Waveshare ESP32S3 WiFi/BLE Relay 6CH | RS485 | DINRail, Isolated

Waveshare ESP32S3 Relay 6CH is an industrialgrade relay control board designed for IoT, automation, and smart home applications. Powered by the ESP32S3 dualcore processor, it supports WiFi, Bluetooth LE, and an onboard isolated RS485 interface for reliable communication with Modbus devices. The board integrates six highquality relays (10A 250VAC / 30VDC) with optocoupler and digital isolation, ensuring safe and stable operation even in demanding environments. A 40pin Pico HAT compatible header allows expansion with modules such as RTC, CAN, RS232, or LoRa, while the railmounted ABS case provides secure installation. With wide voltage input (736V), USB TypeC for programming, and builtin indicators, this module offers a flexible and dependable solution for industrial and AIoT projects.

Key Features

• HighPerformance MCU ESP32S3, Xtensa 32bit LX7 dualcore @ 240MHz with AI computing capabilities and encryption.

• Wireless & Wired Connectivity Integrated 2.4GHz WiFi + Bluetooth5 LE; onboard isolated RS485 port.

• 6 Quality Relays Contact rating 10A250VAC / 30VDC; direct control of highvoltage appliances or DC loads.

• IndustrialGrade Isolation Power isolation, optocoupler isolation, and digital signal isolation for enhanced safety.

• Pico HAT Expansion 40pin header compatible with Raspberry Pi Pico HATs (add RTC, CAN, RS232, LoRa, sensors, etc.).

• Robust Protection TVS diodes, surge suppression, ESD protection, and onboard matching resistor (enable via jumper).

• User Indicators RGB LED, power indicator, RS485 TX/RX LEDs, and onboard buzzer for status feedback.

• Flexible Power Input USBC or 736V DC via screw terminal; onboard isolated power output for RS485 devices.

• Compact DINRail Enclosure ABS case for safe, easy installation.

Specifications

Part List

• ESP32-S3-Relay-6CH x1
• 2.4G 4DB SMA antenna x1
• Screwdriver x1

Onboard multiple isolation protection circuit

Multiple protections, more safe and reliable

High quality 6-Ch relays, supports RS485 and Bluetooth / WIFi remote control

Contact rating of the onboard relay up to 10A 250VAC/30VDC
Directly controlling 220VAC home appliances, or devices below 30VDC

Onboard Pico HAT compatible interface and RS485 interface for easy expansion

Onboard isolated RS485 interface, for connecting to various RS485 Modbus industrial modules or sensors. Onboard 40PIN header compatible with some Raspberry Pi Pico HAT, for expanding more functions such as RTC / CAN / RS232 / LoRa / sensor, etc.

Supports Arduino, Micropython development

Comprehensive SDK, Dev Resources, And Tutorials To Help You Easily Get Started

Applications

• Industrial equipment control and monitoring

• Home and building automation

• Remote IoT relay switching via WiFi / Bluetooth / RS485

• Sensortriggered relay control with full electrical isolation

• Integration with Arduino, MicroPython, ESPHome, Home Assistant, and custom firmware

Support Batch Customization

Support software and hardware customization
Including hardware interface, LOGO, label, case and web page, etc.

What’s On Board

1. ESP32-S3
   up to 240MHz operating frequency, with 2.4GHz WiFi and BLE
2. 6-channel quality relays
   contact rating per channel: 10A 250V AC or 10A 30V DC
3. Optocoupler isolation
   prevents interference from external high-voltage circuit connected to the relay
4. Digital isolation
   prevents interference from external signal
5. Power supply isolation
   provides stable isolated voltage, needs no extra power supply for the isolated terminal
6. TVS diode
   effectively suppresses surge voltage and transient spike voltage in the circuit
7. Ceramic gas discharge tube
8. Relay screw terminals
   for connecting with user devices
9. 40PIN Raspberry Pi Pico HAT header
10. RS485 bus interface
    for connecting to external RS485 devices

1. Power supply screw terminal
   Supports DC 7~36V wide voltage input
2. LED indicators
   PWR: power indicator
   RXD: RS485 RX indicator
   TXD: RS485 TX indicator
3. WS2812 RGB LED
   controllable via GPIO38
4. USB Type-C connector
   for module power supply, firmware downloading and USB communication
5. Passive buzzer
   sound frequency is controllable via GPIO21
6. ESP32 RESET button
7. ESP32 BOOT button
8. External antenna connector
   SMA female connector, for WiFi and Bluetooth wireless communication
9. RS485 matching resistor jumper
   Onboard reserved 120R matching resistor, enabled via jumper
10. Relays default control pin setting

Enclosure Design

ABS Protection Enclosure With Rail-Mount Support, Easy To Install, Safe To Use

Size