Example Code for Arduino-Serial Port

Hardware Preparation

• FireBeetle 2 ESP32-E (SKU: DFR0654) ×1
• USB cable ×1

Other Preparation Work

We have learned how to light up the LED through the IO port before. In this lesson, we'll learn about the principle of serial communication. FireBeetle 2 ESP32-E development board has two hardware serial ports, and both of them are remappable. UART0, also Serial in Arduino, is used for USB.

Sample Code

Program function: the UART serial prints timing data once per second.

void setup() {
  Serial.begin(115200);    //Initialize the serial port and set the baud rate to 115200
}

void loop() {
 static unsigned long i = 0;  //Static variables(local variables), initialized only once
 Serial.println(i++);   //serial prints i++
 delay(1000);
}

Result

Open the serial monitor, set the baud rate to 115200, and you can see the printed value increasing every second.