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This is supposed to be a Arduino Pro Micro (based on Leonardo) with a boost converter so that the whole circuit can be driven by single 1.2V AA Ni-MH or 1.5V AA alkaline battery. The whole board will fit within the space of the battery with USB port used for charging the battery when connected to USB port. Charging will be done by ATMega using a digital port and ADC port. Other pins will be available for circuit design.