SPDT Mechanical DC Relay (H0FR1x)


SKU: H0FR10 Category:

SPDT Mechanical DC Relay

Stage: Beta

Available on backorder


H0FR1x is a compact mechanical DC relay module capable of driving DC loads up to 30V / 8A. It is based on Omron G5LE-14-DC3 SPDT relay and STM32F0 MCU.

  • The relay is SPDT (single-pole-double-terminal) type with NC and NO terminals.
  • Use as a stand-alone smart DC relay and easily control DC loads (heaters, solenoids, DC motors, etc.) via a Command Line Interface (CLI).
  • Firmware has embedded on / off / toggle and timers functionality.
  • Program advanced C code with our easy-to-use APIs.
  • Connect multiple H0FR1 modules together and combine with H0FR6 to drive AC loads as well.
  • Send commands to a single relay, a group of relays or broadcast to all of them.
  • Connect to external hardware or combine with other Hexabitz modules!



  • Omron G5LE-14-DC3 mechanical SPDT relay:
    • Single-pole, double-terminal (SPDT) with NC and NO terminals.
    • 3VDC / 130mA coil.
    • Contact:
      • 10A at 120VAC.
      • 8A at 30VDC.
      • 10A at 240VAC.
    • Max switching power 1200 VA, 240 W.
  • Orange indication LED for relay state.
  • Relay load connector: TE Connectivity 3-position 5.08mm shrouded terminal block.


  • STM32F091CBU6 32-bit ARM Cortex-M0 MCU.
  • 8MHz external oscillator.
  • Five array ports and six power ports (+3.3V and GND).
  • Access to 5xUART, 2xI2C, SWD, BOOT0, RESET.

Physical Properties

  • Shape: Hexagon
  • Size: 30 mm short diagonal, 17.32 mm side
  • Area: 7.8 cm^2
  • Weight: 6 g
  • Soldermask Color: Dark green
  • Surface Finish: ENIG (gold) or HASL-LF (tin)

Bill of Materials


Quickstart Guide

Download PDF version here.



Frequently Asked Questions

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Have more questions? Please check our main FAQ page and feel free to contact us for any unanswered questions.


  • Schematics (PDF)
  • Hardware Design Files (EAGLE)
  • Source Code (GitHub). Download a pre-compiled firmware HEX file here.
  • Documentation / Factsheet (PDF)
  • Projects & Examples: Please check our account on Hackster.io for demo projects and examples.