Sensirion SCD40 - CO2 level, humidity and temperature sensor

This sensor builds on the photo-acoustic sensing principle.

Sensor board is equipped with an I2C interface.

Usage with Lan Controller

Sensor support is available in HW 3.5+ and SW 1.50+.

When connecting via the I2C interface, select the option with this sensor on the I2C and 1Wire sensors page. As a result, the readings from the sensor will be available in the fields T1, H1, CO2.

Technical specifications

Supply voltage	2.4-5.5V DC (typically 3.3V or 5V)
Peak supply current	175mA
Length of connecting cable (maximum)	0.5m (I2C)
Measurement range	0-40000ppm (CO2) 0-100% RH (humidity) -10 to +60 °C (temperature)
Measurement accuracy	+/- 50ppm + 5% (CO2, in the range of 400-2000ppm) +/- 6% RH (humidity, in the range of 15 to 35 °C and 20-65% RH) +/- 9% RH (humidity, in the range of -10 to 60 °C and 0-100% RH) +/- 0.8 °C (temperature, in the range of 15 to 35 °C) +/- 1.5 °C (temperature, in the range of -10 to 60 °C)
Measurement repeatability	+/- 10ppm (CO2) +/- 0.4% RH (humidity) +/- 0.1 °C (temperature)
Response time	60s (CO2) 90s (humidity) 120s (temperature)