M5Stack 4-Channel Relay Unit

The M5Stack 4-Channel Relay Unit uses four relays to switch loads up to 30 V and is controlled via I2C, for example on Port A of an M5Stack Core. An STM32F030 microcontroller on the unit receives the commands at address 0x26. Each relay can be switched individually and has its own status LED, and the load is connected to pluggable terminals with 3.96 mm pitch.

Important: For safety reasons, the unit is only intended for voltages up to 30 V and not for mains voltage. The rating AC 250 V / 10 A given by M5Stack applies to the relays, not to the unit. The unit is therefore not suitable for switching the mains supply of devices such as a 3D printer.

Recommended alternative with one relay: M5Stack 3A Relay Unit

Recommended Accessories:

• M5Stack Basic Core ESP32 IoT Development Kit V2.7
• M5Stack Grove2Dupont Conversion Cable 20cm 10pcs

Features:

• 4 relays, each switchable individually via I2C
• Status LED per channel, either coupled to the relay or switched separately
• Grove connector for Port A (I2C) of an M5Stack Core
• Load connection on 4 pluggable terminals with 3.96 mm pitch
• Mounting holes in the housing

Application Examples:

• Switching 12 V solenoid valves
• Switching LED strips with extra-low voltage on and off
• Controlling fans and pumps with extra-low voltage

Documentation:

• Unit 4Relay product page M5Stack
• Guide Unit 4Relay with Arduino (M5Stack)
• Arduino library M5Unit-RELAY (GitHub)

Technical Data:

• Manufacturer: M5Stack
• Manufacturer SKU: U097
• Microcontroller: STM32F030F4P6
• Permissible voltage on this unit: up to 30 V, with DC up to 28 V
• Relay rating according to M5Stack: AC 250 V / 10 A, DC 28 V / 10 A
• Communication: I2C, address 0x26
• Interface: Grove HY2.0-4P, pinout GND, 5V, SDA, SCL
• Load connection: 4× pluggable terminal HT3.96-4P
• Dimensions: 112 × 23 × 18 mm
• Weight: 40 g, 84 g with packaging

Scope of Delivery:

• 1× M5Stack 4-Channel Relay Unit
• 1× Grove cable 20 cm
• 4× plug-in terminal HT3.96-4P