pcb Driving 10x10 LED matrix with AVR

Posted on Feb 7, 2014

Designing a controller PCB for a 10x10 white LED matrix clock (inspired by the tutorial here ). It`s based off an ATmega328 AVR IC and Maxim DS3234 SPI RTC. However, I`m stuck: I have no idea how to control my custom non-standard 10x10 LED matrix. Originally I was going to use a Maxim MAX7219/7221 IC, but it can only drive 8x8 LED matrices. Then I was looking at some sort of charlieplexing solution with a

pcb Driving 10x10 LED matrix with AVR
Click here to download the full size of the above Circuit.

ULN2803 darlington transistor array. The bright white LEDs I`m using need at least 30mA of current.

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