ESP32-S3-RS485-CAN
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Introduction
Introduction
ESP32-S3-RS485-CAN is an industrial-grade WiFi wireless communicator based on ESP32-S3 master control that supports WiFi, Bluetooth, RS485, CAN and other peripheral interfaces. 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
- Onboard isolated RS485 interface, for connecting to various RS485 Modbus industrial modules or sensors
- Onboard USB Type-C port for power supply, firmware downloading and debugging, making development more convenient
- Onboard power supply screw terminal, allows 7~36V DC wide range input
- 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 power supply, RS485 TX/RX indicator and CAN indicator for easy monitoring of the operating status of the device
- Rail-mounted ABS protective enclosure, easy to install, safe to use
Specifications
| Model | ESP32-S3-RS485-CAN | |
|---|---|---|
| Microcontroller | ESP32-S3 (default to ESP32-S3R8 chip, customizable) | |
| Wireless communication | 2.4GHz Wi-Fi (802.11 b/g/n), Bluetooth 5 (LE) | |
| USB port | Port type | USB Type-C |
| Supply voltage | 5V | |
| Function | Power supply, USB communication, firmware downloading, etc. | |
| Isolated RS485 communication Interface |
Port type | Screw terminal |
| Direction control | Set automatic control through main control hardware flow | |
| Interface protection | Provide TVS diode protection, surge & ESD protection | |
| Matching resistor | NC by default, reserved 120R matching resistor, enabled via jumper | |
| Isolated CAN communication Interface |
Port type | Screw terminal |
| Direction control | Hardware automatically discriminates and controls the direction of data transmission | |
| Interface protection | Provide TVS diode protection, surge & ESD protection | |
| Matching resistor | NC by default, reserved 120R matching resistor, enabled via jumper | |
| Indicator | PWR | Red power indicator, lights up when connected to USB and voltage is detected |
| RS485 | RS485 indicator: Green indicator lights up when data is transmitted from the RS485 interface Blue indicator illuminates when data is received from the RS485 interface | |
| CAN | CAN indicator , blinks when data communication on the CAN port | |
| Screw terminal power supply | Power supply range | 7V ~ 36V |
| Product appearance | Case | Rail-mounted protective case |
| Size | 91.6 × 23.3 × 58.7 (mm) | |
Onboard Resources
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①. ESP32-S3 ②. DC-DC power module ③. Pin header (2.0mm pitch) ④. Power supply screw terminal ⑤. USB Type-C port ⑥. RTC battery header ⑦. Patch ceramic antenna ⑨. 16MB Flash ⑪. CAN conversion chip |
⑬. BOOT button ⑯. RS485 matching resistor ⑰. CAN matching resistor ⑱. RS485 & CAN communication terminal ⑲. RTC clock chip ⑳. DC-DC power chip ㉒. RS485 conversion chip |
Interfaces
| Upper terminal description | Lower terminal description | |||
|---|---|---|---|---|
| Power supply terminal | Power positive: DC 7V ~ 36V | RS485 terminal | A+ signal pin | |
| Power negative | ||||
| Type-C | For module power supply, firmware downloading and USB communication | B- signal pin | ||
| SH1.0 | GND | Ground (GND) | CAN terminal | H signal pin |
| 3V3 | 3.3V power output | |||
| GPIO2 | ESP32-S3 IO pin | L signal pin | ||
| GPIO1 | ESP32-S3 IO pin | |||
Dimensions
Warning
Usage Guide
ESP32-S3-RS485-CAN currently provides Arduino IDE development tool and framework, and you can choose the right development tool according to your project needs and personal habits.
Development Tool
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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. |
Components Preparation
- ESP32-S3-RS485-CAN x1
- USB cable (Type-A male to Type-C male) x1
- USB TO RS232/485 x 1
- USB-CAN-A x 1
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.x |
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-RS485-CAN library file is stored in the demo, click here to jump: ESP32-S3-RS485-CAN 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" |
Run the First Arduino Demo
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 Description | Dependency Library |
|---|---|---|
| 01_MAIN_WIFI_AP | RS485 interface control, CAN 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, CAN interface control, Bluetooth control, Bluetooth send IP, Web page control (short distance) | Need to modify the WIFI network to connect to 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 RS485 and CAN interfaces through WiFi. 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
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 network to connect to
- 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
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-RS485-CAN\Firmware\Factory bin
Resources
Demo
Schematic
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.
Vincent - Demo ComfoSense Touch
- Youtube : https://www.youtube.com/watch?v=69VF5-dpnYU
- Github : https://github.com/vincentmakes/ComfoSense-Touch
https://github.com/vincentmakes/canbus_hoval
trailcurrentopensource - Waveshare ESP32-S3-RS485-CAN Review
FAQ
- Change the resistor in the below image from vertical soldering (default) to horizontal soldering.
- This product uses ESP32-S3 as the main MCU, so the communication baud rates for both RS485 and CAN can be freely set via software.
- CAN (TWAI) interface: theoretical rate up to 1 Mbps.
- RS485 (UART) interface: theoretical UART rate up to 5 Mbps. However, due to the addition of isolation, level shifting, and protection circuits on the board, the actual usable rate will be slightly lower. It is generally recommended to set it within 115200 bps. The exact value should be verified based on the actual communication environment and application.
- 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.
- 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.
- It's normal for the first compilation to be slow, just be patient
- 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
- 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"
- 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.
- 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.
- The factory demo is for learning only, if it is used for practical application, please optimize the demo logic by yourself.
- Please move the jumper cap to 120R and try again. Some RS485 devices require a 120R resistor to be connected in series
- No, this may risk damaging the module.
Support
Technical Support
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