Gravity 10A Relay Module 3.3-5V Logic Compatible

The Gravity relay module from DFRobot uses a relay to switch loads up to 30 V via a digital output. It works with 2.8 V to 5.5 V and can therefore be operated directly on 3.3 V boards such as Raspberry Pi or ESP32 and on 5 V boards such as Arduino UNO. The relay has a changeover contact with COM, NO and NC, an LED shows the switching state. An acrylic plate covers the underside.

Important: For safety reasons, the module is only intended for voltages up to 30 V and not for mains voltage. DFRobot specifies a maximum of 35 V AC and 30 V DC for the module, the marking 10A 250VAC applies to the relay, not to the module. The module is therefore not suitable for switching the mains supply of devices such as a 3D printer.

Note: The connection cable can be converted to male pins with a Dupont cable M-M, so that it also fits an Arduino UNO.

Recommended Accessories:

• Dupont Cables M-M 10cm 20 Pieces
• Gravity IO Expansion Shield for Arduino V7.1

Features:

• 1 relay with changeover contact (COM, NO, NC), screw terminals
• High level control: the relay switches when the signal is HIGH
• Operation with 2.8 V to 5.5 V, for 3.3 V and 5 V boards
• Coil powered by its own 3 V regulator, the control input D only drives the switching transistor (schematic V1.0)
• LED shows the switching state
• Acrylic plate to protect the underside
• Gravity 3-pin connector: D, +, −

Application Examples:

• Switching 12 V solenoid valves
• Switching LED strips, pumps and fans with extra-low voltage on and off
• Relay on Raspberry Pi and ESP32 without level converter

Connection to 5 V Logic (for example Arduino UNO):

• + to 5V, − to GND
• D to a digital output, for example pin 8, or with the Gravity cable to the IO Expansion Shield
• Output HIGH: relay on, NO connected to COM. Output LOW: relay off, NC connected to COM
• Load to COM and NO or NC, the N/A terminal stays free

Connection to 3.3 V Logic (for example ESP32, Raspberry Pi):

• + to 3.3 V or 5 V, − to GND
• D directly to a GPIO, no level converter is needed: according to schematic V1.0, input D is not connected to VCC
• GPIO HIGH: relay on. GPIO LOW: relay off

Documentation:

• Wiki DFRobot DFR0473
• Schematic (PDF)
• Datasheet (PDF)

Technical Data:

• Manufacturer: DFRobot
• Manufacturer SKU: DFR0473
• Relay: HF3FD/003-ZST, coil 3 V (marking)
• Permitted voltage on this module: up to 30 V
• Module ratings according to DFRobot: 10 A, 35 V AC, 30 V DC, rated load 10 A at 35 V AC and 10 A at 28 V DC, max. 300 W
• Operating voltage: 2.8 V to 5.5 V
• Control signal: HIGH from 2.8 V, LOW up to 0.5 V
• Control: HIGH = relay on
• Operate time: max. 10 ms, release time: max. 5 ms
• Service life: mechanical 1 million, electrical 50,000 switching cycles
• Load connection: screw terminals NC, NO, N/A (free), COM
• Interface: Gravity 3-pin (D, +, −)
• Dimensions: 38 × 33 × 20 mm
• Weight: 20 g

Scope of Delivery:

• 1× Gravity 10A relay module with acrylic plate
• 1× Gravity sensor cable 3-pin digital PH2.0 to XH2.54, 30 cm