Learn Arduino

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1. Meet the board — The Arduino Uno is a popular microcontroller board based on the ATmega328P.
2. Blink an LED — Your first circuit: an LED and a resistor on a breadboard, driven by pin 13.
3. Push a button — Inputs let the board sense the world.
4. Turn a knob — A potentiometer is a resistor with a slider.
5. Mix colours — An RGB LED is three LEDs — red, green and blue — under one milky lens.
6. Sense light — A light-dependent resistor (LDR) conducts better the more light falls on it.
7. Read a sensor — The HC-SR04 sends out a burst of ultrasound and listens for the echo.
8. Make a sound — A piezo buzzer clicks every time its pin flips.
9. Mini piano — Eight keys and a buzzer make a piano you can play.
10. Control a motor — A pin can’t power a motor on its own, so a transistor does the heavy lifting.
11. Sense heat — The TMP36 turns temperature into a voltage: 0.5 V at 0 °C and 10 mV more for every degree.
12. Sweep a servo — A servo is a motor that knows where it is.
13. Spin the wheel — A stepper motor turns in exact steps — 2048 make one full turn of this one.
14. Smart plant — A capacitive sensor in the soil says how wet it is, and a little OLED screen turns that into a percentage and a mood.
15. Feel the force — A force-sensing resistor (FSR) is a thin pad whose resistance falls from millions of ohms to a few hundred as you press it.
16. Build a project — Put it all together: the distance sensor watches the obstacle and a traffic light tells the driver when to stop.

Learn Arduino

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