Beginner

Arduino tone() and Piezo Buzzer: Notes, Wiring, Full Code

Build a playable electronic piano with an Arduino UNO R4 and a passive piezo buzzer. Complete with a note-to-frequency table, circuit diagram, annotated code, demo videos, and an FAQ covering the usual pitfalls — finished in about an hour.

Ohm's Law LED Resistor Calculation for Arduino Beginners

Learn how to safely light up an LED using Ohm’s Law. Calculate the correct resistor value, wire a breadboard circuit, and avoid common mistakes — a complete beginner’s guide.