Tutorial: Hello UART (EduESP32-S3)

Serial communication on the ESP32-S3 using HardwareSerial.

Available ports

The ESP32-S3 exposes three UARTs. Serial (UART0) is wired to the built-in USB-Serial for debugging.

Arduino code

HardwareSerial MySerial(1);

void setup() {
  Serial.begin(115200);                                 // USB console
  MySerial.begin(115200, SERIAL_8N1, 18, 17);           // RX, TX
  Serial.println("Hello UART from ESP32-S3");
}

void loop() {
  MySerial.println("Hello, UART world!");
  while (MySerial.available()) {
    Serial.write(MySerial.read());                      // echo to USB monitor
  }
  delay(1000);
}

Test

• Open the Serial Monitor at 115200 baud.
• On Serial1, plug a USB-Serial adapter crossed (TX↔RX, common GND).

Next step

Continue with Tutorial: Hello Wi-Fi to bring your board online.