Learn Embedded Systems & C, One Tutorial at a Time

Practical tutorials covering computer architecture and embedded C, written for people who want to understand what's actually happening on the hardware, not just copy code.

Start with Computer Architecture Explore Embedded C

Latest Tutorials

A growing library of tutorials, starting with how computers are actually organized under the hood.

Diagram showing the CPU connected via a system bus to RAM, storage, and I/O devices Computer Architecture

What Is Computer Architecture? A Beginner's Guide

Computer architecture explains how the CPU, memory, and I/O work together. Learn the core concepts, real examples, and why these design choices matter.

 Embedded C sits between standard C and the hardware registers it controls directly Embedded C

What Is Embedded C? A Complete Guide

Embedded C adds direct hardware control to standard C. Learn what makes it different, its core features, and how it actually looks in a real program.

 Hardware, firmware, and software as dependent layers, hardware at the bottom Computer Architecture

Hardware, Software, and Firmware Explained

Hardware, software, and firmware get confused constantly. Here's what each means, how they work together, and real examples from devices you use daily.

 C runs on an OS with large memory; Embedded C runs bare-metal on a microcontroller with tight memory Embedded C

C vs. Embedded C: What Actually Changes

Same language, different job. See exactly how memory, hardware access, and execution environment separate ordinary C from Embedded C, with real code.

 Diagram showing data flow between input, CPU, output, RAM, and storage Computer Architecture

The Basic Building Blocks of a Computer

Every computer, no matter how small, is built from the same four parts: CPU, memory, storage, and I/O. Here is what each one actually does, with real examples.

 Diagram showing the Control Unit, ALU, and Registers inside a CPU Computer Architecture

What Is a CPU? How It Works

A CPU fetches, decodes, and executes instructions using three internal parts: the control unit, the ALU, and registers. Here is how each one works.

 Von Neumann's shared bus makes instructions and data take turns; Harvard's separate buses let both move at once Computer Architecture

Von Neumann vs. Harvard Architecture

Both models solve the same problem differently: how the CPU reaches instructions and data. Here is the trade-off, real chip examples, and how to choose.

 RAM and ROM do the same job (storing bits) with opposite trade-offs Computer Architecture

RAM vs. ROM: What's the Difference?

RAM and ROM both store bits but solve opposite problems: one is fast and volatile, the other survives power loss. Here is how each works and where they fit.

 L1 is smallest and fastest, L3 is largest and slowest, DRAM sits below all three Computer Architecture

CPU Cache Memory Explained

CPU cache bridges the memory wall between fast processors and slow DRAM. Learn the L1/L2/L3 hierarchy, write policies, and how to measure cache performance.

 MESI's four states: Modified, Exclusive, Shared, and Invalid Computer Architecture

Cache Coherence Explained

When multiple CPU cores each cache the same memory, something has to keep them in sync. Learn snooping vs. directory protocols and the MESI state machine.

 Every step down the hierarchy trades speed and cost per bit for capacity Computer Architecture

The Memory Hierarchy: Why Computers Use Different Memory Types

Registers, cache, RAM, and storage each trade speed and cost per bit for capacity. Learn the transistor-level economics behind why this hierarchy exists.

Why EmbeddedTechLearn

Most tutorials show you what to type. We explain why it works.

Hardware-First Explanations

We connect the C code back to what the microcontroller is actually doing at the register level.

No Fluff

Clear, dense, practical writing, no padding just to hit a word count.