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by Mjolinor
Wed Sep 11, 2013 9:25 pm
Forum: Automation, sensing and robotics
Topic: Controlled Shutdown at Power Failure
Replies: 72
Views: 54499

Re: Controlled Shutdown at Power Failure

I found a way to detect full shutdown but it isn't graceful. The composite video out signal is there all the time until shutdown is complete so passing that through a low pass filter gives a constant DC offset of about 0.5 volts. This can be detected by the PIC I am using because it has 2 analogue c...
by Mjolinor
Mon Sep 09, 2013 7:49 am
Forum: Automation, sensing and robotics
Topic: Controlled Shutdown at Power Failure
Replies: 72
Views: 54499

Re: Controlled Shutdown at Power Failure

Lot of reading in this post and I think it's all a bit complicated. I made this to do the same thing: http://i.imgur.com/Fj0TqXe.png I keep making changes to it and currently I use just under 6 volt for the supply, there is no 7805 and I use a 4.8 volt nicad. The Pi monitors P1 pin 12 with a bash sc...

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