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Voice Services on Raspberry Pi 5 (Trixie)

Wake word detection, speech-to-text, and text-to-speech as independent MQTT-connected services on a Raspberry Pi 5 (8 GB) running Raspberry Pi OS Trixie (Debian 13, 64-bit).

Architecture

Two independent services communicate via MQTT:

STT service: microphone → openwakeword (wake word) → faster-whisper (transcribe) → MQTT publish to voice/transcript

Five Whys Root Cause Analysis

After a defect or problem has been fixed, use this command to find the root cause and prevent recurrence.

Process

Ask me to describe the defect or problem that occurred
Ask "Why did this happen?" and wait for my response
Based on my answer, ask "Why?" again, probing deeper
Continue until we reach a root cause (typically 3-6 iterations) - stop when we hit something systemic rather than symptomatic

Testing a Pico-based function generator

I've moved the journal and code for fungen to the Pico Code Project on GitHub.

Pico AF oscilloscope

I've moved the journal and code for the 'scope to the Pico Code Project on GitHub.

	"""
	PeekyReader - A TextIO wrapper that allows peeking at the next line.
	"""
	from typing import TextIO


	class PeekyReader:
	"""A TextIO wrapper that allows clients to peek at the next line before reading it."""

	def __init__(self, text_io: TextIO):

	# -- coding: utf-8 --

	"""
	Convert a note pitch like A#4 to its frequency.
	"""

	# Generate a unique pitch for a note based on its pitch class and octave.
	def name(pitch_class: str, octave: int) -> str:
	return f"{pitch_class}{octave}"

	# *WARNING*
	# Running this file will delete all files and directories from the micropython device it's running on
	# If you run keep_this=False it will delete this file as well.

	# see https://docs.micropython.org/en/latest/library/os.html for os function list

	import os


	def _delete_all(directory='.', keep_this=True):

	#!/usr/bin/env bash
	# capture wordcounts in dayfile
	# invoke with project root as argument; default is (currently) start-apl
	# assumes book contents are markdown files in the `manuscript` directory
	# creates a `progress` direectory if necessary
	# writes wordcounts (using wc) for each markdown file and totals in a file whose name is based on today's date
	_project=${1:-start-apl}
	cd ~/git/active/$_project/
	_now=$(date +"%Y%m%d")
	mkdir -p progress

	import xml.etree.ElementTree as ET
	import html2text


	def convert(enex_file_name: str, markdown_file_name: str) -> None:
	enex = ET.parse(enex_file_name)
	root = enex.getroot()
	note = root.find('note')
	html = note.find('content').text
	text = html2text.html2text(html)

	"""
	MicroPython code to read and write from UART1 on the Pico


	UART0 is not available as it is used for the REPL.

	To test, you can use a 3V3 FTDI cable or similar device that connects a host computer with the Pico.
	NB: Make sure it's a 3V3 cable, not a 5V cable, or you could kill your PIco!!

	Connect FTDI black to Pico GND.