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Moxy - Homelab IoT Platform

Overview

Moxy is a Homelab IoT "Platform" (for lack of a better term) that blurs the lines between hardware and software in the homelab. Here are the principal components of the platform:

  • Centralized server power management using relays and current sensors
  • Environmental sensors reporting real time metrics from the homelab
  • Physical "dashboard" to display guages using old-fashioned panel meters, backlit by neopixels for extra color indication

Physical front panel interface: PWM-controlled panel meters, LCD screen, and rotary encoder

Physical panel meters and LCD/rotary encoder interface

Home Assistant interface: communication coordinated via MQTT

Moxy Home Assistant Dashboard Screenshot

Hardware Schematic

Moxy schematic

Prerequisites

Server-side

  • MQTT
  • Python 3
  • I2C - to connect to microcontrollers and ADCs for sensors, analog meters (pwm), and LCD screen
  • GPIO - for controlling relays and rotary encoder input
  • Home Assistant

Device-side

  • 5 ADC pins
  • 4 PWM pins
  • 16x2 I2C LCD Screen
  • 4x 30V 10A relays w/ optocouplers
  • 4x ACS712 Hall-effect current sensors
  • DHT11 temperature + humidity sensor
  • MQ2 gas sensor
  • Arduino-compatible microcontrollers

10A Relay Modules on (left), 20A hall-effect current sensor modules (right), XT60 output connectors (top right)

Moxy Home Assistant Dashboard Screenshot

Installing as a service

A bash script is included to assist in creating services for server-side components in systemd. See below for helpful commands on managing the services.

Linux installation

  1. Modify service definitions in service_definitions directory to reflect the location of the Python executables
  2. Copy config.ini.sample to config.ini and replace values for your MQTT broker
  3. Run ./install_systemd_services.sh - if successful, script will automatically start tailing journalctl logs to verify the services started successfully

Helpful Commands

Tail all logs

journalctl --follow _SYSTEMD_UNIT=moxy.relays.service + _SYSTEMD_UNIT=moxy.sensors.service + _SYSTEMD_UNIT=moxy.panel.service

Tail individual log

journalctl -u moxy.{serviceName}.service -f

Restart all services

systemctl restart moxy.panel.service
systemctl restart moxy.sensors.service
systemctl restart moxy.relays.service