1. 14 digital input/output port RX and TX, D2 ~ D13, 2. 8 analog input port A0 ~ A7 3. 1 to the TTL level a serial port to send and receive port RX/TX 4.6 a PWM port, D3, D5, D6, D9, D10, D11 5. Using Atmel Atmega328P – AU microcontroller 6. Support serial download 7. Support external 3.3 V ~ 12 V dc power supply 8. Support 9 v batteries 9. 16MHz/8MHz clock frequency 10. Size: 33.3 *18 (mm)
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