diff --git a/content/.obsidian/workspace.json b/content/.obsidian/workspace.json
index a9db2ca..e3b93d3 100644
--- a/content/.obsidian/workspace.json
+++ b/content/.obsidian/workspace.json
@@ -55,12 +55,12 @@
             "state": {
               "type": "markdown",
               "state": {
-                "file": "QotNews.md",
+                "file": "Custom Air Quality Monitor.md",
                 "mode": "source",
                 "source": false
               },
               "icon": "lucide-file",
-              "title": "QotNews"
+              "title": "Custom Air Quality Monitor"
             }
           },
           {
@@ -165,7 +165,7 @@
             "state": {
               "type": "backlink",
               "state": {
-                "file": "QotNews.md",
+                "file": "Custom Air Quality Monitor.md",
                 "collapseAll": false,
                 "extraContext": false,
                 "sortOrder": "alphabetical",
@@ -175,7 +175,7 @@
                 "unlinkedCollapsed": true
               },
               "icon": "links-coming-in",
-              "title": "Backlinks for QotNews"
+              "title": "Backlinks for Custom Air Quality Monitor"
             }
           },
           {
@@ -184,13 +184,13 @@
             "state": {
               "type": "outline",
               "state": {
-                "file": "QotNews.md",
+                "file": "Custom Air Quality Monitor.md",
                 "followCursor": false,
                 "showSearch": false,
                 "searchQuery": ""
               },
               "icon": "lucide-list",
-              "title": "Outline of QotNews"
+              "title": "Outline of Custom Air Quality Monitor"
             }
           }
         ],
@@ -213,20 +213,26 @@
   },
   "active": "24a62ccdfd18a884",
   "lastOpenFiles": [
+    "media/airmonitor3.png",
+    "media/airmonitor2.png",
+    "media/Pasted image 20250622165324.png",
+    "media/airmonitor2.png",
+    "media/airmonitor1.jpg",
+    "Sensors.md",
+    "Custom Air Quality Monitor.md",
+    "Protovac Retro Terminal.md",
+    "QotNews.md",
     "Notica.md",
     "Spaceport.md",
     "media/spaceport1.png",
     "Garage Door Opener.md",
     "media/protovac1.jpg",
-    "Protovac Retro Terminal.md",
-    "QotNews.md",
     "Fake Dog.md",
     "Bypassing Ports.md",
     "Backup Strategy.md",
     "Algae Growth.md",
     "t0 Services.md",
     "Solar Car.md",
-    "Sensors.md",
     "Protospace.md",
     "Helios Alpha.md",
     "Hand of Ozymandias.md",
@@ -235,7 +241,6 @@
     "media/fake-dog.jpg",
     "media/dress1.jpg",
     "media/cookies2.jpg",
-    "media/cookies1.jpg",
     "Acoustic Panels.md",
     "About.md",
     "Hydroponics Log 3.md",
@@ -243,11 +248,6 @@
     "Hydroponics Log 1.md",
     "pages/writing.md",
     "pages/projects.md",
-    "pages/creations.md",
-    "Makerspace Tours.md",
-    "Secret Garden.md",
-    "media/nft2.jpg",
-    "media/nft1.png",
-    "media/ports1.svg"
+    "pages/creations.md"
   ]
 }
\ No newline at end of file
diff --git a/content/Custom Air Quality Monitor.md b/content/Custom Air Quality Monitor.md
new file mode 100644
index 0000000..cb51837
--- /dev/null
+++ b/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]]
\ No newline at end of file
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