading) across the 4005,000ppm specified measurement range.
The breakout communicates over I2C at the fixed 7-bit address 0x62 and supports automatic self-calibration (ASC), forced recalibration (FRC), periodic measurement, and single-shot measurement modes. The board accepts 3.65.5V through VCC and provides Qwiic connectivity for convenient integration with compatible controllers. When powered through VCC, the 3V3 pin provides a regulated 3.3V output rated up to 200mA; alternatively, the board can be powered directly through 3V3. VCC and 3V3 must not be powered simultaneously.
Key Features

Three Environmental Measurements: Measures CO concentration, temperature, and relative humidity
True CO Measurement: Uses Sensirion PASens photoacoustic NDIR technology
Wide CO Output Range: Provides CO output from 040,000ppm
Specified CO Range: Accuracy specified from 4005,000ppm
High CO Accuracy: +-(30ppm + 3% of measured value) from 4005,000ppm
IC Interface: Digital communication using fixed 7-bit address 0x62
Qwiic Connectivity: Supports convenient plug-in I2C integration
Automatic Self-Calibration: ASC helps maintain long-term CO2 measurement accuracy under suitable operating conditions
Forced Recalibration: FRC allows recalibration against a known CO2 reference
Single-Shot Measurement: Supports on-demand measurements for reduced average power consumption
Integrated Temperature Sensor: Typical +-0.8C accuracy from 15C to 35C
Integrated Humidity Sensor: Typical +-6%RH accuracy under specified conditions
Wide VCC Range: Supports 3.65.5V board supply through VCC
Regulated 3.3V Output: 3V3 pin provides up to 200mA when powered through VCC
Compact Breakout: 30 22 7.83mm board dimensions

Applications

Indoor air-quality monitors
HVAC ventilation control
Smart buildings
Demand-controlled ventilation
Home automation
IoT environmental monitoring
Office and classroom CO2 monitoring
Building-management systems
Air-quality data loggers
Environmental instrumentation
Embedded sensing systems

SCDX CO2 Measurement SensorPinout Reference Guide

Calibration Certificate
A calibration certificate is available for the sensor. To request the certificate, please email us the sensor serial number, and we will share the corresponding calibration certificate.
Package Includes:

1x7Semi SCD43 Breakout Board (ES-12295)
1xPin Header