ESP32 Formats and Communication

ISBN-13: 9781484293782 / Angielski / Miękka / 2023

Neil Cameron

Opis

Although Wi-Fi communication is incorporated in many internet-based applications, knowledge of alternative communication protocols is vital for optimal project development with a microcontroller, such as the ESP32. This book focuses on communication protocols for the ESP32 microcontroller with illustrative projects ranging from a Bluetooth Low Energy beacon communicating with your smart wristwatch to Long Range (LoRa) communication between microsatellites circling 550km above the Earth and an ESP32 microcontroller in your home. Just as there are different communication protocols, there are different ESP32 microcontroller formats. You’ll examine the features of several ESP32 microcontroller formats, which enable the optimal combination of communication protocol and ESP32 format to achieve the requirements of a project. Several of the communication protocols and ESP32 formats have only been available in the last few months or years, making the book very relevant.Each chapter focuses on a communication protocol and is stand-alone, so they can be read without having to start from the beginning of the book. The chapters are loosely grouped into short- and long-range communication, image management for transmission to a webpage or a remote LCD screen, and the required apps and IoT techniques for remote control of an ESP32-CAM robot vehicle. The advantages of each communication protocol correspond to different project types.What You'll Learn

• Study the MESH communication protocol and the ESP-NOW protocol with communication between ESP32 microcontrollers without a Wi-Fi connection
• Review email communication projects with an ESP32 and generation of quick response codes to instruct an ESP32 to control a connected device.
• Look at the ESP32-CAM module built around a 2M-pixel camera for streaming images with the WebSocket protocol to a remote ESP32
• Control an ESP32-CAM robot car through remote communication over the internet with image streaming to an Android tablet or mobile phone.

Who This Book Is For

Spis treści

PREFACE

CHAPTER 1: ESP32 MICROCONTROLLER

USB to UART driver installation  

Arduino IDE Boards Manager esp32 version 2.0.N             

ESP32 DEVKIT DOIT        

TTGO T-Display V1.1       

Pulse width modulation

Analog to digital conversion       

TTGO LoRa32 V2.1 1.6   

TTGO T-Watch V2            

TTGO T-Watch installation           

M5Stack Core2 

M5Stack Core2 installation          

M5Stack Core2 and sound           

M5Stack Core2 M5G0 battery base         

ESP32-CAM       

ESP32-CAM-MB module

ESP32-CAM-CH340 module        

Image resolution             

Memory             

Over The Air (OTA)         

Software versions           

 

CHAPTER: 2 I2S AUDIO 

Analog to digital               

Direct Memory Access  

PDM microphone            

Fast Fourier Transform 

Digital to analog               

PCM5102 decoder module         

MAX98357 decoder module       

Internet radio   

Internet radio with ESP32 module           

Internet radio with M5Stack Core2          

Audio data and Bluetooth           

ESP32 to Bluetooth speaker       

MP3 player        

Play MP3 files from micro-SD card           

Play MP3 files with M5Stack Core2          

 

CHAPTER 3 : MESH COMMUNICATION 

ESP-MESH          

ESP-MESH and one Bluetooth device      

ESP-MESH and several Bluetooth devices             

 

CHAPTER 4: TTGO T-WATCH V2

TTGO T-watch functionality        

Configuration file            

Main sketch      

Default display screen   

Application menu           

Screen brightness           

GPS information              

GPS satellite map            

Bluetooth communication           

Infrared signalling           

Synchronisation with Network Time Protocol      

Source OpenWeatherMap API data        

Step counter and distance measure        

Timer   

Battery voltage and microcontroller temperature            

Data storage on micro-SD card  

Temperature, current and screen brightness      

GPS tracking data            

 

CHAPTER 5: BLE BEACONS          

Eddystone beacons

Eddystone URL beacon

Eddystone TLM beacon

Eddystone UID beacon

iBeacon

Beacon raw data              

BLE communication       

GATT profile      

Two-way communication            

Notifications

nRF24L01 module as BLE transceiver

 

CHAPTER 6: LORA AND MICROSATELLITES

ESP32 as LoRa transmitter or receiver

ESP32 and LoRa satellites            

Installation and configuration    

Test station configuration and test message       

Microsatellite tracking  

 

CHAPTER 7: EMAIL AND QR CODES         

email    

QR codes            

XML HTTP request          

QR codes and XML HTTP request             

QR codes and WebSocket           

 

CHAPTER 8: WEBSOCKET, WEBSERIAL AND WEBDASHBOARD    

WebSocket        

WebSerial          

Web Dashboard               

 

CHAPTER 9: MQTT          

Smart meter     

MQTT and smart meter

Wi-Fi connection to router          

ESP-NOW, MQTT and smart meter          

Updating time  

Wi-Fi or Wi-Fi and ESP-NOW      

CO2 and TVOC  

CO2 and TVOC with MQTT           

 

CHAPTER 10: MANAGING IMAGES         

Image bitmap   

Display black and white image   

Display colour image     

Bitmap and X bitmap     

Send image in email       

Store image file in SPIFFS             

Image URL in sketch       

Display image as Sprite 

LCD screen         

M5Stack Core2 and accelerometer          

Memory requirements 

Display time with Sprites             

Extension to M5Stack Core2       

Compress HTML code   

 

CHAPTER 11: ESP32-CAM CAMERA         

Stream images direct to LCD screen        

Stream images to remote LCD screen     

Stream images over Wi-Fi            

Webpage with control functions              

WebSocket        

esp_http_server             

Webpage with image streaming and control functions    

ESP32-CAM image resolution     

 

CHAPTER 12: CONTROL APPS    

app to display a webpage            

app to display streamed images

app to transmit and receive data              

app with image streaming and control functions

app sliders         

Circular slider    

Vertical slider    

Horizontal slider touchdown and touchup            

app to control WS2812 RGB LED

Bluetooth communication           

Wi-Fi communication

 

CHAPTER 13: REMOTE CONTROL MOTORS          

Servo motor      

ledc function     

ESP32Servo library          

app to control servo motor         

DC motors          

TB6612FNG motor driver board

L298N motor driver board           

Motor driver control      

app to control DC motors with heading angle

 

CHAPTER 14: REMOTE CONTROL ESP32-CAM ROBOT CAR

app with direction buttons         

app with heading angle control 

CHAPTER 15 LIBRARIES 

TFT-eSPI library

Libraries used   

Create a library 

Source file          

Header file         

Keyword file      

Information file

O autorze

​Neil Cameron is an experienced analyst and programmer with a deep interest in understanding the application of electronics. Neil wrote the books Arduino Applied: Comprehensive Projects for Everyday Electronics and Electronics Projects with the ESP8266 and ESP32: Building Web Pages, Applications, and WiFi Enabled Devices, which are published by Apress. He has previously taught at University of Edinburgh and Cornell University.   

Blurb

Although Wi-Fi communication is incorporated in many internet-based applications, knowledge of alternative communication protocols is vital for optimal project development with a microcontroller, such as the ESP32. This book focuses on communication protocols for the ESP32 microcontroller with illustrative projects ranging from a Bluetooth Low Energy beacon communicating with your smart wristwatch to Long Range (LoRa) communication between microsatellites circling 550km above the Earth and an ESP32 microcontroller in your home.

Just as there are different communication protocols, there are different ESP32 microcontroller formats. You’ll examine the features of several ESP32 microcontroller formats, which enable the optimal combination of communication protocol and ESP32 format to achieve the requirements of a project. Several of the communication protocols and ESP32 formats have only been available in the last few months or years, making the book very relevant.

Each chapter focuses on a communication protocol and is stand-alone, so they can be read without having to start from the beginning of the book. The chapters are loosely grouped into short- and long-range communication, image management for transmission to a webpage or a remote LCD screen, and the required apps and IoT techniques for remote control of an ESP32-CAM robot vehicle. The advantages of each communication protocol correspond to different project types.

You will:

• Study the MESH communication and the ESP-NOW protocols with communication between ESP32 microcontrollers without a Wi-Fi connection
• Review email communication projects with a generation of quick response codes to instruct an ESP32 to control a connected device
• Look at the ESP32-CAM module built around a 2M-pixel camera for streaming images with the WebSocket protocol to a remote ESP32
• Control an ESP32-CAM robot car through remote communication over the internet with image streaming to an Android tablet or mobile phone.