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Saturday, December 20, 2014

Use Arduino as a USB to TTL Serial Converter

USB to TTL Serial is a module to convert the USB signals to TTL Serial signals. Serial protocol (RS232) is a standard for interfacing between computer and embedded device. Serial protocol is a standard that easy to use, but on new model motherboards or laptops, serial port is no longer supported. So USB to TTL Serial converter can be a solution for interfacing between computer and embedded device.


In this module, an IC such as FTDI is used to convert USB signals to TTL Serial signals. Other alternative to FTDI is use microcontroller that can be programmed as USB to TTL Serial converter such as ATmega16u2. This IC used to handle the USB communications on one side, and TTL serial communications on the other.


Arduino used this IC (FTDI on Arduino Duemilanove or ATmega16u2 on Arduino Uno to communicate between computer and bootloader inside ATmega328 Microcontroller. So Arduino can be used as a stand alone USB to TTL Serial converter. To use an Arduino as a USB to TTL Serial converter can be done by connect a jumper from RESET to GND. And your Arduino is now a USB to TTL Serial converter.  TX, RX, and GND are the connections.

5 comments :

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