Esp8266

Sometime early last year I replaced my SmartThings home automation hub with a Home Assistant VM running on an Intel NUC.

Not long after that I converted my Envirosense boards (see previous post) to run the ESPHome firmware and started scraping Prometheus metrics from Home Assistant.

There was one thing I wasn’t happy about with my original design. The PIR sensor was frequently showing false positive motion events.
This seems to have gotten worse with the switch to the ESPHome firmware. It appears to be a known issue that these HC-SR501 modules are easily triggered by Wifi interference.

Over the last few years I’ve spent a considerable amount of time working with the Prometheus monitoring system and time series database in combination with the Grafana visualization platform.
I had been wanting to track the temperature and humidity of a few rooms and was looking for an excuse to run a Prometheus server at home. I thought it would be neat to use a Wi-Fi microcontroller to collect this sensor data and expose it directly in the Prometheus simple text-based exposition format.