n8n Telegram Yes/No Oracle: OpenAI + Google Sheets

n8n Telegram Yes/No Oracle that answers in audio, with Google Sheets logging and a light flash

Send a message to your Telegram bot and this n8n workflow will generate an “oracle” yes/no verdict—processing text directly or transcribing voice notes with OpenAI—then replies back in Telegram with an OpenAI TTS audio message, an HTML certificate, and a logged record in Google Sheets. It also triggers an HTTP request to flash a Tapo light.

What this workflow does

• Telegram trigger: Starts when a new Telegram message is received by your bot.
• Message type handling: Detects whether the incoming message is text or a voice note and rejects unsupported message types.
• Voice-to-text: If it’s a voice note, downloads the audio from Telegram and transcribes it with OpenAI; otherwise uses the text as-is.
• Question validation + acknowledgement: Normalizes/validates the question, sends an acknowledgement back to Telegram, then waits briefly before processing.
• Entropy-based yes/no logic: Calls two sub-workflows—one to analyze “spiritual weight” and another to gather multiple external entropy signals—then combines them into a final entropy score and decision index.
• Verdict formatting + parallel outputs: Uses a formatting sub-workflow to produce the final oracle verdict and a TTS script, then distributes outputs.
• Telegram responses: Generates OpenAI TTS audio and sends it back, creates an HTML certificate, and sends it as a Telegram document.
• Compliance + logging: Appends a log row to Google Sheets, runs an EU AI Act compliance logging sub-workflow, and triggers a Tapo light flash via an HTTP request.

Use cases

• Interactive Telegram-based “yes/no” decision support using an entropy-derived index.
• Voice-first oracle sessions where users can speak questions and receive spoken answers.
• Auditable automation: store outcomes in Google Sheets and record EU AI Act compliance logs.
• Light/IoT feedback: coordinate a Tapo light flash with each oracle result.

Technical details

• Core nodes: if, code, wait, Telegram, Sticky Note, HTTP Request.
• AI: OpenAI transcription for voice notes and OpenAI TTS for audio replies.
• Data logging: Google Sheets row append.
• Compliance: EU AI Act compliance-logging sub-workflow.
• IoT trigger: HTTP request to activate a Tapo light flash.

Setup note: Create a Telegram bot with BotFather, add the Telegram API credential in n8n, and start a chat so the bot can receive messages.