Arduino Multiple Serial

Reference SoftwareSerial LibraryThe Arduino hardware has built-in support for serial communication on pins 0 and 1 (which also goes to the computer via the USB connection). The native serial support happens via a piece of hardware (built into the chip) called a.

Arduino Two Serial Communication

This hardware allows the Atmega chip to receive serial communication even while working on other tasks, as long as there room in the 64 byte serial buffer.The SoftwareSerial library has been developed to allow serial communication on other digital pins of the Arduino, using software to replicate the functionality (hence the name ' SoftwareSerial'). It is possible to have multiple software serial ports with speeds up to 115200 bps.