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Typically refers to a specific type of device which allows raw serial communication with a PC via USB.

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atmega328p on breadboard using ftdi to upload sketches @8mhz 3.3v

I could upload sketches using the ftdi. I have the ftdi on a breakout to pin headers. I have the reset pin wired up to the DTR via a 100nf capacitor. The reset has a 10k pull up. … The usart is as follows tx (atmega) ---> rx(ftdi) and rx(atmega) to tx(ftdi). I have also switch between 3.3v and 5v logic using the vccio pin on the ftdi. I.e. vccio = 5v if atmega is 5v. …