Arduino Forum

Using Arduino => Installation & Troubleshooting => Topic started by: 2632 on Aug 07, 2011, 03:24 am

Title: Getting HOT, HOT, HOT...
Post by: 2632 on Aug 07, 2011, 03:24 am
I just got my first Arduino and am in love  :smiley-mr-green:

But, after having it on most of the day sitting on my desk the board by the power connector was so hot I could not keep my finger on it. 

I had an Ethernet shield, and 16x2 LCD display connected.  The LCD display had 3.3k resistor inline with e back light.  Power supply is 10v DC

Is this normal ?????????????????
Title: Re: Getting HOT, HOT, HOT...
Post by: 2632 on Aug 07, 2011, 06:51 am
kinda what I was thinking, but how else do I power the Ethernet shield? It appears to be a power hog.

I don't know the draw on the LCD but I assumed it was not much.  I will put a meter on it today and see.
Title: Re: Getting HOT, HOT, HOT...
Post by: CrossRoads on Aug 07, 2011, 06:59 am
Tight squeeze to try and get a heat sink in there.

Order yourself a lower voltage supply, like 5V and connect to the header pins, or 7.5V to go thru the barrel jack.

http://www.dipmicro.com/store/DCA-0510
http://www.dipmicro.com/store/DCA-0520
http://www.dipmicro.com/store/KLDX-0202-A  ,Add a couple of wires to connect to +5 & Gnd

http://www.dipmicro.com/store/DCA-07510
Title: Re: Getting HOT, HOT, HOT...
Post by: 2632 on Aug 11, 2011, 04:56 am
What can the on board regulator provide for total "accessory" current?

My Ethernet shield is drawing 0.17 A and will start to cook the regulator in about one min.


CrossRoads, that was my thoughts, I will go digging in the box-o-wall warts.
Title: Re: Getting HOT, HOT, HOT...
Post by: CrossRoads on Aug 11, 2011, 05:04 am
Onboard regulator is rated at 800mA with proper heatsink.
Will cut off sooner if gets too hot.
If you'd ordered from dipmicro on the 6th you'd have had it already ...

Any chance you run to YouDoIt Electronics in Needham & grab one?
Or maybe poke around Ocean State Job Lot?
Title: Re: Getting HOT, HOT, HOT...
Post by: 2632 on Aug 11, 2011, 05:58 am

Onboard regulator is rated at 800mA with proper heatsink.
Will cut off sooner if gets too hot.

Wow...


If you'd ordered from dipmicro on the 6th you'd have had it already ...

I am sure I have one in the box down stairs, just need to go look  XD


Any chance you run to YouDoIt Electronics in Needham & grab one?
Or maybe poke around Ocean State Job Lot?

I have yet to go to You-Do-It, but I have it on my list next time I have free time and am in Needham  8)
As for Ocean State, I got that covered... The wife works for them.
Title: Re: Getting HOT, HOT, HOT...
Post by: Rivello on Aug 11, 2011, 05:09 pm
02660,

What surface you let your Arduino above and which material is it made of?
Title: Re: Getting HOT, HOT, HOT...
Post by: JChristensen on Aug 11, 2011, 06:30 pm

http://www.dipmicro.com/store/DCA-0510
http://www.dipmicro.com/store/DCA-0520
http://www.dipmicro.com/store/KLDX-0202-A 
http://www.dipmicro.com/store/DCA-07510


What's up with the sizes on these power connectors?  I've seen 2.1mm and 2.0mm.  Are they compatible?  The Kycon KLDX-0202-A is 2.0mm according to the datasheet.  I bought some similar jacks elsewhere that were called 2.1mm but now that I look at the datasheet, I think they're really 2.0mm.  Can't get the calipers in to get a good measurement.  I've bought wall warts from Sparkfun and Adafruit and they're called 2.1mm on their websites.  DIP Micro calls all theirs 2.0mm.  I haven't had any compatibility problems but I'm wondering.  Seems silly why a 2.1mm part would be needed if the 2.0mm version already existed, or vice versa.
Title: Re: Getting HOT, HOT, HOT...
Post by: CrossRoads on Aug 12, 2011, 04:00 am
Jack,
They say 2mm but they take the 5.5/2.1 power cords quite snugly.