ESP32-S3-Relay-6CH

6CH, RS485/Pico/USB

Overview

Introduction

ESP32-S3-Relay-6CH is an industrial-grade 6-channel WiFi network relay based on ESP32-S3 main controller and supports WiFi, Bluetooth, RS485, Pico 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 RS485 interface, for connecting to various RS485 Modbus industrial modules or sensors
Onboard Pico compatible interfaces can be adapted to some Raspberry Pi Pico HAT, for expanding more functions such as RTC / CAN / RS232 / LoRa / sensor, etc.
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 RS485 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	6 channels
Contact Form	1NO 1NC
Wiring port	Type-C
Communication protocol	USB protocol
Dimensions	88 (H) x 122 (V) mm

Onboard Resources

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

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

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

7. Ceramic gas discharge tube

8. Relay screw terminal
Convenient for users to connect devices

9. Compatible Raspberry Pi Pico interface
For connecting to Raspberry Pi Pico HAT

10. RS485 communication interface
Supports connecting external RS485 devices

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

12. Operating status indicator
   PWR: Power indicator
   RXD: RS485 RX indicator
   TXD: RS485 TX indicator

13. WS2812 RGB colorful LED
Controllable via GPIO38 pin

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

15. Passive buzzer
Can control sound frequency via GPIO21 pin

16. RESET button

17. BOOT button

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

19. RS485 matching resistor
Onboard reserved 120R matching resistor, enabled via jumper

20. Relay default control pin setting solder joint

Interfaces

Control GPIO	Function	Description
GP0	BOOT button	BOOT button control pin
GP21	BUZZER	Buzzer control pin
GP38	RGB	RGB light control pin
GP1	CH1	Relay 1 control pin
GP2	CH2	Relay 2 control pin
GP41	CH3	Relay 3 control pin
GP42	CH4	Relay 4 control pin
GP45	CH5	Relay 5 control pin
GP46	CH6	Relay 6 control pin
GP17	TXD	UART TX pin, corresponding to RS485
GP18	RXD	UART RX pin, corresponding to RS485

Dimensions

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.

Usage Instructions

ESP32-S3-Relay-6CH currently provides two development tools and frameworks, Arduino IDE and MicroPython, providing flexible development options, you can choose the right development tool according to your project needs and personal habits.

Development Tools

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.

MicroPython

Micropython is a full implementation of the Python 3 programming language that runs directly on embedded hardware such as ESP32, Raspberry Pi Pico, etc. You can run Python scripts directly on the board through REPL, which is very suitable for rapid prototyping.

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-Relay-6CH x 1
USB cable (Type-A to Type-C) x 1
Modbus RTU Relay x 1
Pico-RTC-DS3231 x 1
USB TO RS232/485 x 1
Pico-2CH-RS232 x 1 or Pico-2CH-RS485 x 1
Pico-CAN-B x 1
USB-CAN-A x 1
Pico-Environment-Sensor 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

ESP32-S3-Relay-6CH required development board installation description
Board name	Board installation requirement	Version number requirement
esp32 by Espressif Systems	"Install Offline" / "Install Online"	2.0.12

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-Relay-6CH library file is stored in the sample program, click here to jump: ESP32-S3-Relay-6CH Demo

ESP32-S3-Relay-6CH 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
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

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.

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

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

ESP32-S3-Relay-6CH Demos
Demo	Basic 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_WIFI_MQTT	RS485 interface control, 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	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 six relay switches through WiFi, Bluetooth, and RS485. The AP mode of WiFi is enabled in this example

Precautions

Can be flashed directly
Web pages are only available if they are connected to device WIFI

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 switch statement to perform different operations based on the value of buf[0]:
    - For the cases from CH1 to CH6, 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 6 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.

RS485 control

Jump to RS485 Control Tutorial

Bluetooth Control

Jump to Bluetooth Control Tutorial

Web Page Control

Jump to Web Control Tutorial, this example is in AP mode

02_MAIN_WIFI_STA

Demo description

This example implements the control of six relay switches 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_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

RS485 control

Jump to RS485 Control Tutorial

Bluetooth Control

Jump to Bluetooth Control Tutorial

Web Page Control

Jump to Web Control Tutorial, this example is in STA mode

03_MAIN_WIFI_MQTT

Demo description

This example controls 6 relays through MQTT, Bluetooth, and RS485 communication methods. 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, Wi-Fi, or RS485. 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
  - RS485: The device receives RS485 commands through the serial port and switches the relay status according to the commands

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

RS485 control

Jump to RS485 Control Tutorial

Bluetooth Control

Jump to Bluetooth Control Tutorial

Waveshare Cloud Control

Jump to Waveshare Cloud Control

04_MAIN_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

RS485 control

Jump to RS485 Control Tutorial

Bluetooth Control

Jump to Bluetooth Control Tutorial

Web Page Control

Jump to Web Control Tutorial, this example is in AP mode

Waveshare Cloud Control

Jump to Waveshare Cloud Control

External Expansion

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

Extend Timer Switch Function with Pico Port

Use Pico-RTC-DS3231 to extend timer switch function
Please make sure that the RTC module time is accurate before connecting to the RTC module or connect the device to wifi to update the RTC module time before you can use the RTC timing function normally
Connect the Pico-RTC-DS3231 device to ESP32-S3-Relay-6CH
The 4 main example files are compatible with this operation, and the RTC_Enable in WS_imformation.h needs to be set to 1 (default is 0, please ensure that it is connected to Pico-RTC-DS3231)

Set the RTC_OPEN_Time_Hour, RTC_OPEN_Time_Min, RTC_Closs_Time_Hour and RTC_Closs_Time_Min to as the operation time

Parameter	Parameter Description
RTC_OPEN_Time_Hour	The time to turn on all relays——hours
RTC_OPEN_Time_Min	The time to turn on all relays——minutes
RTC_Closs_Time_Hour	The time to turn off all relays——hours
RTC_Closs_Time_Min	The time to turn off all relays——minutes

The following settings are set to open at 8:06 am and close at 4:30 pm every day

Extend CAN Port with Pico Port

Use Pico-CAN-B extend CAN communication port

Preparation

Install mcp_can library

Tutorial

Connect the Pico-CAN-B device to ESP32-S3-Relay-6CH
Power on after connecting Pico-CAN-B to USB-CAN-A

Download the provided Pico-CAN-B Demo
Modify the demo according to the required operation

In the main program, reference WS_MCP2515.c and WS_MCP2515.h
After referencing, you can receive CAN data and send CAN data in the main program via the functions receiveCANData(uint32_t* canId, uint8_t* data) and sendCANData(uint32_t canId, uint8_t len, uint8_t* data)

Data reception: Use USB-CAN-A_TOOL for debugging

Data transmission: Use the serial debugging assistant to view the printed data (you can also use the Arduino serial monitor to view it)

Expand Environmental Monitoring Function

Use Pico-Environment-Sensor to extend environmental monitoring function

Preparation

Install Adafruit BME280 library

Select INSTALL ALL

Install Adafruit TSL2591 library

Select INSTALL ALL

Install Adafruit LTR390 library

Select INSTALL ALL

Install Adafruit SGP40 library

Select INSTALL ALL

Tutorial

Connect the Pico-Environment-Sensor device to ESP32-S3-Relay-6CH
Download the provided Pico-Environment-Sensor Demo
In the main program, reference Environment_Sensor.c and Environment_Sensor.h
Modify the program according to your needs, by default the demo runs and the results can also be viewed in the Arduino serial monitor

Extend RSRS232/RS485 Port with Pico Port

Please note, when using Pico-2CH-RS485 to expand the RS485 port, only channel 1 is supported, and channel 0 cannot be used
Use Pico-2CH-RS232 extend RS232 communication port

Tutorial

Connect Pico-2CH-RS232 or Pico-2CH-RS485 device to ESP32-S3-Relay-6CH
Connect Pico-2CH-RS485 device to USB TO RS232/485 Converter, in the same way as Pico-2CH-RS232

Download the provided Pico-2CH-RS232 Demo (The demo applies to the above two devices)
Reference WS_UART.h in the main program
Modify the demo according to the required operation

Currently printing received characters in real time
Call the initialization function Extension_Init() in setup
After calling, data can be sent in the main loop program through the functions SetData2(uint8_t* data, size_t length) and SetData3(uint8_t* data, size_t length)

Default program communication process: USB to RS485 converter communicates with ESP32-S3-Relay-6CH through Pico-2CH-RS485

Working with MicroPython

This section focuses on setting up the MicroPython development environment, primarily covering firmware flashing, installation, and the use of Thonny. For the installation part of Thonny, detailed explanations of the installation steps and usage instructions are provided, offering comprehensive and clear guidance for developers to build a MicroPython development environment.

Environment Setup

Download and Install Thonny

Open the download page of Thonny official website and select the corresponding system and system bit to download
Select the appropriate system and version, for example, with a 64-bit Windows, the mouse needs to be moved to the Windows section to display the corresponding information, then click to Download and Install
The rest can be installed by default

Flash the Firmware

Currently, the development board is developed using customized firmware, which is available in ESP32-S3-Relay-6CH Demo, note that the download address is the 0x00 location

bin file path:

..\ESP32-S3-Relay-6CH-Demo\MicroPython\Firmware

For a tutorial on flashing firmware, please refer to Flash Firmware Flashing and Erasing tutorial

The bin file is a file for testing the onboard function under the Firmware folder that is at the same level as the Arduino and MicroPython folders, and there is no need to flash it here

MicroPython firmware compilation for more learning resources for MicroPython firmware compilation

Thonny Usage

If you are just getting started with ESP32 and Thonny, and you don't know how to use Thonny, please expand and take a look. Hope it can help you!

Select the development board and model

Download and install the latest Thonny IDE, then open Thonny IDE -> Configure interpreter..., as shown in the following image
Select ESP32 and the corresponding COM port
Click this button to see the output statement in the shell, which indicates that the development board firmware has been successfully utilized

Upload demo

The following is an example of using ESP32-S3-Touch-1.28, if you install other demos, the operation steps are similar.

How to find the desired demo, if there is no Files column at the beginning, we can find it in the View
Upload the local file to the development board, select the file, right-click with the mouse, find "Upload to/", and then download
The following is the interface where all downloads are completed, the downloaded file must be consistent with the file in the red box, otherwise it may fail to run
Select the file with the .py suffix, and click the green button to flash and run
When running another file, first click the red stop button, so that the other file can run normally

Demo

ESP32-S3-Relay-6CH Demos
Demo	Basic Description
main.py	Main function
ws_bluetooth.py	Bluetooth initialization and command parsing
ws_gpio.py	RGB, buzzer, relay initialization
ws_information.py	Global system parameter settings
ws_relay.py	Implement relay control
ws_serial.py	8-ch relay extension

Upload Demo

Upload the local file to the development board, select the file, right-click with the mouse, find "Upload to/", and then upload

The following is the interface where all uploads are completed, the uploaded file must be consistent with the file in the image, otherwise it may fail to run

Run Demo

After running the demo

RS485 control

Jump to RS485 Control Tutorial

Bluetooth Control

Jump to Bluetooth Control Tutorial

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-Relay-6CH\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

Schematic Diagram

ESP32-S3-Relay-6CH Schematic diagram

Demo

ESP32-S3-Relay-6CH Demo

Datasheets

ESP32-S3

Software Tools

Arduino

VScode

VScode official website

Thonny

Thonny official download link

Debugging tool

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:

Install MAC Driver and flash again.

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 RS485, it is not sensitive or communication fails?

Answer:

Please move the jumper cap to 120R and try again. Some RS485 devices require a 120R resistor to be connected in series.

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ESP32-S3-Relay-6CH

Overview

Introduction

Features

Specifications

Onboard Resources

Interfaces

Dimensions

Electrical Safety Precautions

Usage Instructions

Development Tools

Arduino IDE

MicroPython

Components Preparation

Working with Arduino

Environment Setup

Download and Install Arduino IDE

Install ESP32 Development Board

Install library

Run the First Arduino Demo

New Project

Compile and Flash Demos

Demo

Arduino Project Parameter Setting

01_MAIN_WIFI_AP

02_MAIN_WIFI_STA

03_MAIN_WIFI_MQTT

04_MAIN_ALL

External Expansion

RS485 Extended Relay Channels

Extend Timer Switch Function with Pico Port

Extend CAN Port with Pico Port

Preparation

Tutorial

Expand Environmental Monitoring Function

Preparation

Tutorial

Extend RSRS232/RS485 Port with Pico Port

Tutorial

Working with MicroPython

Environment Setup

Download and Install Thonny

Flash the Firmware

Thonny Usage

Select the development board and model

Upload demo

Demo

Upload Demo

Run Demo

Flash Firmware Flashing and Erasing

Working with Homeassistant

Resources

Schematic Diagram

Demo

Datasheets

ESP32-S3

Software Tools

Arduino

VScode

Thonny

Debugging tool

Other Resource Links

FAQ

Support