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• 06:11, 19 September 2013 Glu talk contribs uploaded File:Plant board top.jpg (The board was a bit small for this project, but all fits. The whole thing uses the magic of the 4093 (a quad, dual input, Schmitt-trigger NAND port IC). It feeds the feelers (green pins) with a low current AC, then checks whether or not the voltage is hig)