And lo! A Playmobil shepherd boy watched the water level in our Christmas tree stand by night. When there is enough water, his lantern glows green. When there is too little, his lantern turns red. But wait. Your mind has gone elsewhere. You're thinking of it now, the water monitor you would ma...By: jedp
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from Instructables: exploring - technology - robots http://ift.tt/1Czp1UF
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