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Electronic tagging system for household objects
#1 Posted : Friday, November 15, 2013 6:37:58 AM(UTC)
Rank: Newbie

Joined: 11/15/2013(UTC)
Posts: 1

Hi to all

Nice site.

Just wanted to know what is the cheapest way to create a system where you can tag household items, and triangulate the position of these tags. The position must then be shown on an iPad, phone or even the PC.

For eg, " 3m in this direction ", with an arrow to indicate the direction.

I know systems have been proposed where wifi sensors are placed on the ceiling. Then rfid rags are used with rfid reader. The problem is the rfid reader is too expensive.

What possible solution is there to this problem ?

#2 Posted : Tuesday, December 10, 2013 9:58:02 AM(UTC)
Rank: Newbie

Joined: 10/21/2013(UTC)
Posts: 2

using cortex-m0 (lpc1224) I am trying to measure the time difference between the rising or the falling edge of two square waves, that i get from the Zero Crossing Detectors.
I am trying to measure phase difference between Current and Voltages of an A.C. Circuit. Getting two inputs from Voltage and Potential transformers.
Someone told me to use CCP to measure the time but that can measure time difference between the events from input on single pin.
But I have two inputs from C.T. and P.T.

I have to measure the power factor of A.C. Circuit, but not finding a proper way to do that.

please ...any early help will be really significant or the logic in lpc1224 .


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