Comments on: Ligthy power save http://jeelabs.org/2009/07/05/ligthy-power-save/ Computing stuff tied to the physical world Mon, 06 Feb 2012 13:55:24 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Stephen Eaton http://jeelabs.org/2009/07/05/ligthy-power-save/#comment-173 Stephen Eaton Tue, 14 Jul 2009 14:18:31 +0000 http://jeelab.wordpress.com/?p=2293#comment-173 <p>A ground loop is when ground is supposed to be at the same potential across the circuit, but they are not for some reason, so there is a voltage difference between the supposed same reference.</p> A ground loop is when ground is supposed to be at the same potential across the circuit, but they are not for some reason, so there is a voltage difference between the supposed same reference.

]]> By: jcw http://jeelabs.org/2009/07/05/ligthy-power-save/#comment-168 jcw Mon, 13 Jul 2009 07:50:23 +0000 http://jeelab.wordpress.com/?p=2293#comment-168 <p>Hm, that's something I know nothing about. Could you elaborate?</p> Hm, that’s something I know nothing about. Could you elaborate?

]]> By: Stephen Eaton http://jeelabs.org/2009/07/05/ligthy-power-save/#comment-165 Stephen Eaton Sun, 12 Jul 2009 15:10:03 +0000 http://jeelab.wordpress.com/?p=2293#comment-165 <p>ground loop somewhere?</p> ground loop somewhere?

]]> By: jcw http://jeelabs.org/2009/07/05/ligthy-power-save/#comment-163 jcw Sat, 11 Jul 2009 08:42:43 +0000 http://jeelab.wordpress.com/?p=2293#comment-163 <p>No, I tied the "ground" of those two voltage dividers to a single data pin, with the idea of leaving it floating to power it off. Haven't really thought it through. But there's something really puzzling going on - when I disconnect everything (including that floating ground) and leave only ADC6/7 connected, it <em>still</em> draws 2.6 mA. I'm stumped, will need to spend some more time debugging this...</p> No, I tied the “ground” of those two voltage dividers to a single data pin, with the idea of leaving it floating to power it off. Haven’t really thought it through. But there’s something really puzzling going on – when I disconnect everything (including that floating ground) and leave only ADC6/7 connected, it still draws 2.6 mA. I’m stumped, will need to spend some more time debugging this…

]]> By: Stephen Eaton http://jeelabs.org/2009/07/05/ligthy-power-save/#comment-160 Stephen Eaton Sat, 11 Jul 2009 05:00:19 +0000 http://jeelab.wordpress.com/?p=2293#comment-160 <p>I would think the likely source is the voltage dividers for the light sensors disabled? I see that you enable/disable them via the software, but what is the circuit you have for them? Is it a transistor/FET doing the switching?</p> <p>Keep up the great work!</p> I would think the likely source is the voltage dividers for the light sensors disabled? I see that you enable/disable them via the software, but what is the circuit you have for them? Is it a transistor/FET doing the switching?

Keep up the great work!

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