IAQ (Indoor Air Quality) Board¶
IAQ Board is a DIY device for measuring internal air quality running with esphome. It’s quite small and is based on a custom PCB where part of the components are soldered and connected.
Here is what it can measure:
Temperature / Humidity / Pressure
Air particles PM1, PM2.5, PM10
Carbon Dioxide with NDIR sensor
Air Quality Index by EPA, based on 24h average PM2.5 particles
Total VOC (volatile organic compound)
equivalent CO2 (not very correct compared with the NDIR sensor, but it’s provided by the VOC sensor)
On top of that:
At least one OLED display to show the data (can have one more on the top of the MCU board)
three RGB wide angle LEDs with auto brightness. LED1 indicates PM2.5, LED2 - Air quality index, LED3 - CO2.
auto night dimming of the displays and LEDs (can be disabled)
MIN/MAX values of Temperature, PM2.5 and CO2, and 24h average PM2.5 value.
multi function button for selection of the data to show on the display
Full documentation (PCB, Schematic, esphome yaml config) is published here: https://github.com/nkitanov/iaq_board
YAML configuration is about 700 lines and can be downloaded from here: iaq_board.yaml
SGP40 Volatile Organic Compound Sensor and SGP41 VOC and NOx Sensor