Monthly Archives: June 2013

Connecting USB to Serial/TTL to Breadboard “Mega-P”

Now, with a Breadboard Mega built out, we need a way to get programs or sketches onto the microcontroller.  One of many tools is a USB to Serial or TTL (Transitor-Transitor Logic) breakout board.  The most common is FTDI232RL, but there are others.  This board will allow one to UPLOAD a sketch onto the ATmega1284 without disturbing the bootloader in Flash or the EEPROM.  Other ways use a programmer that erase and overwrite the microcontroller and the bootloader will be no more.  Of course, you can use the programmer to put the bootloader back, but not both at the same time.

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