This is a comprehensive guide to understanding and using within the U8g2 library for Arduino and embedded systems.
If built-in fonts are insufficient, you can create or modify them using community tools:
Defines the character range (full, restricted, uppercase, numbers). Size ( 8 ): Indicates the font is primarily 8x8. Selecting the Right U8x8 Font u8x8 fonts
: A classic project, an NTP clock using an ESP8266 or ESP32, can display the time in large, easily readable numbers using U8x8 fonts. The library's efficiency allows the microcontroller to focus on network tasks rather than complex graphics rendering.
The U8x8 library provides several functions for advanced text handling. The draw2x2String() function creates large, blocky text that spans 2x2 character cells—equivalent to 16x16 pixels. This is ideal for displaying large numbers, time values, or prominent status messages. This is a comprehensive guide to understanding and
Because they don't require a large RAM buffer, they are incredibly "cheap" to run on tiny chips like the ATmega328P (Arduino Uno).
are specifically designed for text-based, character-oriented displays where speed and low memory usage are critical. Unlike the pixel-heavy graphics rendering of U8g2, U8x8 deals with characters as 8x8 pixel blocks or their multiples, making it ideal for simple user interfaces. What are U8x8 Fonts? Selecting the Right U8x8 Font : A classic
Here are the most important families:
Standard graphics libraries require a frame buffer in RAM to render shapes and text before pushing them to the screen. U8x8 requires almost no RAM because it writes directly to the display hardware.
U8x8 fonts come with inherent limitations that are important to understand: