TuringBirds turingbirds

Linux installation notes

A giant ball of yarn containing notes on how to set up Debian/KDE Linux, with tips on useful software and commands.

Increase console font size

setfont /usr/share/consolefonts/Lat7-Terminus28x14.psf

Connect an IP camera via wired ethernet to an ethernet USB adapter to a Raspberry Pi

Connect the camera to the ethernet USB adapter via a CROSSOVER cable (or via an ethernet switch).

Install DHCP server:

sudo apt install isc-dhcp-server

From InkScape to DXF

1. Save in Inkscape as PDF

Draft your design in InkScape. If there's any text, convert it to a path before or during exporting (Path → Object to Path).

Save as PDF (tested PDF v1.5).

ltspice options for high precision simulation/data export

Uses backward Euler integration (maxord=1 option), which can be very slow.

Set maximum iteration counts: DC iteration count limit (itl1, default: 100), DC transfer curve iteration count limit (itl2, default: 50), and transient analysis time point iteration count limit (itl4, default: 10) [ltwiki]_.

.OPTIONS maxord=1

GPIB interfacing using Agilent 82357B on Ubuntu Linux

I initially had some problems installing on my laptop, so decided to boot Ubuntu 12.04.5 LTS, 3.13.0-32-generic from USB and work from there.

For an automated installation script, see gpib_install.sh (and gpib.conf) below. The rest of this document describes the actions of the installation script step-by-step.

First, get the packages that are necessary to support Python bindings:

	# Get the distance and orientation of a QR code and plot a little XYZ axis gizmo in red/green/blue on top of the image.
	# This gets really nice low latency across a local wifi network, but the QR code detection can be a bit jumpy sometimes.
	# We try both the zbar and opencv libraries for QR code detection.
	#
	# This software is distributed under the "CC0 1.0 Universal (CC0 1.0)" license.
	# You should have received a copy of the CC0 Public Domain Dedication along with this software. If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.

	import datetime
	import math
	import numpy as np

	#!/bin/bash

	# I do not want my screensaver to auto-activate after a timeout.
	# For some reason, you have to select a nonzero, finite timeout value for xscreensaver (there's no "infinity").
	# I only want my screensaver to active when I lock my system by pressing [Meta]+[L].
	# This hotkey is set up to launch this script, which
	# - starts the xscreensaver daemon,
	# - activates the screensaver (with lockscreen enabled),
	# - waits for it to terminate (unlocking logs an "UNBLANK" event),
	# - then kills the xscreensaver daemon.

	// Beveled wedge shape for OpenSCAD

	// Written by C.A.P. Linssen <[email protected]>, Sept 2018

	// This software is distributed under the "CC0 1.0 Universal (CC0 1.0)" license.

	// You should have received a copy of the CC0 Public Domain Dedication along with this software. If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.


	// module bwedge