Hi,
I would like to know how many leds i can use with the arduino card. I need to control 441 leds. What is the max current that the card can admit ?
JB
Yes, have already seen that. And it doesnt answer my question. There is a max of 40 mA per I/O but... is that possible to give enough power to hundreds of leds and control them with the board :
http://www.arduino.cc/en/Tutorial/LEDDriver -> here 8 led = 20 mA * 8
I understand something wrong i'm sure...
unlimited i'd say, becuase you could always use external power to power the shift registers or the max chips, it doesent all have to connect to the arduino, make a little 5v circuit, and go from there
800ma max for the on board regulator.
You can provide power to the LEDs from an external supply.
To control 441 you'd probably want to use an 8x8 matrix IC and to use 7 of them
that would get you 448.
If each LED is drawing 20ma that's 8.96 AMPS, granted they will be strobing and you can dim them down but you need a pretty substantial power supply to drive them.
There is a practical limit to what the arduino can do. You can however design an 8x8 matrix and get it working as a proof of concept. Then use a barebones arduino that has only what you need to control a single matrix and use it to control each group of 64 LEDs. Then a master Arduino would tell them what to do and you would tell the master what to do using any number of inputs including a computer.
Hi, modjibe
There are several solutions for this on the arduino playground :
http://www.arduino.cc/playground/Main/LEDMatrix
Eberhard
and have a look at the links in this thread: http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1199687953