Very small size RS232-TTL module.
This will allow a microcontroller to communicate with a computer. It can convert RS232 to any votage TTL. It's powered from the target board and can run at any voltage. If you power the board at 5V and the unit will convert RS232 to 5V TTL. Power the board at 2.8V and the Shifter board will convert RS232 to 2.8V CMOS TTL. Includes two indicator LEDs for TX and RX. Runs from 300bps up to 115200bps.