Example Code for Raspberry Pi - Read VOC Index

Hardware Preparation

• Raspberry Pi B4(or similar) x 1
• SGP40 Air Quality Sensor x1
• Jumper wires

Software Preparation

• SGP40 Air Quality Sensor Python Library
• RASPBIAN Raspberry Pi Official OS

Wiring Diagram

Other Preparation Work

Step 1. Enable Raspberry Pi I2C. Skip this step if it is already enabled. Open the terminal, input the following commands:

pi@raspberrypi:~ $ sudo raspi-config

Select "5 Interfacing Options" with the up/down arrows, press "enter", then select "P5 I2C", click "YES". Restart the Raspberry Pi board.

Step 2. Install Python Dependent Library and git(Your Raspberry Pi board needs to access to the Internet). Skip this step if they have been installed already. Input the following commands into the terminal:

pi@raspberrypi:~ $ sudo apt-get update
pi@raspberrypi:~ $ sudo apt-get install build-essential python-dev python-smbus git

Step 3. Download SGP40 Driver library. Input the following commands into the terminal:

pi@raspberrypi:~ $ cd Desktop/ pi@raspberrypi:~/Desktop $ git clone https://github.com/DFRobot/DFRobot_SGP40

Sample Code

Connect the sensor with your Raspberry Pi board as the diagram shown above. I2C default address: 0x59.

Input the following commands into the terminal and run the codes:

pi@raspberrypi:~/Desktop $ cd /home/pi/Desktop/DFRobot_SGP40/Python/raspberrypi/examples/
pi@raspberrypi:~/Desktop/DFRobot_SGP40/Python/raspberrypi/examples $ python get_voc_index.py

Result

Print the VOC index once every 1 second.