Hi all, I've read the threads about the breadboard arduinos and usb to serial adapters, I couldn't find a definitive answer to the topic.
Throughout all of the threads and all of the tutorials for building a breadboard arduino the part quoted for usb to serial is always a 3.3v whatever the chipset is. I have at least 3 different usb to serial adapters here, an ftdi 232R (5V) cable, a couple of prolific 2103's? and a moschips 7720 based dual serial port adapter. I expect the ftdi cable is most likely to work, I haven't tried it yet, I did try the moschips cable and got sync errors when trying to upload, I can confirm that the breadboard arduino is working ok though as I can re-program it in my diecimila.
As I understand things, the TX/RX from the atmega 168 pins are just re-purposed GPIO pins, so as such aren't they at 5V? which means the ftdi cable at least should work, the moschips hopefully, but seems to be a slightly more obscure chipset, not sure how well its been implemented and I know from experience that usb to serial adapters are flaky.
If 3.3V is essential then can I use a logic level converter between the TX/RX pins on the atmega 168 and my target usb to serial device?