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The Raspberry Pi doesn't really have a proper audio interface. What options are available to give it one? This is a list o I2S-based Raspberry-Pi-compatible add-on boards (HATs) that also provide amplification, so you can directly connect at least two speakers.

• IQaudioIO's Pi-DigiAMP+
• Allo's Piano 2.1 HiFi DAC + Volt AMP
• LOCO DAC AMP
• Collybia's Mamboberry HiFi DAC + external amplifier
• HiFiBerry AMP+

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redux-api provides an easy and flexible way to interface with REST APIs in Redux (e.g. when building a React app). It works pretty well when there you know beforehand what API calls you're going to make, and define them in its configuration object.

But when you want to make multiple calls to the same endpoint, and don't know beforehand how many, you're a bit out of luck. In my case, I had a product listing where each product had a category and a score. In a summary overview, I wanted to show a histogram of the scores for each category. That means: first a request to the categories endpoint, and then for each of the categories, a request to the histogram endpoint.

This is an example of how to do that.

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d3.chart.sankey: Reusable D3 Sankey diagram using d3.Chart.

D3's classic energy sankey diagram built using d3.chart.sankey.

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d3.chart.sankey: Reusable D3 Sankey diagram using d3.Chart.

Interactive Sankey diagram.

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#!/usr/bin/env python
#
# Export network-manager WiFi connection details to a wpa-supplicant
# file. This can be saved to an Android device, so you have all your
# laptop's WiFi connections on your phone right away (root required).
#
#    python gen_wpa_sup.py >foo
#    adb push foo /sdcard/foo
#    adb shell
#    su -c 'cat /sdcard/foo >>/data/misc/wifi/wpa_supplicant.conf'

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#!/bin/sh
#
# Update freevpn.se pptp configuration
#
# Since the password changes now and then, it's useful to update it automatically.
# Make sure you've installed lynx. Tested on Debian.
#

URL=https://www.freevpn.se/accounts/
PEERNAME=freevpn.se

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#
# Installation script for scrapyd on Debian/Ubuntu
# http://scrapyd.readthedocs.org/
#
# - Latest scrapyd from Scrapy package repository
# - Password protection with http basic auth
# - HTTPS with self-signed certificate
# - Works on Amazon EC2
#
FQDN=scrapy.example.com

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OpenLabeler is a pretty nice image annotation package, but I had issues getting it to run. Plus I'd rather use the system-supplied Java environment, instead of a bundled one, and install it for a user (not in the system).

This happens on a Debian or Ubuntu system (with apt and deb tools available).

1. Download deb package of latest release.
2. Extract its contents: dpkg-deb -x ~/.local/openlabeler openlabeler-1.2.0.deb
3. Make sure you have OpenJDK 11 installed plus apt install libopenjdk-11-jre libopenjfx-java
4. Cleanup directory structure: cd ~/.local/openlabeler && mv opt/OpenLabeler/* . && rmdir opt/OpenLabeler opt

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d3.chart.sankey: Reusable D3 Sankey diagram using d3.Chart.

This diagram shows how the ingredients may contribute to the total sustainability of a chocolate bar through different issues.

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#!/usr/bin/env ruby
#
# We start with the list at:
#   http://www.fao.org/fishery/collection/asfis
# Then we query FishBase (and SeaLifeBase) for the ID and NL name.
#
# Before running this script, make sure you have the ASFIS spreadsheet,
# and make sure you've created the CACHEDIR directory (which stores all
# requests, so you can run this again without having to wait for the requests).
#