NeoPixel is Adafruit’s name for addressable RGB (or RGBW) LED products—most commonly based on the WS2812/WS2812B (and similar) LED chips—that you can control with an Arduino using one data pin . Wiring 5V (or 3.3V on some strips) to the strip’s +V GND to GND (Arduino and LED power supply grounds must be connected) DIN (data-in) to an Arduino digital pin (often through a ~330–470 Ω resistor) Common color orders: NEO_RGB - Red, Green, Blue (in that order) NEO_GRB - Green, Red, Blue (most...

Arduino PS2 controller An Arduino PS2 controller setup lets an Arduino read button presses and analog sticks from a PlayStation 2 (PS2) gamepad using a PS2 gamepad interface library (commonly PS2X / PS2X_lib ). The controller communicates over a simple synchronous serial link (PS2’s SPI-like protocol): the Arduino provides the clock and commands, the controller returns data, and a “select/attention” line activates communication. Pins: DAT (Data out) → Arduino input (MISO-like) 13 CMD...

OLED Display What it is: A small screen that displays text, graphics, or simple animations. OLED = Organic Light-Emitting Diode. Pins: VCC/VDD - Power (3.3V or 5V) GND - Ground SCL - Clock signal (for I2C communication) SDA - Data signal (for I2C communication) Use case: Display sensor readings, status messages, menus, or simple graphics. I2C (Inter-Integrated Circuit) What it is: A communication protocol that allows multiple devices to talk to a microcontroller using only 2 wires. How...