Arduino Usb-to-Serial Converter - A000107
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This board converts a USB connection into a 5 volt Serial TX and RX that you can connect straight to the Arduino Mini or other microcontrollers, allowing them to talk to the computer. It features an Atmega16U2 programmed as a USB-to-serial converter, the same chip found on the Arduino Uno. The '16U2 firmware uses the standard USB COM drivers, and no external driver is needed. However, on Windows, a .inf file is required.
The USB Serial Adapter has an onboard micro-USB connector and 5 pins including RX (for receiving data from the computer) and TX (for transmitting data). 5V, Ground and a Reset pin are also exposed.
Status lights include power, RX and TX activity.
The adapter can easily connect to the Arduino Mini.
An onboard polyfuse limits the current to 500mA and protects the host computer from short circuits.
The ATmega16U2 firmware source code is available. The ATmega16U2 is loaded with a DFU bootloader, refer to the DFU mode section. You can then use Atmel's FLIP software (Windows) or the DFU programmer (Mac OS X and Linux) to load a new firmware if required. You can use the ISP header with an external programmer (overwriting the DFU bootloader). See this user-contributed tutorial for more information.
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