Module Supplier information
The SCD41 can measure CO2 concentrations in the range from 400 to 5000 ppm. In addition to measuring CO2, the SCD41 can also measure temperature and humidity. The sensor communicates through an I²C bus and can be powered from 2.4V up to 5.5V. You can connect it to ESP32, ESP8266, Arduino Uno or Raspberry Pi. You can connect the module via a pin comb or JST-SH connector. The module itself also has its own pull-up resistors for the I²C bus.
Specifications:
- Power supply: 2.4-5.5V
- Measurement range: 400 - 5000ppm
- Accuracy: ± (40 ppm + 5%) of the measured value
- Bus: I2C
- Range (temperature): -10 - +60 ° C
- Accuracy (temperature): ± 0.8 ° C (for range 15 - 35 ° C)
- Range (humidity): 0 - 100% RH
- Accuracy (humidity): ± 6% RH (15 ° C - 35 ° C, 20% RH - 65% RH)
- Dimensions: 21x21x8mm
- Weight: 2.5g
Sensirion SCD41
| Subject | Specification |
|---|---|
| Method | Non Dispersive Infrared (NDIR), built-in SHT4x humidity and temperature sensor for signal compensation. |
| Measurement Range | 400 to 5000 ppm |
| Accuracy | 400-2000 ± 50 ppm, 2001-5000 ± 40 ppm |
| Typical Response Time | CO2 60s, humidity 90s, temperature 120s |
| Signal Update in periodic measurement mode | Every 5 seconds |
| Signal Update in low power periodic measurement mode | Every 30 seconds |
| Storage Conditions | 10°C to 50°C |
| Power Supply Requirements | 2.4-5.5 VDC, typical 3.3V or 5.0V |
| Power Supply | Peak 205mA @ 3.3V, 137mA @ 5.0V (175mA, 115mA typical) |
| Average supply currrent for low power periodic measurement mode, 1 measurement every 30 seconds | 3.5mA @ 3.3V, 3mA @ 5.0V (3.2mA, 2.8mA typical) |
| Sensor lifetime | > 10 years |
Available models
| Part Number | Description | Measurement Range |
|---|---|---|
| SCD40 | Base accuracy | 400-2000 ppm |
| SCD41 | High accuracy, low power modes supported, single shot measurement | 400-5000 ppm |
Documents
- Sensirion data sheet SCD4x pdf
Pin Designations
| Connector Pin-out | Function | Description |
|---|---|---|
| 1 | GND | Ground |
| 2 | VDD | Supply voltage |
| 3 | SCL | I2C Serial clock |
| 4 | SDA | I2C Serial data, bidirectional |
Programming
Arduino library: https://github.com/Sensirion/arduino-i2c-scd4x
Alternative Arduino library: https://github.com/sparkfun/SparkFun_SCD4x_Arduino_Library
Tasmota support: https://tasmota.github.io/docs/SCD4x/#device-information
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