I have standalone boarduino with Atmega 328P installed. The board has no USB interface. I recently purchased 300bps~3Mbps USB Adapter for Arduino from deal extreme website:
Now their are 6 pinout from that device: VBUS/TXD/RXD/GND/3.3V/DTR
The Boarduino is supplying +5V to Atmega 328P chip thru voltage regulator 7805.
My Question are:
1- can i upload the sketches on my standalone boarduino with the above device?
2- Should I use Tx/Rx/Gnd and DTR of that device only ? What is VBUS and 3.3V? when VBUS and 3.3V is required?
Following is i am thinking to connect the boarduino with above USB device:
a) Connect Atmega 328, Pin1 (Reset) connected with USB device DTR with 0.01uF ceramic capacitor.
b) Connect Atmega 328, Digital pin 0 with USB device Tx pin
c) Connect Atmega 328,Digital Pin 1 with USB device Rx Pin
d) Connect Atmega 328, GND with the USB device GND