05·Build, integration and debugging over Serial

Introduction

From schematic to a working prototype on a breadboard: transferring connections, a common GND for all modules, and power. Incremental integration — adding and testing one module at a time. Serial as the main debugging tool on Arduino: Serial.begin, Serial.print/println, baud rate matching, printing variables and readings. Diagnosing common symptoms (garbage, resets, zeros from a sensor) and techniques for isolating a problem.