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http://digitrode.ru/articles/1318-pyat-shem-delitelya-napryazheniya-prednaznachennyh-ne-tolko-dlya-deleniya-napryazheniya.html
http://studrobots.ru/voltage-sensor-arduino/
http://www.joyta.ru/7328-delitel-napryazheniya-na-rezistorax-raschet-onlajn/