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Topic: Self power down function. (Read 1 time) previous topic - next topic

MichaelMeissner

#5
Feb 25, 2013, 04:06 pm Last Edit: Feb 25, 2013, 05:36 pm by MichaelMeissner Reason: 1
Nick Gammon in his Arduino power saving tome mentions that the TV B-gone product does the various IR controls, and then puts itself to deep sleep, and the button you press is the reset button which powers it back on.  Now this will use some amount of power even when it is sleeping, but in the grand scheme of things, it may be enough for your purposes.  Here is the article: http://www.gammon.com.au/forum/?id=11497

Here is the TV-B-Gone kit that ladyada sells, but I'm not sure if the source is available: http://www.ladyada.net/make/tvbgone

Jimster


This is the circuit that use P-MOSFET to switch the supply line
http://www.edn.com/file/24877-Figure_2.pdf
http://www.edn.com/design/analog/4362161/Transistor-latch-improves-on-off-circuitry


Thanks for all the info guys,

What is the role of the DC/DC converter?

Also is the value of Q1 critial, or will any p channel mosfet be ok?

BillHo


What is the role of the DC/DC converter?

Also is the value of Q1 critial, or will any p channel mosfet be ok?


the role of the DC/DC converter is like the voltage regulator.

Best get the Logic Level p channel MOSFET for the Q1 with spec for your max voltage and current need.

Shpaget

Hmm, would a bistable (latching) relay be a good idea? A button activates it, a circuit is closed and the power to the Arduino starts flowing. Arduino does its thing and when it's done it turns itself off by pulling its own plug.

retrolefty


Hmm, would a bistable (latching) relay be a good idea? A button activates it, a circuit is closed and the power to the Arduino starts flowing. Arduino does its thing and when it's done it turns itself off by pulling its own plug.


I've used such a method on a couple of projects using a single coil latching 5vdc relay.

http://img25.imageshack.us/img25/563/08miq7.jpg

Lefty

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