The M5Stack 4-Relay Module is a 4-Channel Relay module compatible with the M5Stack Core and Core2 series, with 4-channel mechanical relays (NO, COM).

The module supports the I2C protocol and can be set by a jumper into active/passive modes. This relay module supports DC control only, and the Maximum load is 24W (DC 24V@1A). It is suitable for small load circuit control.

Product Features

• Embedded with STM32F030F4:
  • I2C communication (Addr: 0x26)
• Relay:
  • 4x relay module (COM, NO interface)
  • Maximum load 24W (DC 24V @ 1A)
• Supports two operation modes (selected by jumper).
  • Active mode.
    • Power input connects with relay NO port, to supply load directly.
  • Passive mode.
    • Power input does not connect to the relay port. The user's circuit needs an individual power supply.
• Power input (Support DC input only).
• DC 5-24V INPUT -> M5 BUS HPWR Bus (Controlled by jumper. When stacking with several different M5 modules, HPWR Bus can supply power to other modules that need 24V power, such as SERVO2 module, etc.)
• Development platform: Arduino, UIFlow(coming soon)

Package Contents

• 1x 4-Relay Module
• 5x Wiring Terminal 2.54mm-2P (green)
• 10x Pin Jumpers
  1x Wiring Instructions

Specification

Specifications	Parameters
Main Control Chip	STM32F030F4
Communication interface	I2C communication interface (addr: 0x26)
Support operating mode	Active control / Passive control
Relay channels	4x(COM, NO interface)
Power input interface	DC 5-24V
Load capacity	4 channels max. 24W (DC 24V@1A)
Relay terminal specifications	2.54-2P
Net Weight	37.2g
Gross Weight	37.6g
Product size	54.2*54.2*13.2mm
Package size	95*65*25mm

Resources

• Product Wiki
• Schematic
• 4 Relay Control
  • 4Relay Module with M5Core
  • 4Relay Module with M5Core2
• Library
  • MODULE_4RELAY
• Firmware
  • MODULE_4RELAY STM32 Firmware

Pinout

M5Core	GPIO22	GPIO21	5V	GND
4Relay Module	SCL	SDA	5V	GND