scruss

// hoot-nanny paper - scruss, 2022-02

$fn = 192;
in = 25.4;
paper_diameter = in * (5 + 3 / 4); // 146.050 mm
hole_diameter = in / 4;            //   6.350 mm
hole_pcd = in * (5 + 29 / 32);     // 150.019 mm

difference() {
  circle(d = paper_diameter);

scruss

// do simpler n-gons print more quickly?
// scruss, 2025-03 - OpenSCAD
// after: https://fosstodon.org/@linux_mclinuxface/114151938845634308

// n-gon area, given n and radius
function a(n, r) = (1 / 2) * n * r * r * sin(360 / n);
// n-gon radius, given n and area
function r(n, a) = sqrt(2 * a / (n * sin(360 / n)));

height = 10;

scruss

// kite for rotation square thingy - scruss, 2025-02

/*
ECHO: "b:", 14.4721
ECHO: "h:", 5.52786
ECHO: "h+b:", 20
ECHO: "(h+b)^2:", 400
ECHO: "b-h:", 8.94427
ECHO: "(b-h)^2:", 80
ECHO: "Part area:", 80

scruss

# benchmark Mandelbrot set (aka Brooks-Matelski set) on OLED
# scruss, 2025-01
# MicroPython
# -*- coding: utf-8 -*-

from machine import Pin, I2C, idle, reset, freq

# from os import uname
from sys import implementation
from ssd1306 import SSD1306_I2C

scruss

REM --- Music
REM --- Reads easy to generate music commands and plays them.
REM --- Any four voice song can be played by simply changing the
REM --- DATA statements after the label Song:

    DEFINT A-Z 

    REM --- Display Picture
    OPEN "MusicPict" FOR INPUT AS 1
    PICTURE (100,50),INPUT$(LOF(1),1)

scruss

# -*- coding: utf-8 -*-
# scruss, 2024-12
# MicroPython
"""
 a very simple Cheerlights MQTT client for MicroPython
 Uses Peter Hinch's MicroPython Asynchronous MQTT library
  — https://github.com/peterhinch/micropython-mqtt/

 Install it with:
  mpremote mip install github:peterhinch/micropython-mqtt

scruss

#!/usr/bin/env micropython
# write a threatening pattern to a pbm
# scruss, 2024-11
# MicroPython has framebuf, but no math.isqrt()
# Python3 has no framebuf, but has math.isqrt()

import framebuf
from math import sqrt

WIDTH = 1280 # original target was a 128 x 64 OLED

scruss

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# scruss, 2024-10

from itertools import combinations
from textwrap import wrap
import random

random.seed(None)

scruss

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# csvthing - clean up horrid csv so it will work with q and SQLite
# scruss, 2022-06


import sys
import csv

if len(sys.argv) < 2:

scruss

#!/bin/zsh -f
# capacitor discharge - scruss, 2023-11
#  - this should work with bash too but the formatting may be off
#  - weird narrow format was designed for thermal printer output

if
    [ "$#" -lt 3 ]
then
    echo "usage: $0 resistance capacitance voltage [V₀]"
    exit 1