Add air quality monitor article

content/.obsidian/workspace.json

@@ -55,12 +55,12 @@
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+    "Sensors.md",
+    "Custom Air Quality Monitor.md",
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content/Custom Air Quality Monitor.md

@@ -0,0 +1,30 @@
+Title: Custom Air Quality Monitor
+Date: 2025-01-13
+Category: Creations
+Summary: An air quality monitor made from sensor modules.
+Image: airmonitor1.jpg
+xTags: feed
+
+I made custom air quality monitors to track the air in my kitchen, living room, and bedroom. They use sensor modules that detect PM2.5, PM10, CO<sub>2</sub>, VOCs, Light level, pressure, temperature and humidity. The data is sent to my [[Sensors]] database once per minute.
+
+![[airmonitor1.jpg]]
+
+The modules connect to an ESP8266 Arduino over I<sup>2</sup>C and UART serial. They are mounted on press-fit pegs to a 3D printed base plate I designed in FreeCAD.
+
+The sensors used are:
+
+- [HPMA115S0](https://www.digikey.ca/en/products/detail/honeywell-sensing-and-productivity-solutions/HPMA115S0-XXX/7202204) - Particulate Sensor
+- [Adafruit SCD-30](https://www.adafruit.com/product/4867) - NDIR CO2 Temperature and Humidity Sensor
+- [Adafruit BH1750](https://www.adafruit.com/product/4681) - Light Sensor
+- [Adafruit SGP40](https://www.adafruit.com/product/4829) - VOC Sensor
+- [Adafruit LPS22](https://www.adafruit.com/product/4633) - Pressure Sensor
+
+The light data is used by my home automation system to know when it's night time so that motion sensors turn lights on. I also learned that the CO<sub>2</sub> level in my bedroom was doubling from 650 ppm to 1251 ppm overnight while I slept. This is bad since [high CO<sub>2</sub> concentration affects sleep](https://www.sciencedirect.com/science/article/pii/S0360132323011459), so now my automation system turns the furnace blower on while I sleep.
+
+Before running the blower automatically (24 hour graph, CO<sub>2</sub> is the blue line):
+
+![[airmonitor2.png]]
+
+After:
+
+![[airmonitor3.png]]