ESP32+Arduino second serial port use (serial port communication)

Reasons for use: When using GPS, ESP32 needs to receive the serial port data of the GPS module from the serial port

Second serial port position: (marked as TX2 and RX2)

code:

String rev;
void setup() {
    
    
   Serial.begin(115200);//这个是esp32与电脑的串口波特率
   Serial2.begin(9600);//这个是esp32与其他模块的连接时的波特率(写的是其他模块的波特率)
}

void loop() {
    
    
 
 //读到\n为止,然后结束缓冲区读取
 rev=Serial2.readStringUntil('\n');
 //数据打印
 Serial.println(rev);
}

Similarly, if you want to output data to other modules, you can use:

Serial2.println();//或者.print();

Finally, attach the Arduino online simulation platform
https://wokwi.com/