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Topic: 8x8x8 multiplexed LED cube with an Arduino Mega 2560 (Read 41 times) previous topic - next topic

Un4Seen

I have a really basic, but important question. The Arduino has some pins marked 5V and GND. See the group of pins which is leftmost on the bottom of the following image:



My question is: Are those 5V/GND pins directly connected to the power jack of the Arduino or the current passes through some circuitry in the Arduino before it reaches the 5V and GND pins? I'm asking because I want to determine whether I can feed my LED Cube Driver circuit from these 5V/GND pins of the arduino or I need to connect my LED Cube Driver to the real power supply's 5V and GND. As you know, my LED Driver Circuit can work with currents up to 1.3A and I'm wondering if it's safe to take that much current from the Arduino's 5V/GND pins...
It would be nice if I could feed my custom circuit from the 5V/GND pins of the Arduino because that way I would have only one power connector (on the Arduino), I would only need to solder some pin headers on my own custom circuit.

Thanks!

Hippynerd

Im not sure about the mega, but the 328 based units seem to be limited to 500ma at the 5v pin. My guess is that 1.3a is going to too much, even for the mega.  I think that the 5v pin limit is from the specific voltage regulator that is used (the part right next to the external power socket.)



retrolefty


Im not sure about the mega, but the 328 based units seem to be limited to 500ma at the 5v pin. My guess is that 1.3a is going to too much, even for the mega.  I think that the 5v pin limit is from the specific voltage regulator that is used (the part right next to the external power socket.)





That and when using USB power there is a 500ma thermofuse that limits the maximum 5V current one can draw.

Lefty

Un4Seen

Too bad... Well, then I'll just connect the LED driver board directly to the power supply unit.

retrolefty


Too bad... Well, then I'll just connect the LED driver board directly to the power supply unit.


Always a better way to go. The arduino boards are great at controlling stuff but are pretty wimpy at powering things.

Lefty

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