Masatoshi Nishiguchi's Blog

Build Phoenix Docker Compose development environment easily

I wrote a script called phx-docker-compose-new that can be used instead of mix phx.new to generate a new Phoenix application. Building the development environment for a Phoenix application using Docker Compose is convenient because you can set up not...

Nov 29, 20232 min read

Raspberry Pi TensorFlow Liteで物体検出を楽しむ

この記事について Raspberry Pi、TensorFlow、Pythonのいずれにも詳しくない筆者が、物体検出をやって楽しんだ成果の記録です。 TensorFlow公式の物体検出のサンプルプログラムを実行します。動作環境ボード Raspberry Pi 4 Model B OS Raspberry Pi OS (32-bit または 64-bit) デスクトップ環境カメラ Raspberry Pi カメラモジュール v2 Python Python ...

Apr 23, 20231 min read

Elixir Phoenix 1.6 Esbuild + SCSS

One day I was trying to upgrade one of my Phoenix 1.5 apps to Phoenix 1.6. In that app, I customize Bootstrap styles using SCSS. I want to talk about what I found and stumbled on when setting up SCSS. TIL All explained in Phoenix 1.6 Asset Managemen...

Dec 4, 20213 min read

Elixir Circuits.I2C with Mox

This is written in Japanese. I might convert it to English later, maybe. はじめに Elixirのテストでモックを用意するときに利用するElixirパッケージとして、moxが人気です。Elixir作者のJosé Valimさんが作ったからということもありますが、ただモックを用意するだけではなくElixirアプリの構成をより良くするためのアイデアにまで言及されているので、教科書のようなものと思っています。一言でいうと「その場...

Dec 3, 20213 min read

Elixir Access behaviour

TIL Access supports keyword lists (Keyword) and maps (Map) out of the box, but not structs. There is a reason why Elixir does not implement Access behaviour for structs. Perfer data.key for accessing predefined atom keys of map or struct. Access be...

Nov 14, 20212 min read

Connect Nerves devices forming an Erlang cluster

I want to enable my Nerves devices to talk to each other using Distributed Erlang. Here is my memo. Preparation Find hostname or IP address for each device When shelling into a Nerves device, we will see IP address and host name printed by nerves_mot...

Oct 23, 20212 min read

URL shortener with Elixir Phoenix 1.6 and LiveView

I wanted to make a simple URL shortnener app like Bitly using Phoenix.LiveView. This article called URL shortener with Elixir and Phoenix by Aleksi Holappa was helpful when I started off. What I want to do User is able to create a short link to a gi...

Oct 17, 20218 min read

Switch between SQLite and PostgreSQL based on MIX_ENV in Elixir Phoenix

I like the simplicity of SQLite for my local development; however when I deploy my app to a cloud platform like Gigalixir, Fly.io, etc, often PostgreSQL is preferred. I was wondering if I can switch between them based on MIX_ENV. Elixir version etc e...

Oct 17, 20212 min read

Use DYP-A01 ultrasonic distance sensor in Elixir

にほんご The other day I played with DYP-A01 ultrasonic distance sensor on my Nerves-powered Raspberry Pi. Here is my note. Long story short I wrote an Elixir program that enables us to communicate with an ultrasonic sensor through serial ports on Rasp...

Sep 4, 20214 min read

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