Arduino
Hi! This is a kid-friendly series I’m writing for my son Anish, who is 11. Every day is a small, self-contained lesson — wire something up, type some code, watch it come alive, and learn one new idea.
No prior coding needed. No prior electronics needed. Just an Arduino Uno kit and some curiosity.
What you will build #
Over 26 days, you go from blinking a tiny light to designing a smart gadget that listens, watches, talks, and moves.
The journey #
Getting started (Days 1–6) — lights, loops, and your first real project
- Day 1 — Meet the Arduino, install the IDE, blink the built-in LED
- Day 2 — Wire up your own LED on a breadboard
- Day 3 — Add a button, make the LED listen to you
- Day 4 — Variables and
forloops — write less, do more - Day 5 — Three LEDs dancing, chasing, and flickering
- Day 6 — Build a real traffic light with a pedestrian button
Making Arduino think (Days 7–10) — inputs, sensors, and decisions
- Day 7 — The easier way to wire a button (
INPUT_PULLUP) - Day 8 — Potentiometer + Serial Monitor + dimming an LED
- Day 9 — Light sensor (LDR) — Arduino sees the world
- Day 10 — Build a Smart Night Light
Movement and sound (Days 11–14) — motors and buzzers
- Day 11 — Buzzer — make noise, then a melody
- Day 12 — Servo motor — rotate to any angle
- Day 13 — DC motor with a transistor and speed control
- Day 14 — Build an Auto Fan that turns on when it is hot
Talking back (Days 15–18) — LCD display
- Day 15 — Hook up a 16×2 LCD and say “Hello Anish!”
- Day 16 — Show live sensor values on the screen
- Day 17 — Build a menu you can scroll through with buttons
- Day 18 — Build a mini Weather Station
Smart control (Days 19–22) — wireless and sound
- Day 19 — Control Arduino with a TV remote (infrared)
- Day 20 — Detect claps with a sound sensor
- Day 21 — Combine IR and sound into dual-mode control
- Day 22 — Build a Smart Room System
Final project (Days 23–26) — design, build, debug, demo
- Day 23 — Pick a project, sketch the system
- Day 24 — Build the core features
- Day 25 — Integrate, debug, and polish
- Day 26 — Demo Day — show it off to family
How to follow along #
Read one day at a time. Each post has:
- What you need (components)
- A circuit diagram showing exactly which pin connects to what
- The full code, copy-pasteable
- Detailed explanation of every new idea
- Challenges to try on your own
Start with Day 1.
Day 2: Blinking an External LED & Understanding the Breadboard
Day 2 of Learn Coding with Arduino — wire up your own LED on a breadboard, learn why resistors matter, and blink it from the Uno.
Day 3: Button Input — Making the Arduino Listen
Day 3 of Learn Coding with Arduino — connect a push button, read it with digitalRead, and use your first if/else to turn on an LED only when pressed.
Day 6: Build a Traffic Light System
Day 6 of Learn Coding with Arduino — build a full red-yellow-green traffic light with realistic timing, then add a pedestrian button that overrides the cycle.
Day 8: Potentiometer, Serial Monitor, and Dimming an LED
Day 8 of Learn Coding with Arduino — your first analog input. Read a potentiometer knob, print numbers to the Serial Monitor, and use PWM to dim an LED smoothly.
Day 10: Project — Smart Night Light
Day 10 of Learn Coding with Arduino — build a smart night light that turns on automatically when it gets dark, with a manual override button.
Day 13: DC Motor, Transistor, and Speed Control
·1403 words·7 mins
Day 13 of Learn Coding with Arduino — drive a DC motor with a transistor and control its speed using PWM. Meet the diode and understand why Arduino can’t power motors directly.
Day 16: Show Sensor Values on the LCD
Day 16 of Learn Coding with Arduino — display live potentiometer and LDR readings on the 16x2 LCD without flicker. Arduino gets a dashboard.
Day 18: Project — Mini Weather Station
Day 18 of Learn Coding with Arduino — build a mini weather station that shows light level, simulated temperature, and custom sun and moon icons on the LCD.
Day 21: Dual-Mode Control — IR Remote + Sound
Day 21 of Learn Coding with Arduino — combine the IR remote and sound sensor into one sketch with manual and auto modes, with the LCD showing the current state.
Day 22: Project — Smart Room System
·1577 words·8 mins
Day 22 of Learn Coding with Arduino — the big one. Build a Smart Room System that combines IR, sound, LCD, light sensor, LED, and buzzer into one coherent program.
Day 26: Demo Day — Show It Off
Day 26 of Learn Coding with Arduino — the final day. You present your project, celebrate the journey, and think about what to build next.