plug the arduino into the usb board and immediately enter into DFU mode by momentarily connecting ground and reset pins Now upload the normal firmware for uno using the ATMEL FLIP software only ...

Arduino USB-DMX A firmware to use an Arduino as a USB-TTL-DMX thingie. Just attach your USB-TTL-Converter to 13 (RX) and 11 (TX). Now use a serial connection from your device to send data using the ...