Lecture

Introduction to ESP32

01 Dec 2023 • Richard Kuo

Introduction to ESP32 chips/boards, Arduino IDE/Toolchains, and ESP32 projects.

Introduction to ESP32 SOCs

ESP32
a dual-core XTensa LX6 MCU, capable of running at 240 MHz with 520 KB of internal SRAM, ntegrated 2.4 GHz, 802.11 b/g/n Wi-Fi and Bluetooth 4.2 (LE) connectivity
ESP32-S3
a dual-core XTensa LX7 MCU, capable of running at 240 MHz. Apart from its 512 KB of internal SRAM, it also comes with integrated 2.4 GHz, 802.11 b/g/n Wi-Fi and Bluetooth 5 (LE) connectivity that provides long-range support.
ESP32-C3
a single-core Wi-Fi and Bluetooth 5 (LE) microcontroller SoC, based on the open-source RISC-V architecture.

ESP32 Interfaces and Peripherals

ESP32-WROOM-32

Insight Into ESP32 Features & Using It With Arduino IDE

Features:

NodeMCU-32S pinout

ESP32-WROOM-32 pinout

ESP32 CAM pinout

ESP32-CAM upload code
ESP-WHO (face detection and recognition)
ESP32-CAM video streaming face recognition
ESP32-CAM video streaming Web server
Code: ESP32-CAM Web server

EPS32 IDE / Toolchains

https://github.com/espressif/arduino-esp32/releases/

ESP32 Arduino IDE

【ESP32專欄】如何安裝及設定ESP32的開發環境

Download Arduino IDE, then Install on PC
Run Arduino
Files>Preferences>Setting> URLs = https://github.com/espressif/arduino-esp32/releases/download/2.0.5/package_esp32_index.json
Tools>Board>Board Managers>ESP32 Arduino> select NodeMCU-32S
Tools>Port> select COM3 or /dev/ttyUSB0
Tools>Manager Libraries…> search packages to install
Sketch>Include Library>Add .ZIP Library…
Download Sample Codes (click Code, then select Download ZIP)
Uncompress arduino-master.zip, store samples folder to ~/Documents/Arduino/
File>Examples> select 01.Basics/Blinky to Verify, then Upload
Press on IO0 (BOOT) button of NodeMCU-32S to upload code
Open Arduino Monitor

ESP32 Toolchains

ESP-IDF
Standard Setup of Toolchain for Windows

run ESP-IDF Installer (556.65MB)
run ESP-IDF Command Prompt / PowerShell
run batch
- cd C:/Users/USER/Desktop/esp-idf>
- install.bat
- export.bat
run menuconfig
- cd examples/get-started/hello_world
- idf.py set-target ESP32
- idf.py menuconfig
build sample code (hello_world)
- cd examples/get-started/hello_world
- idf.py build
- idf.py –p COM3 flash
- idf.py –p COM3 monitor

ESP-IDF using Visual Studio Code

Standard Toolchain Setup for Linux and macOS

Install Prerequisites
Ubuntu & Debian:
sudo apt-get install git wget flex bison gperf python3 python3-pip python3-setuptools cmake ninja-build ccache libffi-dev libssl-dev dfu-util libusb-1.0-0
Get ESP-IDF
mkdir -p ~/esp
cd ~/esp
git clone --recursive https://github.com/espressif/esp-idf.git
Set up the tools
cd ~/esp/esp-idf
./install.sh esp32
For more chips targets:
cd ~/esp/esp-idf
./install.sh esp32,esp32s2
cd ~/esp/esp-idf
./install.sh all
Set up the environment variables
. $HOME/esp/esp-idf/export.sh

Connect Your Device
Serial ports have the following patterns in their names:
Windows: names like COM1
Linux: starting with /dev/ttyUSB0
macOS: starting with /dev/cu
Configure Your Project
For Windows:
cd %userprofile%\esp\hello_world
idf.py set-target esp32
idf.py menuconfig

Linux/macOS:
cd ~/esp/esp-idf/examples/get-started/hello_world
idf.py set-target esp32
idf.py menuconfig

Build the Project
idf.py build
Flash onto the Device
idf.py -p PORT [-b BAUD] flash
Monitor the Output
idf.py -p <PORT> monitor
idf.py -p /dev/ttyUSB0 flash monitor
Erase Flash
idf.py -p /dev/ttyUSB0 erase_flash (need to press IO0 button)

Programming ESP32-S

Connect ESP32-S to FT232R, FT232R connected to PC
sudo chmod 777 /dev/ttyUSB0
Setup ESP-IDF
cd ~/esp/esp-idf
. ./export.sh
A2DP-Sink example code（藍牙音箱）
cd examples/bluetooth/bluedroid/classic_bt/a2dp_sink
menu-configure I2S pins
idf.py menuconfig

A2DP Example Configuration --->press Enter
```
A2DP Sink Output (External I2S Codec) --->
(22) I2S LRCK (WS) GPIO
(26) I2S BCK GPIO
(25) I2S DATA GPIO
```
press S to Save
press Q to Quit
Build code
idf.py build
Upload code to ESP32-S
press & hold IO0 button, then press & hold RESET button
idf.py -p /dev/ttyUSB0 flash
release RESET button, then release IO0 button