Some experiences of Arduino soft serial port communication

1、arduino On the main board RX  TX Pin Sometimes not enough , At this time, we need to put others Pin Through software Analog to serial communication pin , But not every pin   Can be converted like this , Different boards , Somewhat different .

2、arduino Uno There is only one   RX  TX Pin , Namely 0 and 1 Pin , These two pins are usually used to communicate with the computer by default ,Serial.begin   Serial.print   Serial.read  This pin is targeted . If arduino Uno Serial communication with other hardware is required , It must be Set soft serial port , Put other pins Used as a serial communication pin . First Will be   Contains the corresponding library functions   SoftwareSerial.h ,    then use    SoftwareSerial   name(rxPin, txPin)  To define a soft serial port name, also And use it name.listen(), To monitor this soft serial port .  Of course   Nor can any pin be used as a serial communication pin （ The pin needs to support interrupt function ）.

3、 If the original arduino On my board   There is More than one   TX RX Pin , Sometimes You can use it directly On the board TX RX Pin . With   arduino mega 2560 Come on , Above all Yes   RX0 TX0, RX1  TX1,RX2 TX2,RX3 TX3  Four pairs of serial port pins , RX0 TX0 ,  It communicates with the computer by default , use serial Set up ,  When communicating with other boards , If it is connected to  RX1  TX1 On , We use it serial1 To set up , Empathy    Connect to  RX2  TX2 On , We use it serial2 To set up , You don't need to use   SoftwareSerial  To set the soft serial port , Also need not listen() Function to monitor .  however   If we use other pins   such as   10 11 To do serial communication , To use   SoftwareSerial   name(rxPin, txPin)    To set .