Freenove ESP32-S3 User Manual

Any concerns?  support@freenove.com
41
Chapter 2 Serial Communication
█ www.freenove.com
The following is the program code:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
String inputString = ""; //a String to hold incoming data
bool stringComplete = false; // whether the string is complete
void setup() {
Serial.begin(115200);
Serial.println(String("\nESP32S3 initialization completed! \r\n")
+ String("Please input some characters,\r\n")
+ String("select \"Newline\" below and Ctrl + Enter to send message to
ESP32S3. \r\n"));
}
void loop() {
if (Serial.available()) { // judge whether data has been received
char inChar = Serial.read(); // read one character
inputString += inChar;
if (inChar == '\n') {
stringComplete = true;
}
}
if (stringComplete) {
Serial.printf("inputString: %s \n", inputString);
inputString = "";
stringComplete = false;
}
}
In loop(), determine whether the serial port has data, if so, read and save the data, and if the newline
character is read, print out all the data that has been read.
Reference
String();
Constructs an instance of the String class.
For more information, please visit
https://www.arduino.cc/reference/en/language/variables/data-types/stringobject/
int available(void);
Get the number of bytes (characters) available for reading from the serial port. This is data that’s already
arrived and stored in the serial receive buffer.
Serial.read();
Reads incoming serial data.

Freenove ESP32-S3 Specifications

General

Microcontroller	ESP32-S3
Clock Speed	240 MHz
SRAM	512 KB
Flash Memory	8MB
PSRAM	8 MB
Bluetooth	Bluetooth 5, Bluetooth Mesh
Operating Voltage	3.3 V
ADC Resolution	12-bit
DAC Resolution	8-bit
CPU	Dual-core Xtensa® 32-bit LX7
Wi-Fi	802.11 b/g/n
USB	USB Type-C

Summary

Important Information

Getting Started

Instructions for initial setup and reading the 'Start Here.pdf' document.

Get Support and Offer Input

Information on obtaining technical support and providing feedback to Freenove.

Safety and Precautions

Essential safety guidelines and warnings for using the product.

About Freenove

Copyright

Preface

ESP32-S3 WROOM Overview

Introduction to the ESP32-S3 microcontroller unit and its features.

CH343 Driver Installation

Guide to installing the CH343 driver for Windows and macOS.

Programming Software Setup

Instructions for installing and setting up the Arduino IDE for programming.

Environment Configuration

Steps to configure the Arduino IDE for ESP32-S3 board support.

Notes for GPIO

Details on strapping pins and their configurations for ESP32-S3.

Chapter 1 LED

Project 1.1 Blink

A project demonstrating how to control an LED to blink using ESP32-S3.

Chapter 2 Serial Communication

Project 2.1 Serial Print

Sending data from ESP32-S3 to a computer via serial communication.

Project 2.2 Serial Read and Write

Receiving data from a computer and sending it to ESP32-S3 via serial.

Chapter 3 Bluetooth

Project 3.1 BLE Data Passthrough

Demonstrates data transmission using Bluetooth Low Energy between ESP32-S3 and mobile phones.

Chapter 4 Read and Write the SDcard

Project 4.1 SDMMC Test

Using ESP32-S3 to read and write data to an SD card via SDMMC interface.

Format SD Card

Guide for formatting an SD card on Windows and macOS systems.

Chapter 5 WiFi Working Modes

Project 5.1 Station Mode

Configuring ESP32-S3 to connect to a WiFi router as a client.

Project 5.2 AP Mode

Setting up ESP32-S3 to act as a WiFi Access Point (hotspot).

Project 5.3 AP+Station Mode

Enabling ESP32-S3 to operate as both a WiFi client and Access Point simultaneously.

Chapter 6 TCP/IP

Project 6.1 As Client

Using ESP32-S3 as a TCP client to connect to a server on the same LAN.

Project 6.2 As Server

Using ESP32-S3 as a TCP server to accept client connections.

Chapter 7 Camera Web Server

Project 7.1 Camera Web Server

Accessing ESP32-S3 camera stream via a web browser.

Project 7.2 Video Web Server

Viewing real-time video data from ESP32-S3 camera via web pages.

Project 7.3 Camera and SDcard

Capturing photos with ESP32-S3 camera and saving them to an SD card.

Chapter 8 Camera Tcp Server

Project 8.1 Camera Tcp Server

Displaying ESP32-S3 camera video data on a mobile phone.

What's next?

End of the Tutorial

Concluding remarks and contact information for further assistance.