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|GNU General Public License v3.0 only||MIT License|
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Monitoring my home's air quality with AirGradient's DIY sensor
1 project | news.ycombinator.com | 8 Sep 2021
Not sure if this is DIY enough for you, but I'm using an MQ131 (about $20-$30 on Amazon, probably cheaper directly from China) in an air quality sensor I'm building. There's an Arduino library for it , and from what I can tell so far, it does work, though it's probably not super accurate. It's also somewhat sensitive to environmental factors, though you can correct for some of that with known temperature/humidity.
What are some alternatives?
InfluxDB - Scalable datastore for metrics, events, and real-time analytics
Grafana - The open and composable observability and data visualization platform. Visualize metrics, logs, and traces from multiple sources like Prometheus, Loki, Elasticsearch, InfluxDB, Postgres and many more.
Adafruit_Sensor - Common sensor library
infidel-sensor - Firmware, mechanical and electrical design files for the Inline Filament Diameter Estimator, Lowcost (InFiDEL).
ModuleInterface - Easy config and value sync between IoT modules, database and web pages
pcd8544 - Minimal footprint library for Philips PCD8544 LCDs on the Arduino.