First edition came out in October 2023. Three years of building shit — AkiraOS, KeyaPad, a pile of custom PCBs, a lab (pen.engineering), a lot of hard faults and a few production boards later — I can see everywhere I was wrong, everywhere I was lazy, and everywhere I left stuff out because I didn't know it yet.
This edition fixes that. New chapters on DSP, wireless (BLE / WiFi / LoRa / SubGHz / NFC / MQTT / Zigbee / Z-Wave), RTOS and Embedded Linux — and the old chapters got a haircut and a full rewrite. Drawings are redone. Code is checked. War stories are real. This is what I wish I had when I started.
Same rule as the first edition: you will have to Google things. Googling is a skill. Reading datasheets is a skill. Breaking things and fixing them at 3AM is a skill. This book is the scaffolding — the rest is on you.
“KISS — Keep It Stupid Simple. And refactor every 2-4 sprints so you don't want to set your repo on fire six months later.” — Artur