I've been working on a simple LED controller board that has an ATMEGA328P on-board along with an cheap Bluetooth module from DealExtreme (http://dx.com/p/wireless-bluetooth-rs232-ttl-transceiver-module-80711). I have the RX/TX lines of the Bluetooth module connected to the TX/RX lines of the ATMEGA328, but I also wanted to provide an FTDI interface so different sketches can be uploaded after the board is shipped (so users can update animation patterns, sensor input, etc).
But all of the tutorials and similar projects I've seen using Bluetooth modules with Arduinos have warnings saying that I'll need to disconnect the RX/TX lines between the two, otherwise the FTDI serial connection won't work. If this is correct, how can I isolate my on-board Bluetooth module from the ATMEGA328 when the FTDI interface is active?
I've attached a schematic for my board, if anyone wants to take a look.