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i'have a problem with ardunio. the problem is that when i'm connected with the pc it's working however when connecting it with the 9v battery not all components are functioning. what should i do its is possible to conenct another battery of 9V??
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Hi,
   Check the two links in my signature for an idea of whats happening and how to get around it. The examples use servos but apply to power orientated components in general.

Duane B

rcarduino.blogspot.com
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Have you followed the play ground?

http://arduino.cc/playground/Learning/9VBatteryAdapter
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i'have a problem with ardunio. the problem is that when i'm connected with the pc it's working however when connecting it with the 9v battery not all components are functioning. what should i do its is possible to conenct another battery of 9V??

What other components are you using?  Do you mean 9V battery as in the rectangle type?  Those have extremely low current supply capability.  They are not suitable for... well, anything really.
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Quote

As James C4S has already pointed out 9V batteries are hopeless, check the links in my signature to see why, especially given that the OP is running motors, shields and who knows what else.

Duane B

rcarduino.blogspot.com
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Actually its not that bad - PP3 9V batteries (the small sort) have a low current drive, perhaps 30mA is a reasonable maximum to expect from them, but the rechargeable versions are beefier (and rechargeable smiley  probably get 100mA or more from them.

There are larger 9V batteries available, the PP6 and PP9 for instance, often only sold as specialist flashlight batteries, and these can provide a lot more current.  A set of 6 AA's provides an alternative 9V source if you can source a 6-cell battery holder.


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i'have a problem with ardunio. the problem is that when i'm connected with the pc it's working however when connecting it with the 9v battery not all components are functioning. what should i do its is possible to conenct another battery of 9V??

You need to be more specific. What else do you have connected to the Arduino? What components are not functioning?

As has been mentioned, 9V alkaline batteries cannot provide much current - they can power an Arduino and a few LEDs or an LCD display and backlight, but not much more. The Lithium variants are a lot better (see http://data.energizer.com/PDFs/la522.pdf) but expensive. A stack of 4 or 6 AA cells is much better value if you have the space.
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Quote
Do you mean 9V battery as in the rectangle type?  Those have extremely low current supply capability.  They are not suitable for... well, anything really.

Thanks for this, James C4S.  I've experienced problems as well with 9V batteries but didn't know why...
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