Cool Hardware

Here is the truth about cool hardware: the best gadgets are the ones that make you understand computing better, not the ones that merely look clever on a desk. A blinking LED you wired yourself beats a sealed plastic brick you can’t open.

What it is, in plain words

This page is a living shelf of hardware worth knowing if you like to tinker: small computers, microcontrollers, unusual keyboards, radios, and tools that sit at the boundary between software and electrons. It is not a buying guide for the latest phone. It is a list of things that teach.

Why it matters

Software is invisible. Hardware makes it physical – voltages, timing, antennas, motors. Spending time here improves every other layer: suddenly interrupts, buffers, baud rates and power draw stop being abstract. It is also fun, and fun is a legitimate reason to learn.

An everyday analogy: a kitchen versus meal kits

A meal kit is convenient and closed. A kitchen with knives, a stove and raw ingredients lets you cook anything and understand cooking. Cool hardware is kitchen equipment for computation.

A hands-on shelf (2026)

Single-board computers

Raspberry Pi 5 – the default small Linux computer; GPIO, NVMe via hat, great docs.
Orange Pi / Rock 5 / Radxa – often more performance per pound; check Linux support before you buy.
Framework Laptop mainboards – repairable, modular; a statement that hardware can be owned.

Microcontrollers

Raspberry Pi Pico 2 (RP2350) – dual-core, cheap, MicroPython/C/Rust.
ESP32-C6 / C3 – Wi-Fi and Thread/Zigbee on a few dollars; Home Assistant’s friend.
STM32 “blue/black pills” – denser ARM Cortex-M ecosystem; steeper but deep.

Keyboards and input

Something QMK/ZMK-powered (keycaps you flash yourself).
Penti hardware or a hand wired chord board.
A trackball (Kensington / Ploopy) – saves the desk and the shoulder when used with a tiling WM.

Radio and sensing

RTL-SDR dongle – turn a laptop into a radio receiver; ADS-B planes, weather satellites, pager noise.
Flipper Zero – controversial toy/tool for proximity protocols; educational if used ethically and legally.
A basic logic analyser (Saleae or a cheap clone) – once you see I²C on a screen, buses make sense.

Tools that pay for themselves

A decent soldering iron (Pinecil, TS101) and solder braid.
Dupont wires, a breadboard, a USB power meter.
A USB-UART adapter (CP2102 / CH340) – console into routers and headless boards.

A first afternoon project

Buy a Pico, flash MicroPython, blink an LED, then read a button. When that works, read a BME280 over I²C and print temperature to the serial console. You have just done GPIO, buses and sensors – the same ideas inside every “real” system.

# on the Pico, with MicroPython REPL via serial
>>> from machine import Pin
>>> led = Pin(25, Pin.OUT)
>>> led.toggle()

Buying without regret

Prefer vendors who publish schematics or at least pinouts.
Check the Linux kernel and distro support matrix before the board arrives.
Budget for a good power supply; cheap ones cause “mysterious” SD corruption.
Start with one ecosystem (Pico or ESP32 or Pi) and go deep before spreading out.

Common misconceptions

“More specs = cooler.” Support, documentation and community matter more than GHz.
“Hardware is expensive.” A Pico and a bag of LEDs cost less than lunch.
“You need an EE degree.” You need curiosity and respect for voltage limits (3.3 V ≠ 5 V).
“Wireless is magic.” RF is physics; SDRs and antenna length demystify it.
“Modding voids everything that matters.” On open hardware, modding is the point. On sealed products, check legality and safety (batteries especially).

Connections

Raspberry Pi, Penti, Keyboard Config.
Linux, Assembly Language.
ICS Security – when things that move meet networks.

Radio Stuff

MFJ-886B FREQUENCY COUNTER, .3 MHZ TO 2.8 GHZ, 110/220VAC
Kaltman Creations HF4060 RF Spectrum Analyzer.
Alfa AWUS051NH 500mW High Gain 802.11a/b/g/n high power Wireless USB