When developing the book, I didn't have any additional meters or sensors to cross reference measurements with so I can't comment on the accuracy unfortunately. But I did notice that the changes in measurements made sense when the environment changed. I.e when I would exhale on the sensor, the measurement would rise and fall.
To clarify, the OP said: "I have neither time nor workshop space to solder and assemble anything more trivial than "plug a sensor into an ESP32 and screw both into a box"."
The book is very much "plug in a sensor" style as everything is connected via Qwiic cables.
Hey there! My co-authors and I actually wrote a book on this topic earlier this year. It walks you though setting up a weather station with Elixir and Nerves using a Raspberry Pi and the following sensors:
After you set up the hardware side of things, you put together a very simple Elixir Phoenix REST API and persist the sensor data into Postgres (with the TimescaleDB extension).
And to wrap up the book, you learn how to create Grafana dashboards to visualize all your time-series data.
Everything is meant to be set up on your LAN and everything can be run either natively or in Docker (there is a Docker compose file in the repo).
Really appreciate the kind words and happy to hear that you are enjoying the book! Hugo Baraúna and I have really enjoyed putting this book together and feel that Livebook has become pivotal in explaining certain topics and really understanding how things work under the hood. I wrote a blog post about some of my thoughts around Livebook as a learning tool on the DashBit blog: https://dashbit.co/blog/livebook-as-an-educational-tool
I have been using LiveView for over a year now in production applications, and I must say...it has been a breath of fresh air when developing web applications. The amount of product that you can deliver per unit time is unmatchable (in my opinion of course). The ceiling for what you can accomplish with a single tech stack (Elixir in this case) has definitely been lifted considerably.
Demo applications such as this show exactly what is possible in this tech stack and should make you question whether you need to make that leap to an SPA. At some point you will possibly need to lean on an SPA tool like Vue or React, but I think that point is now further away with tools like LiveView (Elixir), Hotwire (Ruby), and Livewire (PHP).
Another example was when I opened my window in my office. CO2 immediately dropped off (15:42 timestamp): https://twitter.com/akoutmos/status/1443233937015418891/phot...