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14 digital input / output port,RX, TX, D2 ~~ D13
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8 analog input ports,A0 ~ A7
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1 pair TTL level serial transceiver port RX / TX
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6 PWM ports, D3, D5, D6, D9, D10, D11
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Main ChipAtmel Atmega328P-AU
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Support external power supply 5V
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16MHz clock frequency
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Size:22mm*33mm