ESP32-S3 6-Channel WiFi Relay Module Provides RS485 Interface And Supports Raspberry Pi Pico HAT

The Waveshare ESP32-S3-Relay-6CH is a 6-channel WiFi based on the Espressif Systems ESP32-S3 wireless microcontroller that also supports RS485 control and is equipped with a header that uses the Raspberry Pi Pico HAT that adds an RTC, CAN bus and RS232. and a Bluetooth relay module. LoRa, sensors or other functions.

The relay is rated at 250 VAC/30 VDC (max 10 A) and the system accepts 7 V to 36 V DC input via a terminal block and can be programmed with Arduino or MicroPython via the USB-C port. It also has a built-in buzzer, RGB LED lighting and comes in a DIN-rail-mountable ABS case.

Waveshare ESP32-S3-Relay-6CH Specifications:

  • Wireless Module – Originally ESP32-S3-WROOM-1U-N8 MCU – ESP32-S3 Dual Core Tensilica LX7, up to 240MHz with 512KB SRAM – Quad Flash SPI 8MB Wireless – 2.4GHz WiFi 4 and Bluetooth LE 5 approx. external antenna
  • MCU – ESP32-S3 Dual Core Tensilica LX7, up to 240MHz, 512KB SRAM
  • Storage – 8MB Quad SPI Flash
  • Wireless – 2.4 GHz WiFi 4 and Bluetooth LE 5
  • u.FL connector for external antenna
  • 6x relay cross-referenced terminal block – up to 10A 250V AC/30V DC – 1NO 1NC optocoupler isolation
  • Nominal value – up to 10A 250V AC / 30V DC
  • Contact us – 1NO 1NC
  • Separate optics
  • USB – USB Type C for power, data and programming/flashing
  • Serial – Isolated RS485 communication interface via bare wire terminals TVS diode, on-board surge protection and ESD protection, reserved 120R matching resistor, default NC, enabled via ModBus support
  • TVS diode, surge protection and ESD protection
  • A 120R matching resistor is reserved on the board and by default NC is enabled via a jumper.
  • Modbus support
  • Expansion – The 40-pin header is compatible with select Raspberry Pi Pico caps.
  • RGB, RS485 Tx, RS485 Rx LED buzzer with different LED power
  • RGB LEDs
  • Power, RS485 Tx, RS485 Rx LED
  • whistle
  • Power supply 7 to 36 V DC via 5 V screw terminal via USB-C port
  • 7V to 36V DC via screw terminals
  • 5V via USB-C port
  • Dimensions – 145 x 90 x 30 mm (ABS protective case mounted on the rail)
  • Waveshare provides getting started instructions and code samples using Arduino and MicroPyhon on its wiki, but the latter may be easier to use because it has four samples (instead of one).

  • MAIN_WIFI_AP – RS485 interface control, web interface to WiFi, Bluetooth control (Bluetooth over IP). Access point mode, no need to change the code.
  • MAIN_WIFI_STA – Same as above but in station mode so you need to change the code to use your network’s wifi credentials (easy).
  • MAIN_WIFI_MQTT – Same as above but supports Waveshare Cloud control instead of local web interface (LAN) for remote management.
  • MAIN_ALL – Same as above, but supports both local web (LAN) control and Waveshare Cloud control for remote management.
  • The instructions also use the nRFConnect app to get the IP address and send commands to control the relay via Bluetooth.

    We first spotted the ESP32-S3-Relay-6CH for sale on Aliexpress for $38.69 plus shipping, but you can also find it on Amazon ($37.99) and Waveshare’s online store ($28.99 + shipping).

    Jean-Luc started working part-time at CNX in 2010 before leaving as a software engineering manager, and began writing daily news and reviews full-time in late 2011.

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    About the Author: Yivermectin

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