Larger fonts on SSD1306 OLED displays

[pythoncoder]

You need to use font_to_py.py with the -x option to create horizontally mapped fonts. This shows the options

Code: Select all

$ font_to_py.py --help

[IHOXOHI]

PERFECT.

So good.

All my respect.
All the best.

[IHOXOHI]

Yip,

It works too with an epaper!

WONDERFULL!!!

Thanks.

[volkerjaenisch]

Really cool software!

[l00p1n6]

If someone is still interested in this topic, here is a solution I came up with....

NB: I am using ESP32-WROOM-32, 0.91" OLED 128x32

Code: Select all

from machine import SoftI2C, Pin
import time
import ssd1306

OLED_SCL_PIN = 22  # clock
OLED_SDA_PIN = 21  # data
OLED_WIDTH = 128  # pixels
OLED_HEIGHT = 32  # pixels


def oled_text_scaled(oled, text, x, y, scale, character_width=8, character_height=8):
    # temporary buffer for the text
    width = character_width * len(text)
    height = character_height
    temp_buf = bytearray(width * height)
    temp_fb = ssd1306.framebuf.FrameBuffer(temp_buf, width, height, ssd1306.framebuf.MONO_VLSB)

    # write text to the temporary framebuffer
    temp_fb.text(text, 0, 0, 1)

    # scale and write to the display
    for i in range(width):
        for j in range(height):
            pixel = temp_fb.pixel(i, j)
            if pixel:  # If the pixel is set, draw a larger rectangle
                oled.fill_rect(x + i * scale, y + j * scale, scale, scale, 1)


def main():
    i2c = SoftI2C(scl=Pin(OLED_SCL_PIN), sda=Pin(OLED_SDA_PIN))
    oled = ssd1306.SSD1306_I2C(OLED_WIDTH, OLED_HEIGHT, i2c)

    # no scaling
    oled.fill(0)
    oled.text("ABCDEFGHIJKLMNOP", 0, 0)
    oled.text("abcdefghijklmnop", 0, 8)
    oled.text("0123456789012345", 0, 16)
    oled.text("=!\"#$%&/()?-+*:;", 0, 24)
    oled.show()
    time.sleep(3)

    # 2x
    oled.fill(0)
    oled_text_scaled(oled, "ABCDEFGH", 0, 0, 2)
    oled_text_scaled(oled, "abcdefgh", 0, 16, 2)
    oled.show()
    time.sleep(3)

    # 4x
    oled.fill(0)
    oled_text_scaled(oled, "ABCD", 0, 0, 4)
    oled.show()
    time.sleep(3)


if __name__ == "__main__":
    main()

[davef]

I suggest posting this here:
https://github.com/orgs/micropython/dis ... w-and-tell

[l00p1n6]

I suggest posting this here:
https://github.com/orgs/micropython/dis ... w-and-tell

Done, do you want me to remove the previous post's content and just put a link to the solution on GitHub?

[davef]

I'd leave it and then that gives two opportunities to find it. Will try your code as reading standard fonts on these OLEDs is difficult.

[l00p1n6]

I'd leave it and then that gives two opportunities to find it. Will try your code as reading standard fonts on these OLEDs is difficult.

Should be readable at 4x scale

Link to image (cannot embed):
https://ibb.co/XyP2fBY