* LEDBrightnessUP(); is a function to increase the LED brightness. * The address of the GainDelay variable is passed to it via a pointer * in order to delay the control slightly via the value stored ...

LedControl is an Arduino library for MAX7219 and MAX7221 Led display drivers. The code also works with the Teensy (3.1) Modified by Jack Zimmermann for supporting hardware SPI using the predefined ...