there is a 5v pin on the arduino between the GND and 3.3v pins, are you saying that I should connect the 5v pin on the max7219 to that pin? in that case , I would just need to supply all of my power through the arduino, correct? and am I also correct in assuming that I could use the power jack to provide 8v 1 amp of power to the arduino and it should all work? I am unaware of how many amps the 5v pin on the arduino can handle.
OK, and if I split a 1 amp supply parrallely to two circuits, they won't each get .5 amps? because if the current just divides itself equally, I will provide too much current to the arduino. I would need .5 amps to the arduino and about 1 amp to the LEDs. On an unrelated note, I used to live in Goodrich, just south of Grand blanc! small world haha!
Alright, so the 5v can just be plugged into the Vin port on my arduino Uno? and the same line can also be plugged into the max7219's? then that makes sense. and the arduino will only draw as much current as it needs since I will be using a 5v 1.2 amp transformer. the Led's will draw as much current as they need and the current that is not used will dissipate as heat, in the wall wart? OR thereabouts. OK. the max7219 schematic says that I need two capacitors also, and the internet cant seem to tell me a specific type of capacitor to get. Do I need a specific type? Thanks again! and I moved last July, but I'll always remember the martians!