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Putting "Smart" Into Smart Devices: Enter the World of Microcontrollers With WiFi and Bluetooth. Learn to Build Your Own Smart Devices Using Off-The-Shelf Components

This post is not a comprehensive dive into the world of microcontrollers, but rather a brief introduction and a compilation of interesting facts I've collected over the months working on a couple projects that made use of contemporary microcontrollers to achieve real and practical goals.

The Harsh Reality of Reality

I'm sure you're well aware of the situation with microelectronics prices. It's been getting worse for a couple years and doesn't look like it will improve any time soon due to the on-going crisis in several areas at once: semi-conductor component shortages, logistics issues, political games, socioeconomic factors and everything in between. For an average technically-minded person this means that one must look for creative ways to achieve their goals or alter those altogether.

We do live in the real world after all, and one must adapt or perish.


Remember "low-cost single-board PCs" we eagerly watched evolve and get cheaper over the years? All of those Raspberry/Orange/Rock Pi's and "Zeros", Tinker boards and Jetson Nanos? Oh they did evolve all rightInto overpriced 100+ USD boards. So now we're stuck in a reality where even the simplest single-board ARM PC in the form of a Pi Zero W is valued at 100 USD instead of expected $15-20.


So… What Do?

There are practical alternatives to single-board PCs:

  • Small x86/x64 PCs
  • Microcontrollers

The first option is blatantly obvious if you're looking for a device with a real multitasking OS and a load of compute power. And used PCs nowadays? They are cheap. For a market price of about $150 for a Raspberry Pi 4 with 4GB RAM you can get a used mini-PC with a 4-core Pentium/Celeron CPU, 4 to 8 gigs of extendable RAM and a 128GB+ SSD system drive with an option of connecting a second drive via SATA or M.2.


Almost any PC will blow a Pi out of the water performance-wise. Sure, small PCs can't beat Pi boards' dimensions, power consumption and embedded IO-capabilities with over 20 I/O pins exposed for communicating with external devices. So if you're looking to set up a home web/file server, retro emulation station or use the machine as a simple desktop PC, opting for a used mini-PC today would be a no-brainer.

But what if you actually require rich I/O capabilities, small dimensions and low power-drain of a small single-board device?

Enter… Microcontrollers!

Upcoming Blog Post — Microcontrollers!

The full post is available now.

Not much to see here but a short announcement of the upcoming post about microcontrollers.

I've been dying to take a deep dive into this topic ever since I built my first PC, but was scared away by the complexly of both the programming and the hardware aspects of the whole endeavor. And now, 15+ years later, I finally built up some courage to try and program one of those and it turned out to be an incredible and very, very straightforward and rewarding experience! What helped motivate me to finally bite the bullet was the worsening availability of semiconductors and the price hike on almost all electronic components and devices that followed suit.

Microcontroller on a breadboard

What must have also contributed was another project of mine where I modded a Panasonic RX-DT75 by adding audio over Bluetooth support via a new a voltage regulator with USB-level output, to which a Bluetooth USB module was then connected to gift this machine a new lease on life as a useful appliance and not just a relic of the past collecting dust on a shelf.

Panasonic RX-DT75 Bluetooth Mod

But boy would it still make one gorgeous dust-collector regardless!

Panasonic RX-DT75

Anyway, back to work!