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The OLED has no letters built in. The GFX library paints each character as a tiny pattern of pixels, so you control exactly how text looks. ✍️

On a monochrome OLED, color means on or off. Call setTextColor with WHITE so your letters light up against the dark background.

setTextSize(1) draws the base 6x8 pixel font. Larger numbers scale that same shape up, trading sharpness for readability from a distance.

Size 2 doubles every pixel, so a letter becomes 12x16. Size is a whole-number multiplier, not a point value, so jumps are chunky but predictable.

setCursor(x, y) sets where the next text starts. The top-left corner is (0,0), and x grows right while y grows down the screen.

Now write words with print or println. They behave like the Serial Monitor, but the output lands on your OLED at the cursor.

You can pass variables straight to print. Mix labels and values to show live data like a temperature reading right on the screen.

Combine a big title with small details below. Use size 2 for a headline, then drop back to size 1 for the data lines underneath.

The cursor does not auto-wrap nicely for layouts. For a clean second line, call setCursor again with a larger y value to drop down.

Remember the rhythm: clearDisplay, set size and cursor, print, then display. Skip the final display and your fresh text never shows up.

Big text eats space fast. A size-2 line is 16 pixels tall, so on a 64-pixel screen you fit only a few rows before running off the bottom.

You want letters twice as tall as the default font.

You set color, chose a text size, positioned the cursor, and printed labels with values. Headlines big, data small, always end with display.