tech.raatools/

Aspect Ratios Explained — From Cinema to Social Media

Understand aspect ratios for video, photography, and web design. Learn common ratios like 16:9, 4:3, and 1:1, and how to calculate and convert between them.

Color Theory for Developers — Building Palettes That Work

Learn the fundamentals of color theory, how to pick harmonious color palettes, and why HSL is more intuitive than hex codes. Practical guide for developers and designers.

Understanding Compound Interest — The Math Behind Growing Your Money

Learn how compound interest works with formulas, examples, and visualizations. Understand the difference between simple and compound interest and how contributions accelerate growth.

Cooking Measurement Conversions — Cups, Grams, Ounces and Everything Between

The complete guide to converting between cups, grams, milliliters, ounces, tablespoons and teaspoons for cooking and baking. Includes ingredient-specific conversions.

DNS Records Explained — A, AAAA, CNAME, MX, TXT and More

Learn what DNS records are, how they work, and when to use each type. Covers A, AAAA, CNAME, MX, TXT, NS, SOA, SRV, and CAA records with practical examples.

JWT Tokens Explained — How Authentication Works in Modern Web Apps

Learn how JSON Web Tokens work, what's inside them, how to decode and verify them, and common security pitfalls. Practical guide for developers.

Power Budget for Off-Grid Raspberry Pi Projects

Plan your off-grid Raspberry Pi power system. Calculate total consumption, size batteries and solar panels, and choose the right voltage regulators.

Build a Raspberry Pi LED Matrix with Resistor Networks

Build a multiplexed LED matrix with a Raspberry Pi. Learn resistor calculations, charlieplexing basics, and current management for GPIO-driven displays.

RC Filters and Debouncing for Raspberry Pi GPIO

Use RC circuits to debounce buttons and filter noise on Raspberry Pi GPIO inputs. Covers time constant calculations, component selection, and Python code.

SEO Meta Tags — The Complete Checklist for 2026

Every meta tag your website needs for SEO, social sharing, and search appearance. Includes Open Graph, Twitter Cards, robots directives, and structured data.

Subnet Masks and CIDR Notation — A Practical Networking Guide

Understand subnet masks, CIDR notation, and IP address ranges. Learn to calculate network addresses, broadcast addresses, and host counts with examples.

Text Diff — How File Comparison Algorithms Work

Learn how diff algorithms compare text files, understand unified diff format, and see how tools like git diff work under the hood.

Time Zone Conversions Explained — How to Never Miss a Meeting Again

Learn how time zones work, how to convert between them, and practical tips for scheduling across UTC, EST, CET, JST and more. Includes free online tools.

Typing Speed — What's Fast, What's Average, and How to Improve

Learn about average typing speeds, what WPM means, how typing tests work, and practical tips to type faster. Includes benchmarks for different professions.

Understanding US Federal Income Tax Brackets — How Progressive Taxation Works

Learn how US federal income tax brackets work, why a raise never loses you money, and how to estimate your effective tax rate. Includes 2024 bracket tables.

Wire Gauge & Current Ratings for Raspberry Pi Projects

Choose the right wire gauge for Raspberry Pi power, GPIO, and sensor connections. Covers AWG sizes, current limits, and voltage drop calculations.

Best Apps to Self-Host in 2026 — Raspberry Pi & Homelab

15 best self-hosted apps for Raspberry Pi and homelab in 2026. Replace cloud services with privacy-first alternatives you control.

Build a Portable Raspberry Pi Server

Build a self-contained portable Raspberry Pi server with battery power, SSD storage, and WiFi hotspot. Perfect for off-grid computing, field work, and travel.

Docker Compose Projects for Raspberry Pi — 10 Stacks to Try

10 ready-to-use Docker Compose stacks for Raspberry Pi. Copy-paste configs for media servers, monitoring, development tools, and more.

Home Assistant on Raspberry Pi — Smart Home Without the Cloud

Install Home Assistant on Raspberry Pi to control smart home devices locally. Covers HA OS, Docker install, automations, and Zigbee/Z-Wave setup.

Is a Raspberry Pi Worth It in 2026?

Is a Raspberry Pi still worth buying in 2026? We compare Pi 5 to mini PCs, evaluate pricing, and cover the best use cases where Pi still makes sense.

Jellyfin Media Server on Raspberry Pi — Self-Hosted Streaming

Set up Jellyfin on Raspberry Pi to stream movies, TV shows, and music to all your devices. Covers Docker install, hardware transcoding, and remote access.

Pi-hole Setup Guide — Block Ads on Your Entire Network

Install and configure Pi-hole on Raspberry Pi to block ads and trackers across all devices. Includes Docker setup, custom blocklists, and router configuration.

Raspberry Pi vs VPS for Self-Hosting — Which Should You Choose?

Compare Raspberry Pi and VPS for self-hosting. Covers cost, performance, privacy, maintenance, and which is better for different use cases.

Reverse Proxy with Caddy on Raspberry Pi

Set up Caddy as a reverse proxy on Raspberry Pi with automatic HTTPS. Route multiple services through one domain with subdomains.

Run a Local LLM on Raspberry Pi with Ollama

Run large language models locally on Raspberry Pi using Ollama. Covers installation, model selection, performance benchmarks, and building a private AI chatbot.

Self-Host Nextcloud on Raspberry Pi (Complete Guide)

Set up your own cloud storage with Nextcloud on Raspberry Pi. Covers Docker Compose, MariaDB, SSL with Caddy, and mobile sync.

Solar Powered Home Server — Run 24/7 Off-Grid

Build a solar-powered Raspberry Pi home server that runs 24/7 off-grid. Covers solar panel sizing, battery selection, charge controllers, and power monitoring.

WireGuard VPN on Raspberry Pi — Secure Remote Access

Set up WireGuard VPN on Raspberry Pi for secure remote access to your homelab. Covers both manual install and Docker, with client configs for phone and laptop.

Best Docker Images for Raspberry Pi

A curated list of the best Docker images that run on Raspberry Pi. Covers media servers, ad blockers, dashboards, and more — all ARM-compatible.

Git Server on Raspberry Pi

Set up your own Git server on a Raspberry Pi using Gitea. Includes Docker deployment, SSH access, and backup configuration.

Headless Raspberry Pi Setup — SSH & WiFi Without a Monitor

Set up a Raspberry Pi without a monitor or keyboard. Configure SSH, WiFi, and static IP from your laptop using Raspberry Pi Imager.

How to Install Homebrew on Mac (Apple Silicon) — The Missing Package Manager

Install and use Homebrew on Apple Silicon Macs (M1–M4). Covers setup, PATH configuration, installing packages like nmap, updating, and common troubleshooting.

IoT Monitoring System

Build an IoT monitoring system with a Raspberry Pi. Collect sensor data, visualize it on a dashboard, and set up alerts.

K3s on Raspberry Pi

Install K3s — a lightweight Kubernetes distribution — on your Raspberry Pi. Run containers at scale on minimal hardware.

LED Control with Python

Control LEDs with a Raspberry Pi and Python using GPIO pins. A beginner-friendly electronics project with code examples.

Monitor Raspberry Pi Performance

Monitor your Raspberry Pi's CPU, memory, temperature, and disk usage. Covers htop, vcgencmd, Netdata, and Prometheus.

Node.js on Raspberry Pi (Performance Test)

Benchmark Node.js performance on Raspberry Pi models. Includes HTTP throughput, startup time, and memory usage tests.

Optimize SD Card Performance

Speed up your Raspberry Pi by optimizing SD card performance. Covers filesystem tuning, swap, log reduction, and SSD migration.

Python Flask App on Raspberry Pi

Deploy a Python Flask web app on your Raspberry Pi. Covers Gunicorn, Nginx reverse proxy, and systemd service setup.

Raspberry Pi CI/CD Server

Turn your Raspberry Pi into a CI/CD server using Drone CI or Woodpecker. Automate builds and deployments from Git pushes.

Raspberry Pi Cluster Setup (Kubernetes)

Build a Raspberry Pi cluster running Kubernetes. Step-by-step guide covering networking, K3s install, and multi-node workloads.

How to Install Docker on Raspberry Pi (Step-by-Step)

Complete guide to installing and configuring Docker and Docker Compose on Raspberry Pi OS. Includes post-install steps, Portainer setup, and common troubleshooting.

Turn Your Raspberry Pi into a Home Server (Complete Guide)

Step-by-step guide to building a Raspberry Pi home server with Docker. Run Pi-hole, Nextcloud, Jellyfin, Vaultwarden, and more.

Raspberry Pi Overclocking Guide

Safely overclock your Raspberry Pi 4 or 5 for better performance. Covers config.txt settings, cooling, and stability testing.

Powering a Raspberry Pi with Solar (Beginner Guide)

How to run a Raspberry Pi on solar power. Covers panel sizing, battery selection, charge controllers, and a complete wiring guide with real power measurements.

Raspberry Pi vs Mini PC for Your Homelab — Power, Performance & Cost

Raspberry Pi or mini PC for your off-grid homelab? We compare power draw, performance, Docker compatibility, and cost to help you pick the right hardware.

Run AI Models on Raspberry Pi

Run AI and machine learning models on a Raspberry Pi using TensorFlow Lite, ONNX Runtime, and llama.cpp. Includes benchmarks.

Run Docker Compose on Raspberry Pi

Use Docker Compose to manage multi-container services on your Raspberry Pi. Covers compose files, networking, volumes, and updates.

Smart Doorbell with Camera

Build a smart doorbell with a Raspberry Pi and camera module. Includes motion detection, notifications, and video recording.

Smart Home Automation with Raspberry Pi

Automate your home with a Raspberry Pi running Home Assistant. Control lights, sensors, and devices from a single dashboard.

Temperature Sensor Dashboard

Build a temperature monitoring dashboard with a Raspberry Pi and DHT22 sensor. Visualize data with Grafana and InfluxDB.

TensorFlow Lite Setup Guide

Install and configure TensorFlow Lite on a Raspberry Pi for on-device machine learning inference. Includes image classification example.

Voice Assistant on Raspberry Pi

Build a private voice assistant on a Raspberry Pi using open-source tools. No cloud services required — everything runs locally.

VS Code Remote Development with Pi

Use VS Code Remote SSH to develop directly on your Raspberry Pi from your laptop. Covers setup, extensions, and performance tips.

Web Dashboard for Raspberry Pi

Create a web dashboard for your Raspberry Pi homelab using Homer or Dashy. Monitor all your self-hosted services in one place.

What Is an Off-Grid Homelab? (And Why You'd Want One)

An off-grid homelab runs your own servers and services without relying on the grid or the cloud. Here's what that means, why it matters, and what you need to build one.