Grove - 2-Channel SPDT Relay
Two-channel Grove relay module with SPDT contacts, controlled by a 5 V GPIO signal. Switches up to 250 V AC or 110 V DC per channel; connects via standard 4-pin Grove cable.
Pinout
- VCC
Grove control-side supply for the relay module; Seeed lists operating voltage as 5V
Type · PowerVoltage · 5V - GND
Grove control-side ground/common reference
Type · GroundVoltage · 0V - SIG1
Digital input controlling relay K1; Seeed states SIG1 high turns Q1 on, energising K1 so COM1 connects to NO1
Type · GPIOVoltage · 5V logic per Seeed relay schematic explanation - SIG2
Digital input controlling the second relay channel; Seeed lists the module input interface as Digital SIG1/SIG2
Type · GPIOVoltage · 5V logic per module operating voltage - COM1
Common terminal for relay channel 1; default connects to NC1, energised relay connects COM1 to NO1
Type · UnknownVoltage · load side, Seeed rating up to 10A 250VAC / 10A 30VDC - NC1
Normally-closed terminal for relay channel 1; connected to COM1 when K1 is not energised
Type · UnknownVoltage · load side, Seeed rating up to 10A 250VAC / 10A 30VDC - NO1
Normally-open terminal for relay channel 1; connected to COM1 when K1 is energised
Type · UnknownVoltage · load side, Seeed rating up to 10A 250VAC / 10A 30VDC - COM2
Common terminal for relay channel 2, matching the second SPDT relay output channel
Type · UnknownVoltage · load side, Seeed rating up to 10A 250VAC / 10A 30VDC - NC2
Normally-closed terminal for relay channel 2, matching the second SPDT relay output channel
Type · UnknownVoltage · load side, Seeed rating up to 10A 250VAC / 10A 30VDC - NO2
Normally-open terminal for relay channel 2, matching the second SPDT relay output channel
Type · UnknownVoltage · load side, Seeed rating up to 10A 250VAC / 10A 30VDC
| Pin | Type | Function | Voltage |
|---|---|---|---|
| VCC | Power | Grove control-side supply for the relay module; Seeed lists operating voltage as 5V | 5V |
| GND | Ground | Grove control-side ground/common reference | 0V |
| SIG1 | GPIO | Digital input controlling relay K1; Seeed states SIG1 high turns Q1 on, energising K1 so COM1 connects to NO1 | 5V logic per Seeed relay schematic explanation |
| SIG2 | GPIO | Digital input controlling the second relay channel; Seeed lists the module input interface as Digital SIG1/SIG2 | 5V logic per module operating voltage |
| COM1 | Unknown | Common terminal for relay channel 1; default connects to NC1, energised relay connects COM1 to NO1 | load side, Seeed rating up to 10A 250VAC / 10A 30VDC |
| NC1 | Unknown | Normally-closed terminal for relay channel 1; connected to COM1 when K1 is not energised | load side, Seeed rating up to 10A 250VAC / 10A 30VDC |
| NO1 | Unknown | Normally-open terminal for relay channel 1; connected to COM1 when K1 is energised | load side, Seeed rating up to 10A 250VAC / 10A 30VDC |
| COM2 | Unknown | Common terminal for relay channel 2, matching the second SPDT relay output channel | load side, Seeed rating up to 10A 250VAC / 10A 30VDC |
| NC2 | Unknown | Normally-closed terminal for relay channel 2, matching the second SPDT relay output channel | load side, Seeed rating up to 10A 250VAC / 10A 30VDC |
| NO2 | Unknown | Normally-open terminal for relay channel 2, matching the second SPDT relay output channel | load side, Seeed rating up to 10A 250VAC / 10A 30VDC |
Pin details
10 connections- VCC
Grove control-side supply for the relay module; Seeed lists operating voltage as 5V
PowerVoltage · 5V - GND
Grove control-side ground/common reference
GroundVoltage · 0V - SIG1
Digital input controlling relay K1; Seeed states SIG1 high turns Q1 on, energising K1 so COM1 connects to NO1
GPIOVoltage · 5V logic per Seeed relay schematic explanation - SIG2
Digital input controlling the second relay channel; Seeed lists the module input interface as Digital SIG1/SIG2
GPIOVoltage · 5V logic per module operating voltage - COM1
Common terminal for relay channel 1; default connects to NC1, energised relay connects COM1 to NO1
UnknownVoltage · load side, Seeed rating up to 10A 250VAC / 10A 30VDC - NC1
Normally-closed terminal for relay channel 1; connected to COM1 when K1 is not energised
UnknownVoltage · load side, Seeed rating up to 10A 250VAC / 10A 30VDC - NO1
Normally-open terminal for relay channel 1; connected to COM1 when K1 is energised
UnknownVoltage · load side, Seeed rating up to 10A 250VAC / 10A 30VDC - COM2
Common terminal for relay channel 2, matching the second SPDT relay output channel
UnknownVoltage · load side, Seeed rating up to 10A 250VAC / 10A 30VDC - NC2
Normally-closed terminal for relay channel 2, matching the second SPDT relay output channel
UnknownVoltage · load side, Seeed rating up to 10A 250VAC / 10A 30VDC - NO2
Normally-open terminal for relay channel 2, matching the second SPDT relay output channel
UnknownVoltage · load side, Seeed rating up to 10A 250VAC / 10A 30VDC
Relays
46 other optionsGravity and Grove single-relay modules, Pi relay HATs, USB-RLY16 boards, Sonoff Wi-Fi smart switches, and Waveshare Modbus RTU/TCP industrial modules — matched by control interface and contact rating.
16-Ch Ethernet Relay Module, Modbus RTU / Modbus TCP Protocol, Ethernet Port Communication, Supports PoE Power Supply, With Various Isolation And Protection Circuits visual preview16-Ch Ethernet Relay Module, Modbus RTU / Modbus TCP Protocol, Ethernet Port Communication, Supports PoE Power Supply, With Various Isolation And Protection Circuits
2-Channel SPST Relay Unit visual preview2-Channel SPST Relay Unit
315MHz Codec-Adaptive Wireless Relay visual preview315MHz Codec-Adaptive Wireless Relay
315MHz Remote Relay Switch Kit - 2 Channels visual preview315MHz Remote Relay Switch Kit - 2 Channels
315MHz Wireless Car Key Fob with Key Chain (battery included) visual preview315MHz Wireless Car Key Fob with Key Chain (battery included)
4-Ch Modbus RTU Relay Module, RS485, 30A visual preview4-Ch Modbus RTU Relay Module, RS485, 30A
4-Relay Unit visual preview4-Relay Unit
433MHz Codec-Adaptive Wireless Relay visual preview433MHz Codec-Adaptive Wireless Relay
8 Channel Relay Module (RJ45-RLY16, Up to 16A) visual preview8 Channel Relay Module (RJ45-RLY16, Up to 16A)
8-Ch Dual-Ethernet Relay Module (C), Modbus RTU, PoE visual preview8-Ch Dual-Ethernet Relay Module (C), Modbus RTU, PoE
8-Ch Ethernet Relay Module (B) with Digital Input, Modbus RTU/TCP, PoE visual preview8-Ch Ethernet Relay Module (B) with Digital Input, Modbus RTU/TCP, PoE
8-ch Ethernet Relay Module, Modbus RTU/Modbus TCP Protocol, PoE port Communication, With Various Isolation And Protection Circuits visual preview8-ch Ethernet Relay Module, Modbus RTU/Modbus TCP Protocol, PoE port Communication, With Various Isolation And Protection Circuits
Related groups
4 groups
10W Super Bright LED - Violet visual previewLED pixels
WS2812/SK6812 NeoPixel strips, rings and Jewels, APA102 DotStar pixels, and plain analog RGB strips — each matched to its protocol and host, not just its connector.
Components · Addressable LEDs · 180 parts
18-Channel 8-bit PWM LED Driver w/ I2C Interface visual previewBare ICs
74HC logic gates, MCP3008/MCP23017 ADCs and expanders, 24LC256 EEPROM, 4N25-series optocouplers and ULN2803A drivers — bare DIP chips with no breakout-board conveniences like pull-ups or level shifting.
Components · Integrated circuits · 68 parts
10-bit ADC (SPI) visual previewConverters
ADS1115/MCP3421 ADCs, MCP4725 and GP8413 DACs, CP2102 USB-UART boards, and I2C plumbing like the LTC4316 address shifter — matched to bus, resolution and signal range.
Components · Interface converters · 114 parts
256MB Micro SD Memory Card visual previewMemory
24LC32/25LC256 EEPROM, I2C FRAM, 64Mbit PSRAM, and microSD breakouts up to 64GB — matched to write frequency and data volume, not just interface.
Components · Memory & storage · 39 parts