RS-485+CAN bus+DCDC Converter Shield for WeMos Mini

RS-485 + CAN bus + DCDC Converter Shield for WeMos Mini is a small three-in-one board to fit on top of WeMos Mini (ESP32) microcontroller boards:

  • RS485 to TTL Serial transceiver with automatic flow control connects UART compatible GPIO pins on the microcontroller.
  • CAN bus Transceiver is suitable for 12 V and 24 V systems and it connects to ESP32 integrated CAN controller via GPIO pins.
  • DC/DC Converter allows powering the board and the microcontroller with 3.3 V from ~12 V DC source.

This board offers an easy and compact way to connect NMEA-2000 bus and/or one NMEA-0183 (RS-485/RS-422) device to WiFi network on a small boat using NMEA2000-Gateway with ESP32 software getting power from the NMEA-2000 bus or separate ~12 V DC source like 12 V battery.

Features

  • 3.5mm screw terminals
  • Supply voltage: 12 VDC (3.8V-32V)
  • GPIO voltage: 3.3 V
  • DC/DC converter: AP63203
  • RS-485 transceiver with auto direction control: THVD1406
  • RS-485 interface connects to secondary UART on the WeMos Mini ESP32 boards
  • CAN bus transceiver: SN65HVD232
  • Optical isolation: none
  • GPIO pins for WeMos D1 Mini ESP32:
    •  RS-485
      • RX: GPIO16
      • TX: GPIO17
    • CAN bus
      • RX: GPIO19
      • TX: GPIO18

Resources

Buy

  • Bare PCB: 3€
  • Pre-assembled: 21€
  • Pre-assembled with terminals: 26€

RS-485 Shield for WeMos D1 Mini

RS-485 Shield for WeMos D1 is a half-duplex RS-485 to TTL Serial transceiver board for WeMos D1 Mini (ESP8266) and WeMos C3 Mini (ESP32) microcontrollers. This board was designed mainly for easy Wifi to Modbus connectivity using HomeAssistant‘s ESPHome Modbus Component.

Features

  • RS-485 chip: MaxLinear SP3485 or any other pin compatible RS-485 to TTL serial transceiver
  • RS-485 connector: RJ45 socket (TE / MOLEX) or 3.5mm 3-pin screw terminal
  • Supply voltage: 3.3V (from WeMos Mini microcontroller board)
  • Logic level: 3.3V
  • Serial interface connects directly to UART interface on the microcontroller (Serial debug should be disabled)
  • Esphome pins on WeMos D1 Mini (ESP8266) boards:
    • TX: 1
    • RX: 3
    • Flow control: 2
  • Esphome pins on WeMos C3 Mini (ESP32) boards:
    • TX: 21
    • RX: 20
    • Flow control: 6

Resources

Buy

  • Bare PCB: 3€
  • Pre-assembled: 12€
  • Pre-assembled with screw terminals: 17€
  • Pre-assembled with RJ45 socket: 17€