Raspberry Pi 4 Model B // On-Device Voice Assistant

Rush Butler — Control & Voice Console

100% on-device wake word, Vosk speech-to-text, Piper neural voice synthesis, Spotify Connect, WiFi presence greeter, and executive workflow automation.

Wake Word: "Hey Jarvis" / "Rush"

Rush Butler Ready (Idle)

Latency: 180ms

Rush Butler Chat Thread

Piper Neural TTS

Hello, I'm Rush. How may I assist your inquiry today?

Rush • Just now

Sample Voice Commands (Click to Test):

systemd journalctl -u pi-butler -u pi-greeter -f

[11:38:02]INFO[pi-butler]Vosk 16kHz speech recognition model loaded (models/vosk-model-small-en-us-0.15)

[11:38:04]INFO[pi-butler]Piper TTS voice initialized (en_US-lessac-medium.onnx)

[11:38:08]INFO[raspotify]Spotify Connect daemon ready as "Pi Butler" (ALSA hw:1,0)

[11:38:12]INFO[pi-greeter]ARP scanner daemon bound to wlan0. Interval: 20s. Cooldown: 30m

[11:38:20]TRIGGER[pi-butler]Wake word "Hey Jarvis" primed with threshold 0.50

100% On-Device Privacy Architecture

Zero-Cloud Speech Pipeline

Unlike cloud-dependent voice hubs, Rush Butler processes wake-words, speech-to-text, and speech synthesis entirely within the local Raspberry Pi 4 CPU cores:

>Wake Word: Configurable OpenWakeWord / Precise ("Hey Jarvis" threshold 0.5)
>Speech-to-Text: Vosk small en-US offline model (40MB RAM footprint, ~180ms latency)
>Voice Synthesis: Piper ONNX neural model (Lessac Medium, <100ms generation)
>Network Greeter: Subnet ARP broadcast listener for instant presence detection

Executive AI Link & Task Sync

n8n + Gemini

Telegram bot bridge powered by Google Gemini AI and n8n workflows. Automatically summarizes incoming URLs, transcripts, and voice memos into structured action digests.

Simulated Telegram Ingestion:

> URL: https://arxiv.org/abs/2405.04434
> Gemini Action: Extracted 3 executive takeaways, scheduled review reminder for 07:00 PM.

Deployment Blueprint

Hardware PlatformRaspberry Pi 4 Model B

Operating SystemRaspberry Pi OS 64-bit

Audio In/OutALSA USB Mic + 3.5mm Speaker

Media PlaybackSpotify Connect (Raspotify)