I am looking to build an Arduino based display box.
10x 4 -digit 7-segment displays and maybe some stand-alone LEDs.I am using the Sparkfun serial 4-digit displays (SparkFun 7-Segment Serial Display - Red - COM-11441 - SparkFun Electronics). I am not yet sure whether I can drive them all off the 5v from the Arduino. I think I may be OK (2 boards currently drawing about 20mA, so hopefully around 100mA for all 10), but I would like to be safe.
Since the PoE board is specified to be able to provide about 1.6A at 5V I was wondering whether I could split this to power the Arduino and the displays seperately. That way I will not have all of the 5V power going through the Arduino 5V pin.