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Arduino · Module 7 of 10

Libraries, displays and modules

Extend Arduino with libraries and modules.

📖 Key ideas

  1. Install libraries via Library Manager.
  2. Displays: 16×2 LCD (I2C), OLED (SSD1306), 7-segment.
  3. Modules: ultrasonic HC-SR04, PIR, RFID RC522, GPS, Bluetooth HC-05.
  4. Libraries hide complex protocols.
  5. Read datasheets and example sketches.
💡 Real-life example: Libraries are ready-made recipes; you add ingredients (pins) and cook instantly.
LibraryReusable code package
I2C LCDDisplay using two wires
HC-SR04Ultrasonic distance sensor
RFIDRadio frequency identification