Arduino Mini 328 3v
Features:
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ATmega328 running at 8MHz with external resonator (0.5% tolerance)
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Low-voltage board needs no interfacing circuitry to popular 3.3V devices and modules (GPS, accelerometers, sensors, etc)
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Dimensions: 18x33mm
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0.8mm Thin PCB
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USB connection off board
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Weighs less than 2 grams!
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Supports auto-reset
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3.3V regulator
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Max 150mA output
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Over current protected
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DC input 3.3V up to 12V
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On board Power and Status LEDs
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Analog Pins: 8
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Digital I/Os: 14