A 36-chapter, image-first interactive guide to embedded systems design with ATtiny, ATmega, ESP32, and beyond — the embedded development workflow and toolchain, firmware architecture and interrupts, sensor interfacing and signal conditioning, motor and relay control, PCB and system integration, power design and energy harvesting, wireless connectivity (Wi-Fi, BLE, LoRa), and full sensor-to-cloud system architecture. Every chapter pairs a technical explanation with its own dedicated, full-size diagram slide.
Chapters 1–9 build the foundation: the embedded development workflow, the tools of the trade, and how to choose the right microcontroller for a project. Chapters 10–18 cover firmware architecture, interrupts, state machines, fuse configuration, sensor interfacing, signal conditioning, and driving motors and relays safely. Chapters 19–21 move into PCB layout and multi-board system integration. Chapters 22–27 cover power design end to end — voltage regulation, dual power sources, thermal management, sleep states, and solar energy harvesting. Chapters 28–34 cover wireless connectivity and cloud data flow (Wi-Fi, BLE, LoRa, mesh networking, and OTA firmware updates), and Chapters 35–36 close with a complete real-world system example and a practical troubleshooting flowchart.
Use the Prev / Next buttons at the bottom, or press the arrow keys on your keyboard. Click the ☰ menu button in the top-right to open the table of contents and jump to any chapter. Each chapter's diagram follows immediately after its text as its own dedicated, full-size slide.
Students, hobbyists, and engineers who want a structured, visual path through embedded systems fundamentals — from a first blinking LED through interrupt-driven firmware, sensor interfacing, PCB integration, low-power design, and wireless IoT connectivity — without needing to read a full textbook chapter by chapter.
The guide covers 36 chapters across the full embedded development lifecycle: development workflow and tool selection, firmware architecture and interrupts, sensor interfacing and signal conditioning, motor and relay control, PCB and system integration, power design and energy harvesting, wireless connectivity (Wi-Fi, BLE, LoRa), OTA firmware updates, and a complete real-world system example with a troubleshooting flowchart.
No. The guide uses the ATtiny85 as its primary teaching example because its small pin count and memory force clear design habits, but every concept — architecture, interrupts, power states, wireless connectivity — extends directly to larger parts such as the ATmega328P, ESP32, and ARM Cortex-M microcontrollers.
By structuring firmware around explicit power states — active, a brief communication phase, and deep sleep — so the chip spends the overwhelming majority of its time in a very low-current sleep state and only wakes briefly on a timer or interrupt to sense and transmit data, as covered in the power-states and energy-harvesting chapters.
Wi-Fi offers the highest throughput and direct internet access at the highest power cost and shortest range. BLE offers much lower power draw over a short range, often used for phone-based setup. LoRa trades data rate for multi-kilometer range at low power, ideal for sensor nodes spread across a large outdoor area reporting through a shared gateway.
A DC motor is an inductive load. When the driving transistor switches off, the motor’s collapsing magnetic field generates a brief, high reverse voltage spike. A flyback diode wired across the motor gives that spike a safe path to dissipate instead of destroying the switching transistor — one of the most common first-motor-circuit failures when omitted.
Disclaimer: This guide summarizes general embedded systems and electronics concepts for educational purposes only. Always consult the specific manufacturer datasheet for any real microcontroller, sensor, or component before building a circuit, and follow proper electrical safety precautions when working with live circuits, batteries, and mains-connected loads.