A standard Arduino includes a USB to TTL chip
so we can make it as a adapter
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Step 1: One Thing You Have to Do
what we have to do is to plug one wire between RESET & GND
easy, dosen't it?
Now, you can use RX (pin 0) and TX (pin1) to communcate~~
Step 2: How It Works?
after you plug the wire,
this change the MCU into "Reset Mode"
so now only FTDI chip work on your arduino board!!