Various automation-related IoT projects using Rust that communicate primarily via MQTT.
Doorsys is a door access control system with centralized management and logging.
Doorsys was born out of frustration with consumer-grade smart locks. I needed something more reliable with centralized logs, multiple access codes and badges, and more importantly, remote management. After surveying the landscape, I came to the realization that the options weren't great. Either you settle for a subpar solution using one of the existing smart locks + app available on the marketplace, or you have to spend an arm and a leg and step up to a more professional solution. I did neither. I did what every engineer would do: roll my own solution! How difficult can it be, right? Famous last words :)
Jokes aside, I took it as a challenge. After some research, I figured the hardware necessary was readily available online, and an ESP32 microcontroller would be more than enough to run the firmware. I started the development of the firmware using C and the official ESP-IDF library but later on switched to the experimental yet highly capable rust based ESP-RS implementation.
- doorsys-hardware: in depth hardware breakdown, schematics, and PCB design.
- doorsys-firmware: ESP32-C3 compatible firmware for controlling the hardware and communication with the backend.
- doorsys-protocol: Defines the messages supported by the platform.
- doorsys-api: Rest API for the admin interface and also handler for the MQTT messages.
- doorsys-web: Web interface for the admin console.
The firmware will constantly report heap and flash usage using MQTT messages using the InfluxDB line protocol format. Telegraf is used to consume these messages and write them to the InfluxDB instance, while a Grafana dashboard has been set up for visualization.
The firmware is meant to be flashed straight onto the device. Check the repository for details. Over-the-air updates are not supported at this time. Container images are provided for the API and WEB components, which can then be deployed using Docker or Podman. Personally, I run it using Podman and Quadlet units (Systemd), but pick your poison.
Tempsys is a monitoring system designed to measure the temperature of commercial refrigerators and freezers. It is meant to monitor the behavior of these units and anticipate any possible failures or misuse, thereby preventing food degradation.
It consists of an extremely power-efficient Bluetooth LE module coupled with a MCP9808 i2c digital thermometer. The whole system is powered by a single CR-2032 coin cell battery with autonomy of more than a year.
The low-power Bluetooth module is responsible for emitting advertising packets containing temperature data. A more powerful device connected to the main power will collect those results and send them using MQTT in line protocol format. On the backend, Telegraf and InfluxDB are used to collect and store those metrics. A Grafana dashboard is configured with alerts in case temperatures are sustained above a certain threshold.
On top of the temperature, the module will also send its current voltage and RSSI for observability purposes. This will help predict when it is time to change the battery or if the device needs to be moved for better reception.
- tempsys-hardware in-depth hardware description for the Tempsys device
- tempsys-firmware embassy-rs based firmware for Tempsys
- tempsys-scan Bluez based application to read the Bluetooth advertising events from Tempsys and ship them via MQTT
Here is a sample of what the dashboard looks like:
