Grove - CO2 & Temperature & Humidity Sensor (SCD41)

The Grove - CO2 & Temperature & Humidity Sensor - SCD41 is a small but powerful module which made by Sensirion. It is a multiple function sensor which can measure temperature, pressure, humidity and CO2 at the same time. It is based on the SCD41 module and you can use this sensor in your GPS, IoT devices or other device which needs those four parameters.

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Features

• 3-in-1 for multiple measurement
• low power consumption
• Wide measurement range
• I2C Interface
• Wide power supply range

Specification

Item	Value
Working voltage	2.4V~5V
Operating range	-10~+60℃; 0-100% r.H.; 0-40,000ppm
I2C Address	0x62

Hardware Overview

Pin Map

Platforms Supported

Arduino	Raspberry Pi

caution

The platforms mentioned above as supported is/are an indication of the module's software or theoritical compatibility. We only provide software library or code examples for Arduino platform in most cases. It is not possible to provide software library / demo code for all possible MCU platforms. Hence, users have to write their own software library.

Getting Started

Play With Arduino

Hardware

Materials required

Seeeduino V4.2	Base Shield	CO2 & Temperature & Humidity Sensor - SCD41
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note

1 Please plug the USB cable gently, otherwise you may damage the port. Please use the USB cable with 4 wires inside, the 2 wires cable can't transfer data. If you are not sure about the wire you have, you can click here to buy

2 Each Grove module comes with a Grove cable when you buy. In case you lose the Grove cable, you can click here to buy.

• Step 1. Connect the Grove-Temperature&Humidity&Pressure&Gas Sensor(BME680) to port I2C of Grove-Base Shield.

• Step 2. Plug Grove - Base Shield into Seeeduino.

• Step 3. Connect Seeeduino to PC via a USB cable.

note

If we don't have Grove Base Shield, We also can directly connect this module to Seeeduino as below.

Seeeduino	Grove-BME680
5V	Red
GND	Black
SDA	White
SCL	Yellow

Software

note

If this is the first time you work with Arduino, we strongly recommend you to see Getting Started with Arduino before the start.

• Step 1. Download the arduino-i2c-scd4x library and arduino-core dependency from Github.

• Step 2. Refer to How to install library to install library for Arduino.

• Step 3. Restart the Arduino IDE. Open Sensirion I2c SCD4x example via the path: File --> Examples --> Sensirion I2c SCD4x --> exampleUsage.

• Step 4. Upload the demo. If you do not know how to upload the code, please check How to upload code.

• Step 5. Open the Serial Monitor of Arduino IDE by click Tool-> Serial Monitor. Or tap the ++ctrl+shift+m++ key at the same time. if every thing goes well, you will get the result.

The result should be like:

Serial: 0x6A565F073B88
Waiting for first measurement... (5 sec)
Co2:868 Temperature:33.08 Humidity:49.40
Co2:845 Temperature:32.72 Humidity:50.13
Co2:852 Temperature:32.28 Humidity:51.54

bug

• To get the stable and accurate value, you need to let the arduino run the code for about 2 hours. The result is much more reliable then.

Play on RaspberryPi

Materials required

Raspberry pi	Grove Base Hat for Raspberry Pi	Grove - OLED Display 1.12" V3.0
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Get ready for RaspberryPi

I2C Connection

• Step 1. Plug Grove - CO2 & Temperature & Humidity Sensor - SCD41 to I2C port of Grove - Base Hat.

• Step 2. Plug Grove - Base Hat into RaspberryPi.

• Step 3. Connect RaspberryPi to a PC via Serial or SSH.

Software

• Step 1. Enable I2C on RaspberryPi

sudo apt-get install -y i2c-tools
sudo raspi-config

Follow the pictures to enable I2C and SPI on your RaspberryPi.

And then reboot your RaspberryPi

sudo reboot

• Step 2. Install necessary libraries

sudo apt-get install wget gcc make unzip -y

Install WiringPi Library

If you use WiringPi, you need to update WiringPi to version 2.52. This library may not be updated. Other libraries are recommended

cd
sudo apt-get install wiringpi
wget https://project-downloads.drogon.net/wiringpi-latest.deb
sudo dpkg -i wiringpi-latest.deb
gpio -v

Install bcm2835

cd
wget http://www.airspayce.com/mikem/bcm2835/bcm2835-1.60.tar.gz
tar zxvf bcm2835-1.60.tar.gz 
cd bcm2835-1.60/
sudo ./configure
sudo make && sudo make check && sudo make install

For further information and the newest libraries please refer to website：bcm2835

• Step 3. Download the driver from the Sensirion GitHub Page and extract the .zip on your Raspberry Pi

• Step 4. Compile the driver

1.Open a terminal

2.Navigate to the driver directory. E.g. cd ~/raspberry-pi-i2c-scd4x

3.Run the make command to compile the driver

Output:

rm -f scd4x_i2c_example_usage
cc -Os -Wall -fstrict-aliasing -Wstrict-aliasing=1 -Wsign-conversion -fPIC -I. -o scd4x_i2c_example_usage  scd4x_i2c.h scd4x_i2c.c sensirion_i2c_hal.h sensirion_i2c.h sensirion_i2c.c \
sensirion_i2c_hal.c sensirion_config.h sensirion_common.h sensirion_common.c scd4x_i2c_example_usage.c

• Step 5. Test your connected sensor

Run ./scd4x_i2c_example_usage in the same directory you used to compile the driver.

Output:

serial: 0xbff79f073b51
CO2: 799
Temperature: 20.92
Humidity: 35.95
CO2: 900
Temperature: 20.92
Humidity: 36.47
CO2: 926
Temperature: 20.81
Humidity: 36.85
...

For further infomation, please check Sensirion/raspberry-pi-i2c-scd4x on GitHub.

Schematic Online Viewer

Resources

• [PDF] Sensirion CO2 Sensors SCD4x Datasheet
• [STEP] STEP of Sensirion CO2 Sensors SCD4x
• [ZIP] Grove - CO2 & Temperature & Humidity Sensor - SCD41 Board File

Tech Support & Product Discussion

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