Arduino

Analog and PWM signals

Use a potentiometer to control an indicator, and learn how analog measurements differ from PWM outputs.

Introduction to Arduino

Upload your first sketch, blink the built-in LED, and use Serial Monitor to see what the board is doing.

Using an LED matrix module

Show readable status symbols on a MAX7219 matrix instead of adding a full screen.

Using an analog joystick module

Read a thumb stick, calibrate its resting center, and add a dead zone for stable controls.

Using rotary encoders

Decode a mechanical knob’s direction and count complete quadrature cycles without mistaking every bounce for a turn.

Using an RFID module

Read an RC522 tag identifier with correct voltage translation, and understand why a UID is not a secure key.