Hi,
retrolefty:
Any explanation on that ?
It could be (most likely) that your full setup of external hardware is just drawing too much +5 volt current. The USB 5 volt power coming from your PC is limited by the on-board thermofuse, rated at 500ma max. If however you are running using external power then the on-board 5 volt regulator is supplying the current and it has a little higher max current rating then when using USB power.
Lefty
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Thanks for the information.
However, i removed my maker shield board and tested my UNO R3 board again.
I applied a simple sketch of blinking 1 led only, here again my Board resets itself repeatedly after an interval of 1 min or less.
However when connected to an external power, and removed the USB connection, my board does not reset
????
liudr:
liudr:
Do you have resistors in series with your LEDs?It is strange that you figured out the period of your problem (I wish my students were this good) and more but failed to answer such a simple question.
For now, i have only 1 LED connected, it comes from pin 13, set as output, goes through my LED from +ve pin to -ve via a 1K ohm resistor and eventually to the ground.
For my previous sketch, i was using 5 LEDS, each one connected seperately to their respective output pins, and each have their resistance through their LEDS.
Hope this answers the line, if my resistors were connected in series to my LEDs. . . Sorry for late reply. . 
Can someone kindly please help me, is there anything i can do to restore this problem of reseting through using the USB port?
I will be late in preparing my Garduino .. =( , on top i need to submit that too.
Thanks
taz .. ..