ESP32-S3-POE-ETH-8DI-8DO
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Introduction
Introduction
ESP32-S3-POE-ETH-8DI-8DO is an industrial-grade device based on the ESP32-S3 microcontroller, supporting WiFi, Bluetooth, RS485, CAN, and Ethernet interfaces, and featuring 8 digital input and 8 digital output channels over WiFi network. It has built-in protection circuits such as power supply isolation and optocoupler 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
- The output utilizes Darlington transistors with optocoupler isolation, provides stronger driving capability with up to 500mA sink current, and built-in freewheeling diode protection
- The digital inputs feature bidirectional optocoupler isolation, supporting both passive and active switch inputs. The digital outputs can be controlled via a switch interlock (linkage) mode
- Onboard isolated RS485 interface, for connecting to various RS485 Modbus industrial modules or sensors
- Onboard isolated CAN interface, for connecting to various CAN devices
- Onboard pin header, allowing access to other devices
- 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 RTC clock chip, supports timing tasks
- Onboard W5500 Ethernet chip, extending 10/100Mbps network connectivity via SPI interface
- Onboard PoE module for Power over Ethernet (IEEE 802.3af compliant)
- Onboard optocoupler isolation to avoid external circuit interference with the control chip
- 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
- Onboard TF card slot, supporting external TF card storage for pictures or files
- Onboard buzzer, RGB light, power supply, RS485 TX/RX indicator and CAN indicator for easy sensing of the operating status of the device
- Rail-mounted ABS protective enclosure, easy to install, safe to use
Specifications
| Item | Parameter |
| Supply voltage | 7~36V (or 5V/1A Type-C port) |
| Digital output channels | 8 channels |
| Digital input channels | 8 channels |
| Wiring port | Type-C |
| Communication protocol | USB protocol |
| Dimensions | 90 (H) x 175 (V) (mm) |
Interfaces
- Digital Output
| Control EXIO | Function |
| EXIO1 | Control pin for No. 1 digital output |
| EXIO2 | Control pin for No. 2 digital output |
| EXIO3 | Control pin for No. 3 digital output |
| EXIO4 | Control pin for No. 4 digital output |
| EXIO5 | Control pin for No. 5 digital output |
| EXIO6 | Control pin for No. 6 digital output |
| EXIO7 | Control pin for No. 7 digital output |
| EXIO8 | Control pin for No. 8 digital output |
- Digital Input
| Control EXIO | Function |
| GPIO4 | Detection pin for No. 1 digital input |
| GPIO5 | Detection pin for No. 2 digital input |
| GPIO6 | Detection pin for No. 3 digital input |
| GPIO7 | Detection pin for No. 4 digital input |
| GPIO8 | Detection pin for No. 5 digital input |
| GPIO9 | Detection pin for No. 6 digital input |
| GPIO10 | Detection pin for No. 7 digital input |
| GPIO11 | Detection pin for No. 8 digital input |
- W5500 Ethernet chip
| Control GPIO | Function |
| GPIO12 | ETH_INT |
| GPIO13 | ETH_MOSI |
| GPIO14 | ETH_MISO |
| GPIO15 | ETH_SCLK |
| GPIO16 | ETH_CS |
| GPIO39 | ETH_RST |
- TF Card
| Control GPIO | Function |
| GPIO45 | SD_D0 |
| GPIO47 | SD_CMD |
| GPIO48 | SD_SCK |
| NC | SD_D3 |
| NC | SD_D1 |
| NC | SD_D2 |
- RS485
| Control GPIO | Function |
| GPIO17 | RS485 TX pin, corresponding to UART TX pin |
| GPIO18 | RS485 RX pin, corresponding to UART RX pin |
| GPIO21 | RS485 RTS pin, corresponding to UART RTS pin |
- CAN
| Control GPIO | Function |
| GPIO2 | CAN TX pin, corresponding to TWAI TX pin |
| GPIO3 | CAN RX pin, corresponding to TWAI RX pin |
- RTC
| Control GPIO | Function |
| GPIO40 | RTC_INT, interrupt pin of RTC chip |
| GPIO41 | RTC_SCL, I2C clock line |
| GPIO42 | RTC_SDA, I2C data line |
- RGB light beads
| Control GPIO | Function |
| GPIO38 | RGB control pin |
- Buzzer
| Control GPIO | Function |
| GPIO46 | Buzzer control pin |
- BOOT button
| Control GPIO | Function |
| GPIO0 | BOOT button control pin |
Dimensions
Electrical and Relay Safety Instructions
- This product must be operated by professional electricians or qualified personnel. During use, ensure electrical safety, leakage protection, and proper insulation.
- Before installing, maintaining, or replacing the relay device, always turn off the power and unplug the device.
- Do not attempt to disassemble the relay device to avoid damage or the risk of electric shock.
- Properly install and place the relay device. Do not use it in humid, overheated, flammable, or explosive environments to prevent accidents caused by improper installation or use.
1. Load Matching
- Ensure the relay's rated voltage and current match the load. Do not exceed the rated capacity.
- For inductive loads (motors, coils, lamps, etc.), the starting current may be much higher than the rated current. Choose a relay with sufficient current margin.
2. Short Circuit and Overcurrent Protection
- Install a fuse or circuit breaker in the relay circuit to prevent damage due to short circuits or accidental overcurrent.
- Ensure the load circuit has no short circuits during wiring, and select protection components with appropriate current ratings if necessary.
3. Arc and Switching Protection
- Relay switching generates arcs, which can cause contact wear or welding.
- For inductive loads, it is recommended to use RC snubber circuits or varistors for arc suppression.
4. Installation Environment
- Do not use the relay in humid, high-temperature, flammable, explosive, or dusty environments.
- Install the relay securely to avoid vibrations or shocks that may cause misoperation or damage.
5. Power-Off Operation
- Always cut off power before maintenance, wiring, or replacing the relay to ensure personnel and device safety.
- Latching relays are only powered when changing state. Avoid strong vibrations or strong magnetic fields while the relay is unpowered.
6. Status Confirmation
- After powering on, confirm or reset the relay status as needed to prevent abnormal operation caused by transportation, installation, or external disturbances.
- Avoid power interruption during relay operation to prevent uncertain status or contact damage.
7. Regular Inspection
- Periodically inspect relay contacts, terminals, and insulation to ensure proper operation.
- If abnormal heating, odor, or burn marks are detected, immediately cut off power and replace the relay.
8. Product USB-OTG Jumper
- This jumper is used to supply power externally via Type-C. Please note, DO NOT connect to the computer when switching to USB-OTG!!!
Implementation Logic
Usage Guide
ESP32-S3-POE-ETH-8DI-8DO currently provides the Arduino IDE development tool and framework.
Development Tool
 |
Arduino IDEArduino 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
- ESP32-S3-POE-ETH-8DI-8DO x1
- USB cable (Type-A male to Type-C male) x1
- Modbus RTU Relay x 1
- USB TO RS232/485 x 1
- USB-CAN-A x 1
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.
Environment Setup
Download and Install Arduino IDE
- Click to visit the Arduino official website, select the corresponding system and system bit to download
- 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
| 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-POE-ETH-8DI-8DO library file is stored in the demo, click here to jump: ESP32-S3-POE-ETH-8DI-8DO Demo
| 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
- 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, clickSave
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.
- If the ESP32S3 mainboard only has a USB port, you need to enable USB CDC, as shown in the following diagram:
- Compile and upload the program:
①. Compile the program; ②. Compile and download the program; ③. Download successful.
- Open the Serial Monitor window, and the demo will print "Hello World!" every 2 seconds, and the operation is as follows:
Demo
| Demo | Basic demo description | Dependency library |
|---|---|---|
| 01_MAIN_WIFI_AP | RS485 interface control, 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 | RS485 interface control, 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_ALL | RS485 interface control, 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
01_MAIN_WIFI_AP
Demo description
- This example implements the control of 8 relays on and off through WiFi, Bluetooth, network port and RS485. 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, or RS485 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
switchstatement to perform different operations based on the value ofbuf[0]:- For the cases from
CH1toCH8, thedigitalTogglefunction is used to switch the level states of the corresponding EXIO pins (such asGPIO_PIN_CH1, etc.), and the corresponding elements of theRelay_Flagarray are updated to record the change in relay status. TheBuzzer_PWMfunction 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_ONcommand, set all GPIO pins (corresponding to 8 channel relays) to high level (on state), use thememsetfunction to set all elements of theRelay_Flagarray to 1, indicating that all relays are turned on, output all relay ON prompt information, and control the buzzer. - For the
ALL_OFFcommand, set all relevant GPIO pins to low level (off state) similarly, update theRelay_Flagarray 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.
- For the cases from
- First output the corresponding data source prompt message according to the value of
- Parameter analysis
- 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 throughWiFi.softAP(ssid, password). If it fails, it will loop through prompt and retry until it succeeds
- First set the Wi-Fi mode to
- 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
ipStrand output it for easy network address recognition
- Obtain and format the IP address of the soft AP, store it in
- Web server setting
- Set up corresponding request handling functions (such as
handleRoot,handleGetData, etc.) for multiple paths (such as "/", "/getData", etc.) throughserver.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.
- Set up corresponding request handling functions (such as
- AP creation
02_MAIN_WIFI_STA
Demo description
- This example implements the control of 8 relays on and off through WiFi, Bluetooth, and RS485. 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_STAmode 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.
- First set Wi-Fi to
- Operations after successful connection:
- If the number of connection attempts is less than 23 (i.e. successful connection), set
WIFI_Connectionto 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.
- If the number of connection attempts is less than 23 (i.e. successful connection), set
- Operations after connection failure:
- If the number of attempts is greater than or equal to 23 (connection failure), set
WIFI_Connectionto 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
- If the number of attempts is greater than or equal to 23 (connection failure), set
- Attempt to connect to Wi-Fi network:
03_MAIN_MQTT_ALL
Demo description
- This example is a collection of RS485 interface control, 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
External Expansions
RS485 Extended Relay Channels
- Use Modbus RTU Relay to extend 8-ch relay
- The 4 main example files are compatible with this operation, and the Extension_Enable in WS_imformification. h needs to be set to 1 (default is 1)
- Externally extended relays can be controlled via Bluetooth
Operation Command Command Function 06 01 Switch the CH1 relay status of Modbus RTU Relay 06 02 Switch the CH2 relay status of Modbus RTU Relay 06 03 Switch the CH3 relay status of Modbus RTU Relay 06 04 Switch the CH4 relay status of Modbus RTU Relay 06 05 Switch the CH5 relay status of Modbus RTU Relay 06 06 Switch the CH6 relay status of Modbus RTU Relay 06 07 Switch the CH7 relay status of Modbus RTU Relay 06 08 Switch the CH8 relay status of Modbus RTU Relay 06 09 Turn on all relays of Modbus RTU Relay 06 0A Turn off all relays of Modbus RTU Relay
- The commands for Bluetooth control relay are characters 1-8, which are hexadecimal 0x06 0x01 ~ 0x38 0x0A
- Click the SEND button and fill in the data to be sent (currently hexadecimal sending), enter 0x06 0x01 as below
- Send 0x06 0x01 to control relay CH1 for status reversal
- Send 0x06 0x0A to control to turn off all relays
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-8DO-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
Port Description
Resources
Demo
Datasheets
ESP32-S3
Software Tools
Arduino
VScode
Thonny
Debugging Tools
Other Resource Links
Project Resources
This section features third - party project resources. We merely provide links and bear no responsibility for content updates or maintenance. Thank you for your understanding.
Volos Projects ESP32 + Smartwatch = Smart Home Control!
- Youtube: https://www.youtube.com/watch?v=pLcABak9Scc
- Github: https://github.com/VolosR/waveshareControl
Smarty Van - Home Assistant Van Autopsy — What's Really Inside
- Youtube: https://www.youtube.com/watch?v=luIYpYWIufQ
- Github: https://github.com/geerlingguy/mini-rack
FAQ
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.
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.
Answer:
- It's normal for the first compilation to be slow, just be patient
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
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"
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.
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.
Answer:
- The device address is 0x20.
Answer:
- The factory demo is for learning only, if it is used for practical application, please optimize the demo logic by yourself.
Answer:
- Please move the jumper cap to 120R and try again. Some RS485 devices require a 120R resistor to be connected in series
Support
Technical Support
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