ESP32 Serial ports

[PYJTER]

Good morning everyone,
I have a question, I'm a bit confused because I don't know what pins I should look for in esp32-s3-wroom-1 for my Serial0, Serial1 and Serial2 ports? Could someone give me some advice?

I set Serial1 but unfortunately there is no response on pins 17,18 ;(
Thank you very much in advance for your help

[Whandall]

The ESP32 can be configured to use nearly any pin for serial communication.

Tech Note 137 - ESP32 a further insight into using the serial ports

[horace]

used the following code on a ESP32-S3 DevkitC-1 Serial1 on pins 17 and 18 worked OK

// ESP32-S3 DevkitC-1  Serial1 test - for loopback test connect pin GPIO17 U1TXD to pin GPIO18 U1RXD"
// ss https://docs.espressif.com/projects/esp-idf/en/latest/esp32s3/_images/ESP32-S3_DevKitC-1_pinlayout_v1.1.jpg

#define RXD1 18
#define TXD1 17

void setup() {
  // initialize both serial ports:
  Serial.begin(115200);
  Serial1.begin(115200, SERIAL_8N1, RXD1, TXD1);
  Serial.println();
  Serial.println("\n\nESP32-S3 DevkitC-1 serial1  test pin GPIO17 U1TXD pin GPIO18 U1RXD");
  Serial.write("   for loopback test connect pin GPIO17 U1TXD to pin GPIO18 U1RXD\n");
}

void loop() {
  // read from port 1, send to port 0:
  if (Serial1.available()) {
    int inByte = Serial1.read();
    Serial.write(inByte);
  }

  // read from port 0, send to port 1:
  if (Serial.available()) {
    int inByte = Serial.read();
    //Serial.write(inByte);
    Serial1.write(inByte);
  }
}

connect pin 17 to pin 18 forms a loopback test - characters entered on serial monitor keyboard are transmited over Serial1 and the received characters displayed