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Nicko van Someren nickovs

  • Absolute Software
  • Boulder, CO, USA
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@nickovs
nickovs / pico_touch.py
Created February 26, 2024 14:21
RP2040 / Pi Pico touch interface using just one resistor
View pico_touch.py
# Simple Pi Pico/RP2040 touch interface
# This implements a capacitive touch interface using two GPIO pins and just one external resistor.
# It work by using the user's body as a capacitor to ground; the output GPIO pin goes through the
# resistor to the touch point, which is connected directly to the input GPIO pin. A PIO program
# periodically toggels the output pin and then counts the number of cycles until the input pin
# changes level. The time constant for the response is proportional to both the fixed resistor
# value and the capacitance at the touch point, which varies depending on if the user is touching
# or not. With the default setting a 2.2 megaohm resistor works well.
@nickovs
nickovs / get_public_ip.py
Created January 17, 2024 18:35
A tool for fetching your current public IPv4 address
View get_public_ip.py
#!/usr/bin/env python3
from random import shuffle
from sys import exit, stderr
from urllib.request import urlopen
from urllib.error import URLError
urls = [
"ifconfig.me",
@nickovs
nickovs / make_git_layer.sh
Created March 13, 2023 16:41
A script to build an AWS Lambda overlay layer that installs `git` and all its dependencies.
View make_git_layer.sh
#!/bin/bash
# Build an AWS Lambda zip file containing git and its dependencies
cat <<\EOF > tmp_build.sh
#!/bin/bash
# Comment this out if you want to see all the actions.
quiet=-q
# List of main executables from /usr/bin to copy into layer
@nickovs
nickovs / badger_orion.py
Created May 28, 2022 19:30
A simple script for receiving water meter readings from a Badger ORION water meter using an Software Defined Radio (SDR).
View badger_orion.py
#!/usr/bin/env python3
# A simply tool for receiving water meter readings from a Badger ORION water meter.
# Device radio details can be found at https://fccid.io/GIF2006B
# Requires rtl_433 to be installed. See https://github.com/merbanan/rtl_433
import sys
import json
import subprocess
@nickovs
nickovs / docker-remount.sh
Created April 17, 2022 16:51
A script to mount a host directory into a running Docker container
View docker-remount.sh
#!/bin/bash
# A script for mounting a host directory into a running Docker container
if [ "$#" -ne 3 ]; then
echo "Usage: $0 <container> <host path> <target path>"
exit 1
fi
CONTAINER=$1
@nickovs
nickovs / zbar_lambda_build.sh
Last active December 27, 2023 19:02
A script for building a version of the Zbar library suitable for running in an AWS Lambda instance
View zbar_lambda_build.sh
#!/bin/bash
# Clear out old images
[ -d "lib" ] && rm -r lib
cat <<EOF > tmp_recipe.sh
# This is the actual container-side recipe
yum groupinstall -y "Development Tools"
cd /root
@nickovs
nickovs / curve25519.py
Created June 29, 2021 20:39
A pure Python implementation of Curve25519
View curve25519.py
"""A pure Python implementation of Curve25519
This module supports both a low-level interface through curve25519(base_point, secret)
and curve25519_base(secret) that take 32-byte blocks of data as inputs and a higher
level interface using the X25519PrivateKey and X25519PublicKey classes that are
compatible with the classes in cryptography.hazmat.primitives.asymmetric.x25519 with
the same names.
"""
# By Nicko van Someren, 2021. This code is released into the public domain.
@nickovs
nickovs / stepper.py
Last active November 14, 2023 22:07
A stepper motor driver for MicroPython
View stepper.py
# stepper.py
# A micropython driver for 4-phase, unipolar stepper motors such as
# the 28BYJ-48
# Relesed to the Public Domain by Nicko van Someren, 2020
# The constructor for the Stepper class takes as arguments the four
# pins for driving the motor phases, in phase order, and optionally a
# timer. The pins can be passed as pin numbers or machine.Pin objects
@nickovs
nickovs / Hypercircumsphere.ipynb
Last active February 18, 2021 15:47
Compute the N-dimentional (hyper-)circumsphere
View Hypercircumsphere.ipynb
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View Bezier Quadratic.ipynb
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