ATmega2560通过USB接口与PC进行传输，供电电压为5V，内部晶振为16MHz。该芯片共有有54个I/O引脚，特别适用于需要大量I/O口电路，其中的16个可以提供脉宽调制（PWM）模拟输出，还有另外16个模拟输入引脚。在通信方面，有4个硬件串口，另外也可以支持SPI通信和I2C/TWI设备。设计核心电路中加入复位按键，通过USB串口进行通信。-ATmega2560 through the USB interface with the PC for transmission, power

Check the clock frequency & that the baud rate required can be achieved. Error of <1 is never a problem, <2 will work but is undesirable, 5 will not work. Note that this assumes that the other end of the link has perfect timing, which will norm