No, just to detect if the circuit is open --- On Mon, 2/28/11, Mark Rages wrote: > From: Mark Rages > Subject: Re: [PIC] open circuit detection > To: "Microcontroller discussion list - Public." > Date: Monday, February 28, 2011, 2:15 PM > On Mon, Feb 28, 2011 at 3:07 PM, alan > smith > wrote: > > I have a sensor, that when its activated, it goes from > a 15ohm to open circuit. =A0This is a battery powered device, > so low current is critical. It will bounce back and forth, > as its a motion detector of sorts. > > > > The approach I was going to take (and build up to test > later) is to put a 330K resistor in series being fed by the > box 3.3V power, and connect the A/D of the PIC between the > sensor and the resistor. =A0Normally it will pull some small > amount of current and thus a voltage drop to measure, and on > a open circuit if course it should read zero. > > > > Any other ideas on measuring for an open circuit with > very low power consumption? > > >=20 > Are you trying to measure on/off or a range of values? >=20 > Regards, > Mark > markrages@gmail >=20 > --=20 > Mark Rages, Engineer > Midwest Telecine LLC > markrages@midwesttelecine.com >=20 > --=20 > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist >=20 =20 --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .