ansemjo

PhD student at Universität Hamburg; working on distributed computation offloading using WebAssembly @wasimoff

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Hamburg, Germany
https://semjonov.de

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ansemjo / README.md

Last active July 21, 2025 21:29

Si4706 RDS Scanner

This is a Python script for a CircuitPython device (QtPy S3 in this case) connected to an Si4706-D50 over I2C to configure reception of FM radio stations with RDS signals and get somewhat accurate time information without any internet connection.

I've experimented with DCF77 before and found its signal strength to be wholly insufficient. Then at some point I bought a new radio with DAB+ support and was surprised when it suddenly set the correct time itself. And then it dawned on me: there's time information in FM radio signals as well!

The code will probably work for other Si470X chips as well. But most of the Arduino libraries with register-based operations did not work for me. Instead I followed Skyworks' AN332: "Si47xx Programming Guide" directly.

ansemjo / forgejo-borgmatic.yml

Last active January 15, 2025 07:11

a borgmatic configuration, which uses extra options to create archives from forgejo dumps on stdin

	# List of source directories and files to back up. Globs and tildes
	# are expanded. Do not backslash spaces in path names.
	source_directories:
	# Actually, this is interpreted as a command due to extra options below.
	- /usr/local/bin/forgejo-dump-stdout

	# If true, then source directories must exist, otherwise an error is
	# raised. Defaults to false.
	source_directories_must_exist: false # source is a command

ansemjo / .00_webtransport_quic_issue.txt

Last active April 10, 2024 17:03

WebTransport error reproducer

	This is a reproducer for https://github.com/quic-go/webtransport-go/issues/84

	USAGE
	git clone https://gist.github.com/72e1fc95a8c6e19cabfa750e45eae185.git
	cd 72e1fc95a8c6e19cabfa750e45eae185/
	bash gencerts.sh
	go run main.go

	Now open https://localhost:7443/ in Firefox.
	open the developer console with ctrl-shift-K

ansemjo / dcpsqldump.sh

Last active November 15, 2022 08:52

Create external backup of artfiles.de databases via phpMyAdmin panel behind DCP login.

	#!/usr/bin/env bash
	# Script to backup an artfiles database via phpMyAdmin behind DCP.
	# This is mainly useful for their "Private Web medium" plan because the
	# next larger plan includes SSH access, so you can just use mysqldump directly.
	# The exported SQL is piped to stdout and must be saved to a file or
	# piped further for compression, encryption, etc.
	# $ ./dcpsqldump.sh > database_$(date +%F).sql
	set -eu -o pipefail

	# -------- <TODO> --------

ansemjo / systemd_service_hardening.md

Created May 20, 2022 14:36 — forked from ageis/systemd_service_hardening.md

Options for hardening systemd service units

security and hardening options for systemd service units

A common and reliable pattern in service unit files is thus:

NoNewPrivileges=yes
PrivateTmp=yes
PrivateDevices=yes
DevicePolicy=closed
ProtectSystem=strict

ansemjo / complete.py

Created May 3, 2022 16:37

generate complete graphs where all nodes are connected with each other using graph-tool

	#!/usr/bin/env -S docker run --rm -it -v "${PWD}:/host" -w /host tiagopeixoto/graph-tool python complete.py
	# https://graph-tool.skewed.de/static/doc/generation.html#graph_tool.generation.complete_graph
	# usage: $ ./complete.py 64 && convert -density 300 complete-64.{pdf,png}

	from sys import argv
	n = int(argv.pop())
	print(f"Generate complete-{n} ...")

	from graph_tool import generation, draw
	gr = generation.complete_graph(n)

ansemjo / corefuse.py

Last active January 29, 2022 11:36

FUSE driver to interface with Jussi Kilpelainen's core memory shield. This gives you a four byte file to store all your precious memories in.

	#!/usr/bin/env python3

	"""
	FUSE driver to interface with Jussi Kilpelainen's core memory shield [0].
	This gives you a four byte file to store all your precious memories in.
	Get the Arduino code on his homepage [1]. I used the 2019-10-31 version.

	0: https://www.tindie.com/products/kilpelaj/core-memory-shield-for-arduino/
	1: https://jussikilpelainen.kapsi.fi/wordpress/?p=213
	"""

ansemjo / taskgathering.py

Last active July 31, 2021 19:31

print progress information while waiting for a number of async tasks to finish

	#!/usr/bin/env python3

	# This is free and unencumbered software released into the public domain.
	# Please refer to the terms of the "Unlicense" at https://spdx.org/licenses/Unlicense.html

	# demo: https://asciinema.org/a/FubNfdJELHAL80xcAJl0RA7OW

	import asyncio, random

	# random time with some gauss distribution

ansemjo / singlevue.html

Created January 29, 2021 15:56

an absolutely minimal vue app example with everything in one file (except for vue itself)

	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="utf-8">
	<meta http-equiv="X-UA-Compatible" content="IE=edge">
	<meta name="viewport" content="width=device-width,initial-scale=1.0">
	<title>SingleVue</title>
	</head>
	<body>
	<noscript>

ansemjo / ubuntu-cleaner.sh

Last active December 8, 2024 00:56

Clean up unwanted packages on a fresh installation of Ubuntu 20.04 LTS

	#!/usr/bin/env bash
	set -eu

	# mark a few packages as explicitly installed
	mark-wanted() {
	apt install -y \
	bash git tmux vim htop \
	unattended-upgrades \
	software-properties-common;
	}

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