These are my notes to build a MQTT based IOT mesh network based application. The code is based on Python with the microcontrollers using Micropython.
The overall data is captured into a centralized database -- i chose mysql running local. Analytics and dashboard capabilities leveraging pandas, plotly, and dash
Sensor support mostly based on i2C bus.
BME280 -- Barometric Pressure, Temperature, and Humidity
HC-SR501 -- PIR Motion Sensor
NRG #40C -- Annometer -- customized circut