Ok so I have just got an Arduino Uno. I make a circuit which has 7 LED's, and connected to Digital pin 13 thru 7. it blinks each in sequence, each having a 400 Millisecond delay between On and then off. But there is one problem. I tested with my voltmeter (not included) and the voltage is too low. can I raise the voltage for my digital pin outputs?
Hi,
Welcome to the forum.
Please read the first post in any forum entitled how to use this forum.
http://forum.arduino.cc/index.php/topic,148850.0.html then look down to item #7 about how to post your code.
It will be formatted in a scrolling window that makes it easier to read.
Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png?
Or a clear picture of your project.
Have you got current limit resistors fitted to each LED.
400mS is not long enough for a DMM to get reliable reading.
Tom... 
Mudkip909:
Ok so I have just got an Arduino Uno. I make a circuit which has 7 LED's, and connected to Digital pin 13 thru 7. it blinks each in sequence, each having a 400 Millisecond delay between On and then off. But there is one problem. I tested with my voltmeter (not included) and the voltage is too low. can I raise the voltage for my digital pin outputs?
Operating voltage for Arduino UNO is 5V and output voltage of an UNO is the same, as long as you stay within the controller specifications. This is enough to drive a low-power LED of any color with a couple of milliamperes.
Which color(s) are your LEDs?
Which resistor values do you use for the seven series resistors connected to your LEDs?
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