Project Hub /IoT & Connected Devices/Smart Home & Building Automation/Build Home Automation System with Apple HomeKit and ESP8266

Intermediate

ESP8266

₹500 – ₹1,500

3 – 6 Hours

Complete Kit

Build Home Automation System with Apple HomeKit and ESP8266

This IoT-based project allows you to control four home appliances using Apple HomeKit and an ESP8266 NodeMCU without needing Homebridge.

Originally published on ElectronicsForU

View original tutorial

Parts You'll Need

This project is sourced from another site, not written by us — this list is our best match of their components against what we stock, not a verified bill of materials. Always check the original blog (linked above) for the actual parts list before buying.

5V 1 Channel Relay Module Rs. 87.00
NodeMCU ESP8266 WIFI development board based on CP2102 Rs. 660.00
Jumper Wire 10 Pin Male To Male 20cm Rs. 45.00
10pcs 5mm RED Diffused Light Emitting Diodes - LEDs Set Rs. 39.00
400 Points Mini Solderless Prototype PCB Breadboard High Quality Rs. 89.00
MB102 Adjustable Breadboard Power Supply Module (3.3V & 5V) for Arduino & Raspberry Pi Rs. 139.00
Jumper Wire 10 Pin Male To Female 20cm Rs. 45.00

Selected: Rs. 0.00

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How It Works

This home automation system functions by integrating an ESP8266 NodeMCU microcontroller directly into the Apple HomeKit ecosystem using the Arduino-HomeKit-ESP8266 library, completely bypassing the need for a bridge like Homebridge. The NodeMCU connects to your local Wi-Fi network, where it acts as a native HomeKit accessory. When you issue a command from your iPhone (such as using the Home app or Siri), your iOS device communicates over Wi-Fi with the ESP8266. Upon receiving the digital signal, the NodeMCU changes the state of its general-purpose input/output (GPIO) pins. These low-voltage digital signals are wired to the inputs of a 5V relay module. Inside the relay module, an electromagnetic coil is energized or de-energized by a transistor switch driven by the NodeMCU pin. This isolates the low-voltage microcontroller logic from the high-voltage side. When the relay triggers, its internal mechanical switch closes or opens a circuit connected to a 230V AC bulb holder, allowing you to safely control the power flow to a 60W or 100W incandescent bulb using standard household mains electricity.

Why Build This

Integrate custom IoT hardware directly with Apple HomeKit and Siri voice commands without purchasing expensive commercial smart plugs or a Homebridge server.

Gain practical undergraduate-level experience interfacing low-voltage microcontroller logic with high-voltage AC mains appliances safely using relays.

Develop functional firmware using the Arduino IDE and specialized networking libraries to handle wireless communication and accessory provisioning.

Real-World Application

Smart home automation for controlling lights and electrical appliances using Apple iOS devices and voice commands.

Skills You'll Learn

Wi-Fi microcontroller networking

relay interfacing

AC mains wiring safety

HomeKit accessory protocol implementation

digital GPIO control

Safety Precautions

Exercise extreme caution when working with 230V AC mains electricity. Ensure power is disconnected before making wiring connections to bulb holders and relay modules.

Technology Tags

IOT

APPLE HOMEKIT

SIRI

WI-FI

RELAYS

HOME AUTOMATION

Frequently Asked Questions

Do I need a Raspberry Pi or Homebridge to make this work with Apple HomeKit?

No, this project uses the Arduino-HomeKit-ESP8266 library, which allows the NodeMCU to act as a direct, native HomeKit accessory without any intermediate bridge.

Can I control appliances other than a light bulb with this setup?

Yes, any electrical appliance within the electrical rating limits of the relay module can be wired to the relay contacts instead of the bulb holder.

What iOS devices are compatible with this home automation system?

Any iPhone supporting Apple HomeKit, including the iPhone SE and newer models running iOS with the Apple Home application installed, can control the system.

Gallery

This page is part of Kitkraft's Project Hub — a curated collection of electronics & robotics projects gathered from the maker community to help students and hobbyists discover and learn to build. Kitkraft does not claim authorship of the original project, and makes no representation as to the accuracy, completeness or safety of third-party source material. The summary and "How It Works" explanation above are AI-generated, rewritten with reference to the original tutorial — not a reproduction of it. Full credit and a direct link to the original source are provided above. If you're the original creator and have a concern about how your work is represented here, please contact us and we'll address it promptly.

Kitkraft Project Hub — curated from the maker community, credited at the source.

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