I also have an ldr attached to an analog pin on the Arduino, for every '7219 project I've done so far, so I can set the display brightness based on ambient light levels. So the average led current will be less still, except in bright conditions.
I also have an ldr attached to an analog pin on the Arduino, for every '7219 project I've done so far, so I can set the display brightness based on ambient light levels. So the average led current will be less still, except in bright conditions.