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Topic: Uno Board (Read 408 times) previous topic - next topic

FoXX

Hi There
Just got an Uno for Christmas, what i don't understand is that it seems to reset.
If i run the Blink sketch it blinks like 16 times and then flickers on the the LED and runs again.
If i push reset it runs like 8-16 times.. Am i missing something?

Thanks in advance
Mikkel

stonent

#1
Dec 28, 2012, 02:12 am Last Edit: Dec 28, 2012, 02:14 am by stonent Reason: 1
Are you powering it from USB or from the power jack.  If the power jack, what are you using?

If you are powering from the USB port, make sure you're plugged directly into the computer and not into a hub, keyboard or monitor port.

Many of those ports only supply 100ma which should barely be enough. I've tested my Uno at 85mA peak so far, but just running LEDs and a speaker.  If you have more inputs and outputs running, you could be too low. I've found some keyboards that can't give enough juice to power some thumb drives.

I tried running my Uno off of 3 AA batteries that were in a rechargable battery pack directly to the jack but the lights just dimly flickered and the sketch didn't run.  Not enough juice.


smeezekitty


I tried running my Uno off of 3 AA batteries that were in a rechargable battery pack directly to the jack but the lights just dimly flickered and the sketch didn't run.  Not enough juice.

Thats because the jack is regulated. You need 5.5v at the absolute minimum to get the Arduino working and need atleast 6.5v to make the "5v" line a stable 5v. The 3.5-4v of a 3 cell rechargeable pack will not be enough. It *might* work on the 5v pin.
Avoid throwing electronics out as you or someone else might need them for parts or use.
Solid state rectifiers are the only REAL rectifiers.
Resistors for LEDS!

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