Hardware Serial is Serial is Hardware of Arduino directly, can work well and efficiently as possible, but due Arduino. Some boards as Uno have Hardware Serial just one box, and use as a main port for the program. The use is quite difficult because if there is another Hardware peripheral leg 0 (Rx) and 1 (Tx) of Uno may be unable to upload a program to the board. Arduino. And this port is often used to transfer data with computers, or used for debugging solve problems or state function of the program. For use with the Arduino Uno suggested to use Software Serial will more convenient, the use of Hardware Serial suggest used on board. Arduino with Hardware Serial than 1 channels, such as Arduino Mega 2560 Arduino Due Arduino Leonardo (Hardware Serial split with channel up the program. USB CDC).
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