Here is best & compact solution for finding electric wire connection into wall...Components:1) BC547 - 32) Resistor - 1M, 100K, 220E3) Battery 9V - 14) LED - 1This is project also can be used as Touch Sensor
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mudholkar_prasadContinue Reading »from Instructables: exploring - technology - robots http://ift.tt/1vOP71M
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