A Do It Yourself zen Indoor Air Quality monitor

#DIYzenIAQ is a DIY Carbon Dioxide (CO2) and Volatile Organic Compounds (VOC) meter, an accurate indoor air quality monitor that helps to focus on breathing.

The idea is to encourage to live in healthy environments, and as soon as possible, stop, relax and focus on breathing.

Learn more about #DIYzenIAQ

Measurement values

• Date and time
• Temperature
• Humidity
• Apparent temperature (Heat Index)
• eCO2
• TVOC
• VOC IAQ (% Indoor Air Quality)
• Total index (comfort and pollutants for zen mode)

Components

• Raspberry Pi 1 Model A+
• Pimoroni HAT Hacker HAT
• Pimoroni Unicorn HAT Mini
• Pimoroni Breakout Garden Mini (I2C)
• Pimoroni BME680 Breakout / Pimoroni BME688 4-in-1 Air Quality Breakout
• Pimoroni SGP30 Air Quality Sensor Breakout
• Pimoroni RV3028 Real-Time Clock
• 3 Totem L-twisted bracket
• 3 Totem L-twisted mirror bracket
• 2 Totem Plastic boards 30 x 100 mm
• Flat copper heatsink and modified Suptronics Cooling Fan Expansion Board X728-A1
• GPIO Booster Header
• Nylon nut, bolt and spacer M2.5 / M3
• Right angle microUSB cable

Dependencies & installation

• Raspberry Pi OS Buster
• Python 3.7 or later

sudo apt-get install python3-pip
sudo pip3 install setuptools
sudo pip3 install smbus
sudo pip3 install smbus2
sudo pip3 install unicornhatmini
sudo pip3 install bme680
sudo pip3 install pimoroni-sgp30
sudo pip3 install rv3028

Use & button commands

sudo python3 diyzeniaq.py

After 6 minutes of sensors burn-in (in a healthy environment, previously ventilated) it is possible to interact with the buttons:

• A: LEDs ON and scroll UP the list of values
• B: LEDs ON and scroll DOWN the list of values
• X: LEDs OFF
• Y: safe shutdown

References

• Bosch Sensortec BME680 / BME688 has been developed to detect exhaled human breath. It measures the concentration of Volatile Organic Compounds (VOCs) and outputs an index of air quality (IAQ).
• Sensirion SGP30 is a gas sensor that can detect a wide range of Volatile Organic Compounds (VOCs) and an equivalent carbon dioxide (CO2eq)
• Micro Crystal RV-3028 is an extreme low power and highly accurate real-time clock / calendar module.
• Air quality, COVID-19 and sensing solutions
• Correct ventilation helps to prevent virus transmission