Project 1: Hello World

Overview

For ESP32 beginners, we will start with some simple things. In this project, you only need a ESP32 mainboard, a USB cable and a computer to complete the “Hello World!” project, which is a test of communication between the ESP32 mainboard and the computer as well as a primary project.

Components

ESP32*1	USB Cable*1

Wiring Diagram：

In this project, we will use a USB cable to connect the ESP32 to a computer.

Test Code

//*************************************************************************************
/*
 * Filename    : Hello World
 * Description : Enter the letter R,and the serial port displays"Hello World".
 * Auther      :http//www.keyestudio.com
*/
char val;// defines variable "val"
void setup()
{
Serial.begin(9600);// sets baudrate to 9600
}
void loop()
{
  if (Serial.available() > 0) {
    val=Serial.read();// reads symbols assigns to "val"
    if(val=='R')// checks input for the letter "R"
    {  // if so,    
     Serial.println("Hello World!");// shows “Hello World !”.
    }
  }
}
//*************************************************************************************

Before uploading the test code to the ESP32，click“Tools”→“Board”，select“ESP32 Wrover Module”.

Select the correct serial port.

Note：For macOS users, if the upload fails, set the baud rate to 115200 before clicking .

Click to upload the test code to the ESP32.

Note: If the uploading code fails, you can press and hold the Boot button on the ESP32 after clickingand release it after the percentage of uploading progress appears., as shown below:

The code is uploaded successfully.

Test Result

After uploading successfully，we will use a USB cable to power on，click to enter the serial monitor and set the baud rate to 9600，enter the letter“R”，click“Send”，then the serial monitor prints“Hello World!”.