5 ms·

I have one "built" in my house right now. I say "built" as I have simply bungie-tied an air filter to a box fan. I have also hooked it up to one of those analog

I have one "built" in my house right now. I say "built" as I have simply bungie-tied an air filter to a box fan. I have also hooked it up to one of those analog outlet timers so it's not running the whole day. I'm sure folks on HN could do a much better and more interesting job: - Rasberry Pi Zero runs PM2.5 sensor. - Fan is controlled by Raspberry Pi Zero. - Fan only turns on when PM2.5 levels are over threshold for n seconds. - Fan only turns off when PM2.5 levels are below threshold for n seconds. - Add some collection and graphing of PM2.5 levels over time for fun.

dfinninger 5y ago
What PM2.5 Sensor are you using? I'm about to start a build to monitor indoor AQI/CO2.
- everdrive 5y ago
  So currently I'm not using any. (the list above is what I am NOT doing) Previously, I had sensor from this family hooked up to a Raspberry pi doing measurement only: https://www.amazon.com/AITRIP-Precision-Quality-Detection-Compatible/dp/B08QRJSVW7/ https://www.amazon.com/AITRIP-Precision-Quality-Detection-Co...
  - dfinninger 5y ago
    Oh, ha! So much for my reading comprehension. Thanks for the link. I think that should be compatible with a Pi. I can try it out in a couple weeks when I get some free time to tinker.
- thamer 5y ago
  I have a PM2.5 sensor hooked to a Raspberry Pi Zero W, I use the PMS5003 ($40 at Adafruit). I have a script running in a screen session that posts its measurements once a minute to a Google Cloud Function which then inserts it into BigQuery, and then a DataStudio dashboard to visualize the data. The cloud cost is $0, it all falls in the free tier. The Raspberry Pi Zero W is just $10. I have a separate station with an SCD-41 CO2 sensor (+ temp/humidity/pressure with an MCP9808) all hooked up to a TinyPico board with Stemma QT that also post metrics to BigQuery in a similar way. And yes I'm planning to combine both into a single device very soon :-)

dfinninger 5y ago

What PM2.5 Sensor are you using? I'm about to start a build to monitor indoor AQI/CO2.

everdrive 5y ago
So currently I'm not using any. (the list above is what I am NOT doing) Previously, I had sensor from this family hooked up to a Raspberry pi doing measurement only: https://www.amazon.com/AITRIP-Precision-Quality-Detection-Compatible/dp/B08QRJSVW7/ https://www.amazon.com/AITRIP-Precision-Quality-Detection-Co...
- dfinninger 5y ago
  Oh, ha! So much for my reading comprehension. Thanks for the link. I think that should be compatible with a Pi. I can try it out in a couple weeks when I get some free time to tinker.
thamer 5y ago
I have a PM2.5 sensor hooked to a Raspberry Pi Zero W, I use the PMS5003 ($40 at Adafruit). I have a script running in a screen session that posts its measurements once a minute to a Google Cloud Function which then inserts it into BigQuery, and then a DataStudio dashboard to visualize the data. The cloud cost is $0, it all falls in the free tier. The Raspberry Pi Zero W is just $10. I have a separate station with an SCD-41 CO2 sensor (+ temp/humidity/pressure with an MCP9808) all hooked up to a TinyPico board with Stemma QT that also post metrics to BigQuery in a similar way. And yes I'm planning to combine both into a single device very soon :-)