Albeit a simple hobby project in the beginning, the design has proven flexible enough & the implementation stable enough to enable the addition of many bits & bobs over the years, accidently creating an end-to-end platform of sorts. The aim here is to capture all those bits in one place & discuss them more thoroughly.
The primary "data bus" is redis pub/sub while implementation languages vary depending on the platform & requirements. Both Raspberry Pi and Arduino devices feature significantly, and in the fully-deployed system under discussion rely on the Bosch BME680 for temperature/humidity/pressure sensing & the Sensirion SPS30 for particulate matter (air quality) sensing.
Arranged roughly in order of where each appears in the pipeline, from sources to sinks. Maturity varies widely.
A sensor management & data collection/emission suite for Raspberry Pi devices written in Python 2.7 that acts as the primary data source for the platform.
Yet Another Redis Library, this one in POSIX-compliant C.
Arduino live data display devices that inspired the creation of & consume Arduino-Redis (below).
A Redis client library for Arduino devices written in C++11.
A rudimentary Redis-to-HTTP proxy, written in Go, that enables the Weather Dashboard (below).
Plotly). Features user-configurable plots with both historic and live data.
Air-quality index dashboard
Enabled by ThinkSpeak and the powerful MatLab integration within, this dashboard
features a live air-quality index value based on data from the pipeline, as defined by the US EPA. The MatLab source is available