Sensirion SEN66-SIN-T Environmental Sensor Module | 0 to 40000 ppm CO₂ | I2C Interface

The SEN66-SIN-T module requires a 3.3V DC supply. It is critical to adhere to this voltage rating, as exceeding it may damage the internal NDIR sensor and digital circuitry. Ensure your host system or regulator can provide a stable 3.3V source.

The module communicates via a standard digital I2C interface. Connect the SDA and SCL pins to your microcontroller (e.g., Arduino, ESP32, Raspberry Pi) with appropriate pull-up resistors. You can use Sensirion's official library or datasheet commands to read the calibrated CO₂ concentration values directly.

While robust, the SEN66-SIN-T is a module designed for integration into protected enclosures. For harsh outdoor or industrial settings, it must be housed within an IP-rated enclosure that protects it from direct water ingress, dust, and extreme physical shock while allowing for adequate air sampling.

The SEN66-SIN-T module is factory calibrated, providing accurate readings out of the box without user calibration. For long-term deployments exceeding several years, periodic verification against a known reference may be recommended to maintain optimal accuracy, as per Sensirion's guidelines.