Hello.
I want to make a 3D LED display (basicaly a 5x5x5 LED cube).
This display will be controled by a PIC16LF1517 via SPI witch controls 4 * 74HC595 shift registers witch controls some ULN2003A darlington array.
I want a LED to light when i set high 2 pins of shift registers (1 pin for column and 1 pin for layer)
I want to use those darlingtons to drive my LED cube because I dont have any PNP or mosfets. So i plan to use 2 darlington pairs LED anode and one for cathode. Something like in the circuit below (.png file).
So when i set anode driver input high, first darlington will saturate and will set the second darlington base low, allowing the LED to light up if the third darlington base is driven high.
My question is : Is this possible?
The PDF has full PCB schematic.
On J2, pins 2,4,6,8,10 will go to cube layers, witch are common cathodes. the rest will go to cube colums (anodes)
I am new in electronics and this is my first project. Probably the schematic has some glitches..
Sorry if my english is not perfect..