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M5Stack M121 4-Channel Relay Modules

M5Stack M121 4-Channel Relay Modules with 4-channel mechanical relays (NO, COM) support active and passive modes of operation. These modules feature an STM32F030F4 main control chip, a 5VDC to 24VDC power input interface, and an I2C communication interface. The 4-channel relay modules support I2C protocol, 24W maximum load (DC 24V@1A), and DC control. Typical applications include on/off control, solenoid valve control, and DC control load on/off.

Features

  • M121:
    • Embedded with STM32F030F4
    • 5VDC to 24VDC input, M5 BUS HPWR bus
    • Development platform:
      • Arduino
      • UIFlow (coming soon)
  • M121-V11:
    • Embedded with STM32G030F6® 32-bit Cortex®-M0+ CPU
    • 5VDC to 24VDC input
    • Development platform:
      • Arduino
      • UIFlow
  • I2C communication (0x26 address)
  • Relay:
    • 4x relay module (COM, NO interface)
    • 24W maximum load (DC 24V@1A)
  • Supports two operation modes (selected by jumper):
    • Active mode
    • Passive mode

Applications

  • On/off control
  • Solenoid valve control
  • DC control load on/off

Kit Contents

  • 1x 4-relay module
  • 5x wiring terminal 2.54mm-2P (green)
  • 10x PIN jumper
  • 1x wiring instructions

4-Channel Relay Module Overview

M5Stack M121 4-Channel Relay Modules

Schematic Diagrams

Published: 2022-08-30 | Updated: 2023-12-21