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 * MODULE4RELAY * Firmware * MODULE4RELAY STM32 Firmware Pinout M5Core GPIO22 GPIO21 5V GND 4Relay Module SCL SDA 5V GND https://elecena.pl/product/22727121/m5stack-4-channel-relay-module-stm32 2023-03-07 https://elecena.pl/product/22727121/m5stack-4-channel-relay-module-stm32 2023-12-27 https://elecena.pl/product/22727121/m5stack-4-channel-relay-module-stm32 2024-09-18 https://elecena.pl/product/22727121/m5stack-4-channel-relay-module-stm32 2024-11-29 https://elecena.pl/product/22727121/m5stack-4-channel-relay-module-stm32 2024-11-30 https://elecena.pl/product/22727121/m5stack-4-channel-relay-module-stm32 2025-08-06 https://elecena.pl/product/22727121/m5stack-4-channel-relay-module-stm32 2025-11-28 https://elecena.pl/product/22727121/m5stack-4-channel-relay-module-stm32 2025-11-29