ESP32-S3-ETH-8DI-8RO-C

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ESP32-S3-ETH-8DI-8RO-C
ESP32-S3-ETH-8DI-8RO-C

8-ch, WiFi/CAN/USB
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Introduction

Introduction

ESP32-S3-ETH-8DI-8RO-C is an industrial-grade 8-channel WiFi network relay based on ESP32-S3 main controller and supports WiFi, Bluetooth, CAN, network port and other peripheral interfaces. It has built-in protection circuits such as power supply isolation and optodecoupler isolation, which is safe, stable and reliable, and suitable for the AIoT field.

Features

  • Based on ESP32-S3 microcontroller with Xtensa 32-bit LX7 dual-core processor with frequency up to 240MHz
  • Integrated 2.4GHz WiFi and Bluetooth LE dual-mode wireless communication, with superior RF performance
  • High quality relay, contact rating: ≤10A 250V AC or ≤10A 30V DC
  • Onboard isolated CAN interface, for connecting to various CAN expansion modules or sensors
  • Onboard GPIO pin header interface, for expand other devices such as RS232 / sensor and other functions
  • Onboard USB Type-C port for power supply, firmware downloading and debugging, making development more convenient
  • Onboard power supply screw terminal, supports 7~36V wide voltage input, suitable for industrial applications
  • Onboard optocoupler isolation to prevent interference with control chip from external high-voltage circuit connected to the relay
  • Onboard digital isolation to avoid external signal interference with the control chip
  • Onboard integrated power isolation, providing stable isolation voltage, no extra power supply required for the isolated terminal
  • Built-in buzzer, RGB colorful LED, power supply and CAN TX/RX indicators for monitoring the operating status of the module
  • Rail-mounted ABS protective enclosure, easy to install, safe to use

Specifications

Item Parameter
Supply voltage 7~36V (or 5V/1A Type-C port)
Relay channels 8 channels
Digital input channels 8 channels
Contact Form 1NO 1NC
Wiring port Type-C
Communication protocol USB protocol
Dimensions 90 (H) x 175 (V) (mm)

Onboard Resources

ESP32-S3-ETH-8DI-8RO-C-details-inter.jpg

1. ESP32-S3
   Up to 240MHz operating frequency, with 2.4GHz WiFi and BLE

2. High-quality relay
   Contact rating per channel: ≤10A 250V AC or ≤10A 30V DC

3. Optocoupler isolation
   Prevents interference with the control chip from external high-voltage circuit connected to the relay

4. RESET button

5. PoE port
   Can be connected to PoE module (PoE port version only)

6. BOOT button

7. Power chip

8. Digital isolation
   Prevents interference with the control chip from external signal

9. Power isolation
   Provides a stable isolation voltage, needs no extra power supply for the isolated terminal

10. Bidirectional optocoupler isolation

11. RTC battery header

12. Buzzer

13. Digital input interface

14. Pin header interface
   Can be connected to other devices

15. Operating status indicator
   PWR: Power indicator
   RXD: CAN RX indicator
   TXD: CAN TX indicator

16. USB Type-C interface
   For module power supply, firmware downloading and USB communication

17. WS2812 RGB colorful LED
   Controllable via GPIO38 pin

18. Network port

19. External antenna socket
   SMA female connector, for WiFi and Bluetooth wireless communication

20. Power supply screw terminal
   Supports 7~36V DC wide voltage range power supply

21. CAN communication interface
   Supports connecting external CAN devices

22. CAN matching resistor
   Onboard reserved 120R matching resistor, enabled via jumper

23. Relay screw terminal
   Convenient for users to connect devices

ESP32-S3-ETH-8DI-8RO-C-details-inter-1.jpg

24. Onboard TVS (Transient voltage suppressor)
   Effectively suppresses surge voltage and transient spike voltage in the circuit

25. CAN conversion chip

26. MP1605GTF-Z
   DC-DC power module

27. PCF85063ATL
   RTC chip for some timed tasks

28. TCA9554PWR
   Expands IO for relay control

29. W5500
   Expands 10/100Mbps network connection via SPI interface

30. TF card slot
   Supports external TF card storage for images and files

Interfaces

ESP32-S3-ETH-8DI-8RO-C-details-11.jpg

  • Relay
Control EXIO Function
EXIO1 Relay 1 control pin
EXIO2 Relay 2 control pin
EXIO3 Relay 3 control pin
EXIO4 Relay 4 control pin
EXIO5 Relay 5 control pin
EXIO6 Relay 6 control pin
EXIO7 Relay 7 control pin
EXIO8 Relay 8 control pin
  • W5500 network port chip
Control GPIO Function
GPIO12 ETH_INT
GPIO13 ETH_MOSI
GPIO14 ETH_MISO
GPIO15 ETH_SCLK
GPIO16 ETH_CS
  • TF Card
Control GPIO Function
GPIO45 MISO
GPIO47 MOSI
GPIO48 SCLK
NC CS
NC SD_D1
NC SD_D2
  • CAN
Control GPIO Function
GPIO17 CAN TX pin, corresponding to TWAI
GPIO18 CAN RX pin, corresponding to TWAI
  • RTC
Control GPIO Function
GPIO41 RTC_SCL, SCL (Serial clock line)
GPIO42 RTC_SDA, SDA (Serial data line)
  • RGB light beads
Control GPIO Function
GPIO38 RGB control pin
  • 19. Buzzer
Control GPIO Function
GPIO46 Buzzer control pin
  • BOOT button
Control GPIO Function
GPIO0 BOOT button control pin

Dimensions

ESP32-S3-ETH-8DI-8RO-C-details-size-1.jpg

Electrical Safety Precautions

  • This product should be operated and used by professional electricians or technical personnel. During use, please ensure electrical safety and take protective measures such as anti-leakage and insulation.
  • Before installing, maintaining, or replacing relay equipment, make sure to turn off the power and unplug the device.
  • Do not attempt to dismantle relay equipment to avoid damaging the device or risking electric shock.
  • Please properly install and place the relay equipment. Avoid using it in damp, overly hot, or flammable environments to prevent safety accidents due to improper installation or use.

Version Description

This development board includes both common network port and POE Ethernet port versions. Please click on the corresponding product to view the usage instructions.
ESP32-S3-ETH-8DI-8RO-C ESP32-S3-POE-ETH-8DI-8RO-C
ESP32-S3-ETH-8DI-8RO-C
Common network port 		ESP32-S3-POE-ETH-8DI-8RO-C
POE Ethernet port

Note: When transmitting data via CAN, a frame is only considered complete after looping back to itself. Therefore, during data transmission, both the TX (green light) and RX (blue light) indicator lights may flash simultaneously, which is normal behavior.

Usage Instructions

ESP32-S3-ETH-8DI-8RO-C currently provides the Arduino IDE development tool and framework.

Development Tool

270px-Arduino-IDE-logo.jpg

Arduino IDE

Arduino IDE is an open source electronic prototyping platform, convenient and flexible, easy to get started. After a simple learning, you can start to develop quickly. At the same time, Arduino has a large global user community, providing an abundance of open source code, project examples and tutorials, as well as rich library resources, encapsulating complex functions, allowing developers to quickly implement various functions.


Each of these two development approaches has its own advantages, and developers can choose according to their needs and skill levels. Arduino and MicroPython are suitable for beginners and non-professionals because they are easy to learn and quick to get started.

Components Preparation

Before operating, it is recommended to browse the table of contents to quickly understand the document structure. For smooth operation, please read the FAQ carefully to understand possible problems in advance. All resources in the document are provided with hyperlinks for easy download.

Working with Arduino

This chapter introduces setting up the Arduino environment, including the Arduino IDE, management of ESP32 boards, installation of related libraries, program compilation and downloading, as well as testing demos. It aims to help users master the development board and facilitate secondary development.
Arduino-flow-04.png

Environment Setup

Download and Install Arduino IDE

  • Click to visit the Arduino official website, select the corresponding system and system bit to download
    ESP32-S3-AMOLED-1.91-Ar-software-01.png
  • Run the installer and install all by default

Install ESP32 Development Board

  • Regarding ESP32-related motherboards used with the Arduino IDE, the esp32 by Espressif Systems library must be installed first.
  • According to Board installation requirement, it is generally recommended to use Install Online. If online installation fails, use Install Offline
  • For the installation tutorial, please refer to Arduino board manager tutorial
  • ESP32-S3-ETH-8DI-8RO-C required development board installation description
Board name Board installation requirement Version number requirement
esp32 by Espressif Systems "Install Offline" / "Install Online" 3.0.0 and above

Install Library

  • When installing Arduino libraries, there are usually two ways to choose from: Install online and Install offline. If the library installation requires offline installation, you must use the provided library file
    For most libraries, users can easily search and install them through the online library manager of the Arduino software. However, some open-source libraries or custom libraries are not synchronized to the Arduino Library Manager, so they cannot be acquired through online searches. In this case, users can only manually install these libraries offline.
  • For library installation tutorial, please refer to Arduino library manager tutorial
  • ESP32-S3-ETH-8DI-8RO-C library file is stored in the demo, click here to jump: ESP32-S3-ETH-8DI-8RO-C Demo
  • ESP32-S3-ETH-8DI-8RO-C library file installation description
Library Name Description Version Library Installation Requirement
ArduinoJson Lightweight JSON library v6.21.4 "Install Online" or "Install Offline"
PubSubClient MQTT message subscription publishing library v2.8.0 "Install Online" or "Install Offline"
NTPClient Network time synchronization client library v3.2.1 "Install Online" or "Install Offline"
For more learning and use of LVGL, please refer to LVGL official documentation

Run the First Arduino Demo

If you are just getting started with ESP32 and Arduino, and you don't know how to create, compile, flash, and run Arduino ESP32 programs, then please expand and take a look. Hope it can help you!

New Project

  • Run the Arduino IDE and select File -> New Sketch
    ESP32-S3-AMOLED-1.91-Ar-study-01.png
  • Enter the code:
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
}

void loop() {
  // put your main code here, to run repeatedly:
  Serial.println("Hello, World!");
  delay(2000);
}
  • Save the project and select File -> Save As.... In the pop-up menu, select the path to save the project, and enter a project name, such as Hello_World, click Save

ESP32-S3-AMOLED-1.91-Ar-study-02.png

Compile and Flash Demos

  • Select the corresponding development board, take the ESP32S3 motherboard as an example:

①. Click to select the dropdown menu option Select Other Board and Port;
②. Search for the required development board model esp32s3 dev module and select;
③. Select COM Port;
④. Save the selection.
ESP32-S3-AMOLED-1.91-Ar-study-03.png

  • Some development boards with specified version numbers support direct model selection, for example, "Waveshare ESP32-S3-LCD-1.69":

ESP32-S3-AMOLED-1.91-Ar-study-07.png

  • If the ESP32S3 mainboard only has a USB port, you need to enable USB CDC, as shown in the following diagram:

ESP32-S3-AMOLED-1.91-Ar-study-04.png

  • Compile and upload the program:

①. Compile the program; ②. Compile and download the program; ③. Download successful.
ESP32-S3-AMOLED-1.91-Ar-study-05.png

  • Open the Serial Monitor window, and the demo will print "Hello World!" every 2 seconds, and the operation is as follows:

ESP32-S3-AMOLED-1.91-Ar-study-06.png

Demo

Demo-flow-01.png

  • ESP32-S3-ETH-8DI-8RO-C demos
Demo Basic Description Dependency Library
01_MAIN_WIFI_AP Bluetooth control, Bluetooth send IP, Web page control (short distance) Can be flashed directly
Web pages are only available if they are connected to device WIFI
02_MAIN_WIFI_STA Bluetooth control, Bluetooth send IP, Web page control (short distance) Need to modify the WIFI to be connected
Web pages can only be used within the intranet
03_MAIN_WIFI_MQTT Bluetooth control, Bluetooth transmit IP, Waveshare cloud control (long distance) Need to modify the WIFI to be connected
The device must be created in the Waveshare cloud
04_MAIN_ALL Bluetooth control, Bluetooth send IP, Web page control (short distance), Waveshare cloud control (long distance) Need to modify the WIFI to be connected
The device must be created in the Waveshare cloud
Web pages can only be used within the intranet

Arduino Project Parameter Setting

ESP32-S3-16MB-OPI-Parameters.png

01_MAIN_WIFI_AP

Demo description

  • This example implements the control of 8 relays on and off through WiFi, Bluetooth, and network port. The AP mode of WiFi is enabled in this example

Precautions

  • Can be flashed directly
  • The web page can only be accessed by connecting to the device's WIFI, or if connected to a network cable, by accessing the network port IP within the internal network

Code analysis

  • Relay_Analysis(): This function is mainly used to analyze received data, perform corresponding relay control operations based on the data content, and output corresponding status prompt information.
    • Parameter analysis
      • uint8_t *buf: A pointer to an unsigned 8-bit integer array, which is supposed to store the received data, and the function determines the content of the command based on the value of the first element (buf[0]) of the array.
      • uint8_t Mode_Flag: The mode flag is used to represent the data source, and the corresponding data source prompt information (such as Bluetooth data, Wi-Fi data) is output by judging this flag, and different relay operations are performed according to different commands.
    • Logical flow
      • First output the corresponding data source prompt message according to the value of Mode_Flag.
      • Then use the switch statement to perform different operations based on the value of buf[0]:
        • For the cases from CH1 to CH8, the digitalToggle function is used to switch the level states of the corresponding GPIO pins (such as GPIO_PIN_CH1, etc.), and the corresponding elements of the Relay_Flag array are updated to record the change in relay status. The Buzzer_PWM function is called to control the buzzer, and the corresponding on or off prompt information is output according to the final state of the relay.
        • For the ALL_ON command, set all GPIO pins (corresponding to 8 channel relays) to high level (on state), use the memset function to set all elements of the Relay_Flag array to 1, indicating that all relays are turned on, output all relay ON prompt information, and control the buzzer.
        • For the ALL_OFF command, set all relevant GPIO pins to low level (off state) similarly, update the Relay_Flag array elements to 0, output a message that all relays are turned off and control the buzzer, and perform two additional buzzer control operations (with a delay in between).
        • If the value of buf[0] does not belong to the above command cases, a prompt message for non-instruction data is output.
  • WIFI_Init (): Configure the device as a Wi-Fi access point (AP), set up a Web server, and set up request processing functions corresponding to different paths to implement related network functions and device control functions, and give corresponding status prompts.
    • AP creation
      • First set the Wi-Fi mode to WIFI_AP, and then attempt to create a soft AP through WiFi.softAP(ssid, password). If it fails, it will loop through prompt and retry until it succeeds
    • Parameter configuration and prompts
      • After successfully creating the AP, give a prompt with RGB light (green light on for 1 second)
    • IP address display
      • Obtain and format the IP address of the soft AP, store it in ipStr and output it for easy network address recognition
    • Web server setting
      • Set up corresponding request handling functions (such as handleRoot, handleGetData, etc.) for multiple paths (such as "/", "/getData", etc.) through server.on, each function should be defined elsewhere for different functional operations like returning pages, getting data, controlling switches etc.
      • Finally call server.begin() to start the Web server and output a startup prompt message.

Bluetooth Control

Web Page Control

02_MAIN_WIFI_STA

Demo description

  • This example implements the control of 8 relays on and off through WiFi and Bluetooth. The STA mode of WiFi is enabled in this example

Precautions

  • Need to modify the WIFI to be connected
  • The Web page only supports controlling the device and this product to be used under the same network, if you use the mobile phone control, you need to turn off the mobile network

Code analysis

  • WIFI_Init (): Connect the device to a specified Wi-Fi network in station (STA) mode. If the connection is successful, it will perform subsequent network-related configurations (such as obtaining an IP address, starting a Web server, and registering callback functions, etc.). If the connection fails, it will give a corresponding prompt and set the connection status flag. The process also provides visual connection status indicators through an RGB light
    • Attempt to connect to Wi-Fi network:
      • First set Wi-Fi to WIFI_STA mode and enable sleep mode, then start connecting to the specified network. In the cyclic wait of unsuccessful connection, a point is output as a prompt every half second, and the RGB light briefly turns red on every even number of attempts (except the first attempt). If every 10 attempts fail, the connection is disconnected and reconnected. If the number of attempts exceeds 22, the connection is considered a failure and the loop is exited.
    • Operations after successful connection:
      • If the number of connection attempts is less than 23 (i.e. successful connection), set WIFI_Connection to 1, light up the green light for 1 second to indicate success, and then obtain and display the local IP address. Next, register callback functions corresponding to multiple paths for the web server (such as root path, data retrieval, control of different switches, etc.), and finally start the server and output startup prompt, so that the device can receive corresponding control through the web page.
    • Operations after connection failure:
      • If the number of attempts is greater than or equal to 23 (connection failure), set WIFI_Connection to 0, output a prompt to inform that the device can be controlled through Bluetooth debugging assistant, and light a red light to indicate a connection failure status

Bluetooth Control

Web Page Control

03_MAIN_WIFI_MQTT

Demo description

  • This example controls 8 relays on and off through MQTT and Bluetooth. It uses ESP32 as the main control unit, supports Wi-Fi and Bluetooth connections, and provides remote control based on the MQTT protocol

Precautions

  • Need to modify the WIFI to be connected
  • Must create the device in Waveshare Cloud

Code analysis

  • Relay_Analysis(): Receive data from different communication sources and perform corresponding relay control operations
    • Data Delivery: Commands (such as CH1, ALL_ON etc.) are sent to the device via Bluetooth or Wi-Fi. The device parses and executes the corresponding operation after receiving a command. For example, when the command CH1 is received, the function will switch the state of relay 1
    • Data Feedback: The execution of control commands is printed to the serial monitor via printf (e.g., relay status update: "Relay CH1 on") and fed back via the buzzer Buzzer_PWM). This allows users to see real-time status updates
    • Communication Protocol
      • Bluetooth: Wireless communication with mobile phones or other devices through Bluetooth modules, and the device controls the relay after receiving the command
      • MQTT: Connect to the MQTT server via Wi-Fi, and the device subscribes to a specific topic (such as relay control commands). When a new command is issued, the device receives the message via MQTT and performs relay control
  • setup ()
    • Initialize the various modules required for the system, including serial port, GPIO, RTC, Bluetooth and Wi-Fi (MQTT)
      • Call Bluetooth_Init(), and the device can establish connections with other Bluetooth devices and receive control commands
      • With MQTT_Init(), the device will connect to the Wi-Fi network and be able to communicate with remote servers through the MQTT protocol
    • Time Synchronization
      • If the system is connected to Wi Fi and RTC is enabled, the Acquisition_time() function will synchronize the current time to RTC through the network, ensuring that the device has accurate system time
    • Data Upload and Delivery
      • Upload: When the device successfully connects to Wi Fi or Bluetooth, it can upload device status information or sensor data (such as temperature, humidity) through MQTT. These data will be sent to the MQTT server regularly for other systems or users to view
      • Delivery: The device receives a control command from the MQTT server and performs corresponding actions, such as switching relays on and off or changing configurations

Bluetooth Control

Waveshare Cloud Control

04_MAIN_ALL

Demo description

  • This example is a collection of Bluetooth control, Web page control (near distance), and Waveshare cloud control (long distance)

Precautions

  • Need to modify the WIFI to be connected
  • The Web page only supports controlling the device and this product to be used under the same network, if you use the mobile phone control, you need to turn off the mobile network
  • Must create the device in Waveshare Cloud

Bluetooth Control

Web Page Control

Waveshare Cloud Control

External Expansion

Flash Firmware Flashing and Erasing

  • The current demo provides test firmware, which can be used to test whether the onboard device functions properly by directly flashing the test firmware
  • bin file path: 
    ...\ESP32-S3-POE-ETH-8DI-8RO-C-Demo\Firmware\Factory bin
Flash firmware flashing and erasing for reference

Working with Homeassistant

The product can be controlled online through the Homeassistant built on the Raspberry Pi, and the relevant operations can be found in Reference link

Resources

Demo

Datasheets

ESP32-S3

Software Tools

Arduino

VScode

Thonny

Debugging tool

Other Resource Link

FAQ

Question: After the module downloads the demo and re-downloads it, why sometimes it can't connect to the serial port or the flashing fails?

 Answer:
  • Long press the BOOT button, press RESET at the same time, then release RESET, then release the BOOT button, at this time the module can enter the download mode, which can solve most of the problems that can not be downloaded.


Question: Why does the module keep resetting and flicker when viewed the recognition status from the device manager?

 Answer:
  • It may be due to Flash blank and the USB port is not stable, you can long-press the BOOT button, press RESET at the same time, and then release RESET, and then release the BOOT button, at this time the module can enter the download mode to flash the firmware (demo) to solve the situation.


Question: How to deal with the first compilation of the program being extremely slow?

 Answer:
  • It's normal for the first compilation to be slow, just be patient


Question: How to handle the display "waiting for download..." on the serial port after successfully ESP-IDF flashing?

 Answer:
  • If there is a reset button on the development board, press the reset button; if there is no reset button, please power it on again


Question: What should I do if I can't find the AppData folder?

 Answer:
  • Some AppData folders are hidden by default and can be set to show.
  • English system: Explorer->View->Check "Hidden items"
  • Chinese system: File Explorer -> View -> Display -> Check "Hidden Items"


Question: How do I check the COM port I use?

 Answer:
  • Windows system:

①View through Device Manager: Press the Windows + R keys to open the "Run" dialog box; input devmgmt.msc and press Enter to open the Device Manager; expand the "Ports (COM and LPT)" section, where all COM ports and their current statuses will be listed.
②Use the command prompt to view: Open the Command Prompt (CMD), enter the "mode" command, which will display status information for all COM ports.
③Check hardware connections: If you have already connected external devices to the COM port, the device usually occupies a port number, which can be determined by checking the connected hardware.

  • Linux system:

①Use the dmesg command to view: Open the terminal.
①Use the ls command to view: Enter ls /dev/ttyS* or ls /dev/ttyUSB* to list all serial port devices.
③Use the setserial command to view: Enter setserial -g /dev/ttyS* to view the configuration information of all serial port devices.


Question: Why does the program flashing fail when using a MAC device?

 Answer:


Question: Why is there no output after successfully flashing the code with no issues?

 Answer:
  • Check the schematic diagram for different development boards with Type-C interfaces, and handle the output accordingly:
    • For development boards with direct USB output, printf function is supported for printing output. If you want to support output via the Serial function, you will need to enable the USB CDC On Boot feature or declare HWCDC.
    • For development boards with UART to USB conversion, both printf and Serial functions are supported for printing output, and there is no need to enable USB CDC On Boot.


Question: Please note!

 Answer:
  • The factory demo is for learning only, if it is used for practical application, please optimize the demo logic by yourself.


Question: When controlling other devices using CAN, it is not sensitive or communication fails?

 Answer:
  • Please move the jumper cap to 120R and try again. Some CAN devices require a 120R resistor to be connected in series


Support



Technical Support

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