U8x8 Fonts Guide

The fundamental rule is that every character you design must occupy a . Each character is stored as 8 individual bytes, with each byte controlling the state of the 8 pixels in a specific row. The leftmost pixel of the character corresponds to the most significant bit of that byte.

void loop(void) // Your code here

Always start with _r unless you know your display has a specific memory layout quirk.

| Suffix | Name | Description | Best For | | :--- | :--- | :--- | :--- | | | Regular | The standard ASCII set (32-126) and standard Latin-1 characters. | Default usage, English/western text. | | _n | Numbers Only | Contains the digits 0-9, decimal, and maybe a minus sign. | Numeric displays (clocks, counters, measurements). | | _u | u8g2 "Unicode" | Features a broad, user-configurable character range for complete multilingual coverage. | International projects needing full Unicode support. | | _f | Full Range | Provides nearly complete coverage for the target script. | Systems needing extended symbols or more glyphs (font pre-selected by the library author). | u8x8 fonts

This is a fan favorite. It is a clean, modern sans-serif font designed specifically for small OLEDs. It features distinct letters and good contrast.

The beauty of u8x8 fonts is that this rendering math is simple. To draw an 'A' at column 5, row 2, the library simply copies 8 bytes of pre-defined font data to the display's memory at a specific offset. No bit-shifting, no clipping, no complex math.

Unlike standard graphics libraries that look at a screen as individual pixels, U8x8 views the screen as a matrix of tiles. Each tile is exactly . The fundamental rule is that every character you

Contains the complete character set, including uppercase, lowercase, numbers, punctuation, and extended symbols.

Below is an example sketch for an I2C SSD1306 OLED display (128x64 pixels, which creates a grid of 16x8 tiles):

pixels for better visibility at a distance. For even larger resolutions, developers often "cheat" by splitting a single large graphic into four separate tiles and reassembling them on screen. Tools for Customization void loop(void) // Your code here Always start

This uniform grid forces all characters to be , meaning every character on your screen, from a period to a capital "W," takes up the same exact width of 8 pixels. This strict adherence to the 8x8 grid has several key advantages:

U8g2 and U8x8 include hundreds of open-source fonts. To help you navigate them, Oliver Kraus established a strict naming convention. A typical font name looks like this: u8x8_font_chroma48_hf