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reinderien /
Last active Jan 27, 2020
KwartzLab Electronic Session with Greg


This is a handful of sessions to learn various subjects in electronics, including component selection, mains safety, a little bit of embedded design and programming, prototyping, and CAD. It will be done by making a simple clock with easy-to-manipulate through-hole parts.

These sessions are to be run separately from Ryan's KiCad session because this has a different focus - electronics basics - and uses a different CAD program, Eagle, because it's what I'm familiar with. All software used is free.

Attendees are to bring their laptop, note-taking material, and a calculator if they have one. (Math will not exceed the elementary school level.) Grid paper is recommended but not necessary. Bring $20.00 in total (not per session) to cover the cost of parts. If the attendee elects to purchase fabrication, that cost will be separate.

In the lab we will be using oscilloscopes, power supplies, multimeters and prototyping parts brought in for this project.

reinderien /
Created Aug 15, 2019
xlsxwriter and insane units

Welcome to the descent into madness that is Excel units.

xlsxwriter has this lovely nugget that, unless you really care about exact column widths, you probably never had the urge to look up:

# Convert column width from user units to character width.
# For Calabri 11.
max_digit_width = 7
reinderien /
Last active Jan 26, 2018
pfSense 11.1 with OpenConnect
reinderien / particle math.txt
Created Dec 21, 2017
Particle Math (Advent 2017 20.1)
View particle math.txt
min[lim t→∞ ∑ | p_i + ∫v_i dt + ∫∫a_i dt |
~ min[ ∑ |a_i| ]
from bs4 import BeautifulSoup
from requests import Session
import csv
def ref(head):
return '%s%d' % (chr(ord('A') + theads.index(head)), irow)
sess = Session()
theads = ('Breed Name', 'Tested', 'Passed', 'Failed', 'Percent')