romilly

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

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

romilly

"""
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):

romilly

# -*- 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}"

romilly

# ***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):

romilly

#!/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

romilly

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)

romilly

"""
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.

romilly

Testing a Pico-based function generator

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

romilly

Pico AF oscilloscope

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

romilly

"""
Example for remote control from host via Serial link.

This is the code to run on the Pico.
It sets up the onboard LED and allows you to turn it on or off.
"""
from machine import Pin

# use onboard LED which is controlled by Pin 25
# on a Pico W the onboad lLED is accessed differently,