MAX7219 matrix display smaller “font”

[kuzm1nsk1]

Hello, I’m using Arduino Uno to interface MAX7219 8x8 dot matrix display with 4 modules. Can someone reccomend a way to fit 6 digits on 4 modules that would display clock as for example 12 : 34 : 56. The default “font” using MAX7219 or parola library is to big and I can’t find a way to size it without writing my own code from the beginning.

[Nominal Animal]

Hello, I’m using Arduino Uno to interface MAX7219 8x8 dot matrix display with 4 modules. Can someone reccomend a way to fit 6 digits on 4 modules that would display clock as for example 12 : 34 : 56. The default “font” using MAX7219 or parola library is to big and I can’t find a way to size it without writing my own code from the beginning.

See https://arduinoplusplus.wordpress.com/2016/11/08/parola-fonts-a-to-z-defining-fonts/.

You have 32 LEDs horizontally.  I'd use

Code: [Select]

H H H · h h h h · · · M M M M · m m m m · · · S S S S · s s s s      1 = 0x01
H H H · h h h h · · · M M M M · m m m m · · · S S S S · s s s s      2 = 0x02
H H H · h h h h · X · M M M M · m m m m · x · S S S S · s s s s      4 = 0x04
H H H · h h h h · · · M M M M · m m m m · · · S S S S · s s s s      8 = 0x08
H H H · h h h h · · · M M M M · m m m m · · · S S S S · s s s s     16 = 0x10
H H H · h h h h · X · M M M M · m m m m · x · S S S S · s s s s     32 = 0x20
H H H · h h h h · · · M M M M · m m m m · · · S S S S · s s s s     64 = 0x40
H H H · h h h h · · · M M M M · m m m m · · · S S S S · s s s s    128 = 0x80
The data displayed on the four MAX7219 modules is formed from 32 bytes, each byte defining one (vertical) column of LEDs.  Each LED corresponds to a binary digit, the values shown above on right.

You essentially need five 8×3 glyphs –– space, ':', '0', '1', '2' –– and eleven 8×4 glyphs –– space, and '0' through '9'.  You need to draw these yourself, I'm afraid.