Industrial 1-channel WiFi Bluetooth ESP32-S3 RS485 relay module Waveshare
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Industrial 1-channel WiFi relay module with ESP32-S3
Based on the powerful ESP32-S3 microcontroller, this industrial module features a single relay, supporting Wi-Fi, Bluetooth 5 (LE) wireless communication, and an isolated RS485 interface. It is equipped with a range of protection circuits, such as power and optocoupler isolation, and is enclosed in a DIN rail-mountable housing. It ensures safe and reliable control in industrial applications and automation systems.
Key features:
- Microcontroller ESP32-S3 (dual-core Xtensa 32-bit LX7, 240 MHz).
- Integrated wireless communication Wi-Fi 2.4GHz and Bluetooth 5 (LE).
- High-quality relay with contact rating ≤10A 250VAC / 30VDC.
- Built-in, isolated interface RS485 for communication with sensors and industrial devices (e.g., Modbus).
- Integrated RTC supporting time-scheduled tasks.
- Port USB Type-C designed for power supply, programming, and debugging.
- Advanced protection circuits: power isolation, optocoupler (against high voltage), and digital (against signal interference).
- LED indicators for power status, relay operation, and RS485 data transmission (TX/RX).
- Practical housing with a DIN rail mount, ensuring easy and secure installation in control cabinets.
Safety and advanced isolation
The module features integrated circuits to prevent interference and damage from surges. This includes hardware power isolation, digital signal path isolation, and optocoupler relay protection, resulting in stable and safe operation even in demanding industrial environments.
Connection diagram and pinout description
Top header and connectors:
- Power supply (Screw terminal): DC 5V input (Positive / Negative).
- USB Type-C: Power supply, programming, and USB communication.
- SH1.0 connector: System pins - GND, 3.3V output, GPIO2, GPIO1.
Bottom terminal block:
- RS485 interface: A+ and B- signal lines.
- Relay: COM (common) and NO (Normally Open).
Mainboard construction
- ESP32-S3: up to 240MHz, with Wi-Fi 2.4GHz and BLE.
- DC-DC converter: supports output up to 3.3V 2A.
- Goldpin headers (pitch 2.0mm): for connecting external modules.
- Power screw terminal: 5V DC input.
- USB-C port: power and communication.
- RTC battery connector (SH1.0): time backup for the PCF85063 chip.
- Ceramic antenna: on-board.
- IPEX 1 connector: optional external antenna connection.
- LED indicators: PWR, RELAY, RS485 (TX green, RX blue).
- Hardware isolation: optocouplers, digital signal isolation, and built-in isolated power supply.
- Buttons: BOOT and RESET for the microcontroller.
- TVS diodes: hardware surge suppression.
- High-quality relay: 10A 250VAC / 30VDC.
- RS485 matching resistor: built-in 120R activated by jumper.
Technical specification
- Microcontroller: ESP32-S3 (default ESP32-S3R8 chip)
- Connectivity: Wi-Fi 2.4GHz (802.11 b/g/n), Bluetooth 5 (LE)
- Power supply: 5V DC (via USB-C or screw terminal)
- Relay type: 1 channel, 1 NO (Normally Open) contact
- Relay rating: ≤10A 250VAC / 30VDC
- Relay isolation: Optocoupler
- RS485 interface: Galvanically isolated (screw terminal)
- RS485 protection: TVS diodes, surge and ESD protection
- RS485 direction: Automatic hardware control
- Status indicators (LED): Power, Relay, RS485 (TX/RX)
- Housing: Protective, with DIN rail mount
- Overall dimensions: 91,6 × 23,3 × 58,7 mm
DIN rail housing and dimensions
Kit contents
- ESP32-S3-Relay-1CH module – 1 pcs.
- 4-pin SH1.0 cable (approx. 150 mm) – 1 pcs.
- Flathead screwdriver – 1 pcs.
Safety
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