Series
Electronics Basics
Breadboards, resistors, capacitors, timers and displays — the parts every project is built from.
What Is a Decoupling Capacitor? (Values, Placement, and Why Your Chip Resets Without One)
A decoupling capacitor is a tiny local battery beside a chip's power pin. Why 100 nF, why it must sit close to the pin, which leg goes to ground, decoupling vs bypass.
17 Nov 2026
How a 7-Segment Display Works: Eight LEDs, One Shared Pin
A 7-segment display is eight LEDs sharing one pin. Common anode vs common cathode, which segments make each digit, resistor values, and Arduino code.
14 Nov 2026
How the 555 Timer Works: Three Resistors, Two Thirds, One Capacitor
Inside the 555: three resistors set ⅓ and ⅔ thresholds, two comparators watch a capacitor, a flip-flop makes it blink. Astable and monostable, with formulas.
13 Nov 2026
Button Debouncing Explained: Why One Press Counts as Three (and How to Fix It)
Mechanical switches bounce for a few milliseconds every press. Here's what that looks like on a scope, and three ways to debounce: a delay, millis(), and an RC filter.
12 Nov 2026
What Does a Pull-Up Resistor Do? (And Why Your Button Reads Random Values Without One)
A pull-up resistor gives an input pin a definite voltage when nothing drives it. Why a floating pin reads garbage, what value to use, and pull-up vs pull-down.
11 Nov 2026