Arduino Software Serial User Guide - Seeed Wiki

Home » Arduino Newsoftserial.h » Arduino Software Serial User Guide - Seeed Wiki

Maybe your like

The Arduino hardware has the built-in support for Serial communications on pins 0 and 1 (Hardware Serial) but in some circumstances such as when these pins are already in-use or you need more Serial ports for debugging, Software Serial may seem to be the solution.

Here will also use an example to demonstrate how to use Software Serial with you Arduino!

Software Serial Example​

/*RX is digital pin 2 (connect to TX of other device)TX is digital pin 3 (connect to RX of other device)*/#include<SoftwareSerial.h>SoftwareSerial mySerial(2,3);// RX, TXvoidsetup(){ Serial.begin(115200);while(!Serial){} Serial.println("Goodnight moon!"); mySerial.begin(9600); mySerial.println("Hello, world?");}voidloop(){if(mySerial.available()) Serial.write(mySerial.read());if(Serial.available()) mySerial.write(Serial.read());}

In practice, you may also use other serial devices, such as serial wireless pass-through modules, serial sensors, etc., as long as it is standard. The serial devices are all programmed in much the same way.

Using Multiple Software Serial​

When you need multiple serial devices to be connected, it is possible to create multiple software serial ports. But due to hardware limitation, Arduino UNO can only listen to one software serial at a time. Here provides an example for multiple software serial:

#include<SoftwareSerial.h>SoftwareSerial serialOne(2,3);// Software Serial ONESoftwareSerial serialTwo(8,9);// Software Serial TWOvoidsetup(){ Serial.begin(9600);while(!Serial){// wait till Serial} serialOne.begin(9600); serialTwo.begin(9600);}voidloop(){ serialOne.listen();// listening on Serial One Serial.println("Data from port one:");while(serialOne.available()>0){char inByte = serialOne.read(); Serial.write(inByte);} Serial.println(); serialTwo.listen();// listening on Serial Two Serial.println("Data from port two:");while(serialTwo.available()>0){char inByte = serialTwo.read(); Serial.write(inByte);} Serial.println();}

Tech Support & Product Discussion​

Thank you for choosing our products! We are here to provide you with different support to ensure that your experience with our products is as smooth as possible. We offer several communication channels to cater to different preferences and needs.

Tag » Arduino Newsoftserial.h