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Avery J. Parker Practical maker tech — AI tools, 3D printing, Raspberry Pi & ESP32

Project · Intermediate · Raspberry Pi

Raspberry Pi + ESP32 Mesh Network Project for Smart Home

· ESP32 , Raspberry Pi

Pi as the brain, ESP32 nodes on ESP-NOW or MQTT — a realistic small-home mesh without buying a vendor lock-in hub.

Written by

Avery J. Parker

IT veteran, maker educator, and author of Network Ninja, 3D Printing Mastery, and AI Workflow Mastery. Business IT: Diversified Tech Solutions.

Project template

  • Goal & materials
  • Steps / firmware
  • Troubleshooting
  • AI assist notes
  • Related gear & books
Free starter kit Gear shortlist

Goal: a handful of ESP32 sensor/actuator nodes talking to a Raspberry Pi coordinator you control.

Depth checklist: materials → steps → troubleshooting → AI assist → related gear/books. See also the gear shortlist and free ESP32 kit.

Two solid patterns

Raspberry Pi as MQTT/log coordinator with ESP32 sensor and relay nodes in multiple rooms.
Raspberry Pi as MQTT/log coordinator with ESP32 sensor and relay nodes in multiple rooms.
  • MQTT — Mosquitto on the Pi; ESP32 clients; easy dashboards (Home Assistant optional)
  • ESP-NOW — low-latency peer frames; Pi still useful as a Wi‑Fi bridge / logger via one gateway ESP32 on USB

Parts

  • Raspberry Pi 4/5 (wired Ethernet preferred)
  • 2–5 ESP32 DevKits
  • Sensors (BME280), relays (low voltage first)

Build order

  1. One ESP32 + serial proof (see first project)
  2. MQTT “hello” retained messages
  3. Sensor topic + threshold automation on Pi (Python or Node-RED)
  4. Relay topic with manual override
  5. Only then: mesh topology / multi-room RF reality checks

Failure modes

  • 2.4GHz congestion — test RSSI room by room
  • Power: wall warts > long USB cable runs
  • Security: don’t expose MQTT to the internet raw; VPN or local-only

Related books: Network Ninja for the networking toolkit mindset; radio folks also like KI4TQN for emcomm-grade PACE thinking.

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