a frame work to support accessing digital pins and analog pins on arduino using Serial(BT or something else)
==
Features +++++++++++++++++++++ 0 support a read/write to all digital pins and read to analog pins
1 support a PWM read/write(0~1023) to all PWM digital pins
2 support a 4-wire SPI protocol
3 support a I2C protocol
4 support a onewire protocol
5 support to read/write to Serial/Serial2/Serial3 (* only for mega)