diff --git a/content/Sensors.md b/content/Sensors.md index 34925dc..c3cdccb 100644 --- a/content/Sensors.md +++ b/content/Sensors.md @@ -1,17 +1,63 @@ Title: Sensors Date: 2022-05-24 Category: Notes -Summary: A dashboard for various sensors around my house. +Summary: Graphs of various sensors around my house. Short: d -I wrote a custom [dashboard](https://sensors.dns.t0.vc/) to visualize data from various sensors around my house. I'm a huge fan of sensors because they're at the intersection of what I love: electronics, home automation, and data hoarding. +## Graphs + +These graphs are live and updated once per minute, assuming the script works: + +![a graph](https://sensor-pics.dns.t0.vc/Solar_Power.png) + +Black: power (W), green: energy (kWh) + +![a graph](https://sensor-pics.dns.t0.vc/Living_Room_Air.png) + +Black: PM10 (ug/m³), red: PM2.5 (ug/m³), blue: CO₂ (ppm), green: VOC / 500 + +![a graph](https://sensor-pics.dns.t0.vc/Outside_Temperature.png) + +Black: temperature (°C) + +![a graph](https://sensor-pics.dns.t0.vc/Bedroom_Temperature.png) + +Black: temperature (°C), green: humidity (%) + +![a graph](https://sensor-pics.dns.t0.vc/Nook_Temperature.png) + +Black: temperature (°C), green: humidity (%) + +![a graph](https://sensor-pics.dns.t0.vc/Misc_Temperature.png) + +Black: temperature (°C), green: humidity (%) + +![a graph](https://sensor-pics.dns.t0.vc/Nook_Thermostat.png) + +Black: temperature (°C), red: setpoint (°C), green: state (off / heating / cooling) + +![a graph](https://sensor-pics.dns.t0.vc/Gas_Usage.png) + +Black: total (MJ), green: delta (MJ) + +![a graph](https://sensor-pics.dns.t0.vc/Water_Usage.png) + +Black: total (L), green: delta (L) + +![a graph](https://sensor-pics.dns.t0.vc/Living_Room_Lux.png) + +Black: light (lx) + +## Live Dashboard + +A live interactive version can be found on this [dashboard](https://sensors.dns.t0.vc/). You can find the [source code](https://git.tannercollin.com/tanner/sensors) on my Gitea. -![[sensors1.png]] +## Data Capture Most of the data is captured by two cheap RTL-SDRs (software-defined radios) that are set to listen to 433 MHz and 915 MHz radio frequencies. I use the open-source project [rtl_433](https://github.com/merbanan/rtl_433) to automatically decode the signals and forward them to an MQTT broker, which is a messaging server that services can publish and subscribe to. Other sensors run an MQTT client directly or expose their data through other means like a web interface that I poll. The data gets collected by a central Python script that process and stores it in an InfluxDB database for "efficient" storage. The script also runs a web server that queries the database and exposes the data over an API to the dashboard at various dates and ranges. The dashboard is written in JavaScript / React using a simple chart library. -My biggest regret was using InfluxDB. It's a stupid database and I wouldn't recommend it to anyone. The documentation is confusing and I ran into timezone issues with `group by time()`. It also assumes the column data type is an integer if your sensor happens to send it a whole number at first and it won't let you change that. Just stick to Postgres / SQLite. \ No newline at end of file +My biggest regret was using InfluxDB. It's a stupid database and I wouldn't recommend it to anyone. The documentation is confusing and I ran into timezone issues with `group by time()`. It also assumes the column data type is an integer if your sensor happens to send it a whole number at first and it won't let you change that. Just stick to Postgres / SQLite.