TimerUART is an implementation of a UART using a Timer interrupt for each bit rather than using the hardware UART built into the chip.
To use:
Add the following to your .pde file:
#include <Timer-UART.h>
Create an instance of TimerUART, passing it the Tx pin number:
TimerUART serial(A1);
Call the init method to set the baud rate:
serial.init(38400);
Use print statments to write data to the serial port:
serial.println("This is a test");
The baud rates suppported depend on the frequency your AVR is running at. Dividing the CPU frequency by the baudrate and by 8, should yield a number which will fit in an 8-bit value.
8000000 / 38400 / 8 = 26
So using 34800 baud on an 8MHz part should be fine.