C-tech — Introduction to LCD and I2C Communication + 5 more topics

LCDs are great for displaying information in your projects. Traditionally, connecting a standard 16x2 LCD (16 characters, 2 lines) directly to a microcontroller requires many wires – typically 6 data lines, plus power and control lines. This can quickly use up valuable pins on your microcontroller.

Wyświetlacze LCD są świetne do pokazywania informacji z Twojego projektu Arduino. Tradycyjne wyświetlacze LCD (jak 16x2) wymagają wielu pinów do podłączenia do Arduino (często 6 lub więcej), co może być problemem, jeśli masz już dużo innych komponentów. Moduł I2C (Inter-Integrated Circuit) rozwiązuje ten problem, redukując liczbę potrzebnych połączeń do zaledwie czterech.

To program an I2C LCD with your Arduino, you first need to prepare your Arduino IDE. This involves two main steps: installing the necessary library and ensuring your board is correctly selected.

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Here's how the basic communication flow works:

Most Arduino libraries (like LiquidCrystal_I2C) abstract away the low-level I2C communication. You'll primarily interact with functions that map directly to common LCD actions.

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To program an I2C LCD with your Arduino, you need to perform three main setup steps within the Arduino IDE.

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When working with LCDs, especially character LCDs or small graphical LCDs, you often interact with them through a specific set of commands and data. While libraries abstract this away, understanding the underlying direct control offers significant advantages in speed and flexibility.