A hands-on course
Understanding circuits well enough to build your own home-automation gadgets — with intuition, not heavy math.
Short lessons, each with one concrete win, built on trusted sources and the water-pipe way of thinking about electricity. Read them in order; come back to the glossary any time.
Voltage, current, and resistance — and why your LED needs that resistor.
A schematic is a map — and how to lay it down on real breadboard holes.
Predict what a circuit does at a glance — no math, just two patterns.
3.3V vs 5V, pin current limits, common ground — how not to fry your board.
The floating-pin trap, and pull-up/pull-down resistors that fix it.
The transistor as a switch, and the flyback diode that protects it.
The home-automation payoff — with safety front and center.
Read values & ratings, and meet the voltage divider.
Types, polarity, and the decoupling-cap habit that fixes flaky projects.
A knob your board can read — your first analog input.
One-way-valve tricks: flyback and reverse-polarity protection.
Orient any chip and look up exactly how to use it.
What's on your board, and Arduino vs ESP32.
The three ways a pin talks — and the PWM trick.
Connect almost any sensor or display module.
Spin a motor both directions and control its speed, safely.
Precise position and repeatable motion control.
Turn temperature, light, and motion into signals — closing the loop.
Glossary → Symbol cheat-sheet → Component field guide → Signals & buses → Rules of thumb →