John Jerald De Chavez

Laboratory / Notes from the workbench

Working notes, made useful.

The Laboratory is my engineering notebook: practical guides, experiments, and reference notes created while learning, debugging, and building. Some articles are polished tutorials; others are working notes that I continue to update.

Latest notes / 2025

Experiments

Recent work across mobile development, Android tooling, and AWS.

  1. 01 / 2025

    Build an Expo Application Locally

    Build and sideload a signed Android application for local installation.

    Expo · Android

  2. 02 / 2025

    Set Up an Android Emulator with the Terminal

    Install and run an Android emulator without relying on Android Studio.

    Android · Linux

  3. 03 / 2025

    Set Up AWS Accounts

    A practical starting point for organising AWS accounts and access.

    AWS · Infrastructure

Earlier notes / 2024

Systems and tooling

  1. 01 / 2024

    Connect Two Docker Compose Projects

    Share a development network between separate Compose projects.

    Docker · Networking

  2. 02 / 2024

    Manage Multiple SSH Accounts

    Keep personal and work Git identities separate with SSH configuration.

    Git · SSH

  3. 03 / 2024

    HTML to PDF

    Notes on page breaks, spacing, and footer styling for generated PDFs.

    HTML · PDF

  4. 04 / 2024

    Set Up the Android SDK Without Android Studio

    Install the Android command-line tools and prepare a Linux workstation.

    Android · Linux

Archive / 2023

Deployments and interfaces

  1. 01 / 2023

    Netlify Custom Domain with Namecheap

    Connect a Namecheap domain to a Netlify site with DNS and SSL.

    Netlify · DNS

  2. 02 / 2023

    OpenVPN on Arch Linux

    Connect to an OpenVPN Access Server from an Arch Linux machine.

    Linux · VPN

  3. 03 / 2023

    Horizontal Navigation with White-Space

    Keep navigation links readable when available space becomes limited.

    CSS · Frontend

  4. 04 / 2023

    Deploy AdonisJS with SQLite on Fly.io

    Deploy an AdonisJS application and configure SQLite persistence.

    AdonisJS · Fly.io

Reference notes

My notebook

Shorter references I return to while working.

  1. NOTE 01

    Fundamentals of Circuit Boards

    A personal reference for board markings, multimeters, and safety.

    Hardware · Learning

  2. NOTE 02

    AWS Cheatsheet

    Common AWS CLI commands and service notes.

    AWS · CLI

  3. NOTE 03

    PostgreSQL Cheatsheet

    Reusable queries and patterns for everyday PostgreSQL work.

    SQL · PostgreSQL