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Voice & text control for Home Assistant using Telegram, Whisper & Gemini

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2/3/2026
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📝 Workflow Description

This workflow creates a conversational bridge between Telegram / n8n Chat and Home Assistant. It allows users to control smart home devices or request information using natural language (text or voice).

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🔑 Key Features

  • Multi-channel input: Works with both Telegram and n8n’s chat interface.
  • Voice support: Telegram voice messages are transcribed to text using OpenAI Whisper.
  • AI-driven assistant: Google Gemini processes queries in natural language.
  • Home Assistant integration: Uses MCP client tools to execute actions like turning devices on/off, adjusting lights, or broadcasting messages.
  • Memory management: Short-term memory keeps context within conversations.
  • Smart reply routing: Responses are automatically sent back to the correct channel (Telegram or chat).
  • Message formatting: Telegram replies are beautified (bold, bullet points, inline code, links).

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📌 Node Overview

  • Telegram Trigger: Captures incoming Telegram messages (text or voice).
  • Bot Is Typing: Sends a “typing…” action to indicate the bot is working.
  • Voice or Text: Separates voice and text inputs.
  • Get Voice File → Speech to Text → Transcription to ChatInput: Handles Telegram voice notes by downloading the file, transcribing it, and preparing it for the chat pipeline.
  • When Chat Message Received: Captures messages from n8n’s built-in chat interface.
  • Process Messages: Normalizes incoming data (input text, source, session ID, voice flag).
  • Home Agent: Main AI agent that processes queries.
  • Google Gemini Chat Model: Language model for intent understanding and conversation.
  • Simple Memory & Simple Memory1: Buffer memories to preserve conversation context.
  • Home Assistant Connector: MCP client node that executes smart home actions (turn on/off devices, adjust lights, etc.).
  • Reply Router: Routes the assistant’s response either to Telegram or to the n8n chat webhook.
  • Telegram Message Beautifier → Telegram Send: Formats and sends responses back to Telegram.
  • Respond to Webhook: Sends responses to n8n chat.

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🚀 Example Use Cases

  • Send “Turn on the living room lights” via Telegram → Bot triggers Home Assistant action.
  • Ask “What’s the temperature in the bedroom?” → Response comes back formatted in Telegram.
  • Record a voice note “Goodnight mode” → Automatically transcribed and executed by Home Assistant.
  • Use n8n chat to quickly trigger automations or check device statuses.

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⚡️ Benefits

  • Unified chat & voice control for Home Assistant.
  • AI-powered natural language understanding.
  • Works seamlessly across platforms (Telegram & n8n chat).
  • Extensible: new tools or intents can be added easily.

Voice/Text Control for Home Assistant using Telegram, Whisper & Gemini

This n8n workflow enables voice and text control for Home Assistant through Telegram, leveraging OpenAI's Whisper for speech-to-text and Google Gemini for natural language understanding. It provides a conversational interface to interact with your smart home devices.

What it does

This workflow automates the following steps:

  1. Listens for Telegram Messages: Triggers when a new message (text or voice) is received in a configured Telegram chat.
  2. Transcribes Voice Messages (if applicable): If a voice message is received, it uses OpenAI's Whisper to transcribe the audio into text.
  3. Prepares Chat History: It maintains a simple conversational memory to provide context to the AI agent.
  4. Processes with AI Agent: An AI Agent (powered by Google Gemini) interprets the user's request, considering the chat history.
  5. Executes Home Assistant Commands: The AI Agent uses a "MCP Client Tool" (likely a custom tool for Model Context Protocol) to send commands to Home Assistant based on the interpreted intent.
  6. Responds to User: Sends a textual response back to the user via Telegram, confirming the action or providing relevant information.

Prerequisites/Requirements

To use this workflow, you will need:

  • n8n Instance: A running n8n instance.
  • Telegram Bot Token: A Telegram Bot configured and its token for the Telegram Trigger and Telegram nodes.
  • OpenAI API Key: An OpenAI API key for the Whisper speech-to-text service.
  • Google Gemini API Key: Access to Google Gemini (likely via a Google Cloud Project) for the Google Gemini Chat Model.
  • Home Assistant Integration: A configured "MCP Client Tool" (Model Context Protocol Client) that can interact with your Home Assistant instance. This is a custom tool and its setup is external to this n8n workflow definition.

Setup/Usage

  1. Import the Workflow: Download the provided JSON and import it into your n8n instance.
  2. Configure Credentials:
    • Telegram Trigger: Set up your Telegram Bot API credential.
    • Telegram: Set up your Telegram Bot API credential.
    • OpenAI: Configure your OpenAI API key credential.
    • Google Gemini Chat Model: Configure your Google Gemini API key credential.
    • MCP Client Tool: Ensure the "MCP Client Tool" is correctly configured to communicate with your Home Assistant instance. This node's configuration details are not part of the provided JSON and would need to be set up separately.
  3. Activate the Workflow: Once all credentials are set, activate the workflow.
  4. Interact via Telegram: Send voice or text messages to your configured Telegram bot to control your Home Assistant.

Note: The "MCP Client Tool" is a critical component for Home Assistant integration. Its specific implementation and configuration are not detailed within this n8n workflow JSON and would need to be in place for the workflow to function correctly with Home Assistant.

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