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 5V_DC to 24V_DC 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
- 5V_DC to 24V_DC input, M5 BUS HPWR bus
- Development platform:
  - Arduino
  - UIFlow (coming soon)
M121-V11:
- Embedded with STM32G030F6^® 32-bit Cortex^®-M0+ CPU
- 5V_DC to 24V_DC 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

M5Stack M121 4-Channel Relay Modules

Features

Applications

Kit Contents

4-Channel Relay Module Overview

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