product description:
Parameters 1．Main Chip：ATMEGA328 microcontroller
2．USB power supply：5v
3．external power：7-12v，(9v recommended)
4．digital input/output pins: 14（of which 6 pins support PWM）
5．analog input pin: 6
6．built-in flash memory：32K
7．SRAM: 2k
8．EEPROM:1K
9．clock frequency：16MH
10.TCP/IP Ethernet controller W5500、MicroSD card mount（TF card）、MicroUSB
Related Introduction About Chip: 1.ATMEGA328P-AU
2.Atmega16U2
USB to serial chip
3.AMS1117
4.5V and 3.3V stabilivolt chip
5.W5500 network chip
About Interface: 1. ICSP interface
Program firmware to ATMEGA328P-AU
2. Digital interface D0-D13
Serial communication：D0(RX) and D1(TX)
External interruption：D2（interrupt 0）、 D3（interrupt 1）
PWM interface：D3、D5、D6、D9、D10 、D11
SPI communication：D10(SS)、D11(MOSI)、D12(MISO)、D13(SCK)
3. ICSP interface
Program firmware to Atmega16U2
4. USB port
For program download or serial debugging
5. DC power connector
Access to 7V-12V voltage
6. Power output port
Output 3.3V or 5V，for external power supply or common ground handle
7. Analog interface A0-A5
IIC communication：A4(SDA) and A5(SCL)
Also can be used as digital interface：A0(D14)、A1(D15)、A2(D16)、A3(D17)、A4(D18)、A5(D19)
8. Network connector
RJ－45 network port
About Component: 1.reset button
2.16MHz crystal oscillator
3.25MHz crystal oscillator
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