Wierd Power Problem

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1

Hello List:

I have a problem that I didn’t anticipate.

I have an embedded system with battery backup.

Actually it runs off of the battery and external supply keeps the battery charged.

Here is my problem:

I can use the power button/signal to power the unit down, but how do I get it to power up again?

The unit doesn’t have an On/Off switch, so I can’t simply cycle the power ….

Any ideas ??

Bill

“No one could make a greater mistake than he who did nothing because he could do only a little.”

“All that is necessary for the triumph of evil is that good men do nothing” Edmond Burke (1729 - 1797)

http://www.packtpub.com/building-a-home-security-system-with-beaglebone/book

http://ca.linkedin.com/pub/bill-pretty/2b/b07/602

2

Hello

I assume you are using the barrel connector. Could you use the USB connector to provide power? I find a different result on my BBB if I use the USB vs the barrel.

or perhaps I don’t fully understand your issues ???

cheers

3

Thanks DLF;

I should have been more clear.

I am feeding power into the Beaglebone via P9 but I could switch to the barrel connector fairly easily.

Bill

“No one could make a greater mistake than he who did nothing because he could do only a little.”

“All that is necessary for the triumph of evil is that good men do nothing” Edmond Burke (1729 - 1797)

http://www.packtpub.com/building-a-home-security-system-with-beaglebone/book

http://ca.linkedin.com/pub/bill-pretty/2b/b07/602

4

Well in your application you would need another small CPU monitoring
power and issuing a reset upon power good
there is a battery cape that does just that. I have a design that does
that for my design using a BBB.
http://andicelabs.com/beaglebone-powercape/
something i noticed in testing for my design. once things are off there
is nothing to tell the BBB to restart.