IoT Smart Home Automation — Voice Controlled Home Assistant

Voice-activated home controller that interprets natural-language commands and drives devices directly, no fixed grammar.

A voice-activated smart home control system integrating the Google Gemini API for natural-language command parsing, driving Arduino-controlled devices directly. Ranked in the top 12 of more than 250 teams at GDSC DevJams 2024.

Parsing: Gemini API
Devices: Arduino
Result: Top 12 / 250+

What it had to solve

Voice control in the home usually means learning the system’s phrasing rather than the system learning yours — a fixed grammar of trigger words that fails the moment someone says the same thing a different way. Removing the grammar means something has to interpret intent from open language, and then turn that intent into a signal a microcontroller can act on.

The decisions that shaped it

An LLM instead of a command grammar

The Gemini API parses natural-language commands, so the system resolves intent rather than matching phrases. That removes the memorised vocabulary that makes most home automation feel brittle — a request works because it means something, not because it was worded correctly.

Straight through to the hardware

Parsed intent drives Arduino-controlled devices directly. Keeping the path from language to actuation short is what stops the round trip feeling like a query rather than a control action.

Media as a first-class target

The Spotify API is wired in alongside the physical devices so that playback is one of the things a command can address, rather than a separate app the same voice request cannot reach.

Built under hackathon constraints

The whole system was built and demonstrated at GDSC DevJams 2024 and placed in the top 12 of more than 250 teams — the scope was set by what could be made to work end to end in the time available.