high power LED matrix; is it possible and how?

I've been getting into arduino lately and recently discovered the LED matrix.  I also saw some high power LEDs controlled by arduino using transistors to handle the power.  I wondered if the same idea could be applied to a matrix.  It seemed relatively simple, but when I built the circuit in a simulator (everycircuit- an excellent app), I quickly realized some issues with it.  The attached picture is the circuit in the simulator.  You should get an idea of the flaws of the circuit.  I know it would be pretty simple to use relays instead of transistors, but does anyone have any ideas on how to do it with transistors?  NPN or PNP or both.  I can't figure it out how to do it, but I figured that the collective mind of the brilliant members of instructables could probably manage to come up with something.

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You want something like this:


Or this:


All that is left is the code implementation into your arduino and connecting the LED's (to put it simple).

dudes (author)  Downunder35m2 years ago

Those would probably work, except that the LEDs I would use are 350 mA. I also just want to be able to build the circuit itself (more fun)

You can still use the IC and transistors to get the power levels you want.

Main problem is you need to address the lights and using a dedicated chip makes this much easier.

Think of 8 bit digital, it gives you 256 posiible combinations with 8 data lines.

3 data lines give still 16 combinations.

Just as a hint for manual labour ;)

dudes (author)  Downunder35m2 years ago

Yeah, I may end up using one of those, but I would like to do it without ICs or microcontrollers.

caitlinsdad2 years ago

You would need someone more familiar with multiplexing to comment but there are chips out there to handle the functionality to drive the matrix and to power the LEDs. In your matrix design, I think there are some backvoltages to consider which might be mitigated by use of diodes.

dudes (author) 2 years ago

Oops, I guess the picture didn't upload the first time. Hope it works this time.