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Have a look at this cool PIC 12F683 Microcontroller Based Logic Probe. First, this device determine if the wire is floating, this is done by applying a weak current into it with a pin on the microcontroller and see if the state changes, and draw a weak current from it using the pin and see if it changes. The current is weakened by the 10k resistor attached to the pin, commonly called a pull up or pull down resistor if used for this purpose (overriding the state of a floating wire). If the state changes, it means the wire is floating, and the device indicate that using a LED. If it’s not floating, then the voltage on the wire should indicate a logic high or low, and the device indicate that using another LED.”
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October 21st, 2007
Would be cool if its not waste a pic. If u decide to build this i advise wait a little and check http://members.cox.net/berniekm/super.html this out…