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Network of Keypads, article 2013 year from the Circuit Cellar magazine.

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Network of Keypads by Dhananjay Gadre, Anurag Chugh, Parag Shah, Sneha Lele. SECTION: From the Archives. ABSTRACT: This integrated voting system includes several keypads that feature an ATmega8, a MAX485, a few LEDs, and push buttons. The keypads communicate over the RS-485 bus. A Java application runs on a PC that generates a bar graph similar to the one seen on TV game shows.

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