Introduction
Introducing the Gravity Digital Relay Module the latest addition to DFRobots Gravity series! This module is a little different to the other relays in our store – not only is it compatible with 5V Arduino boards, but also with Raspberry Pi, BBB (BeagleBoard Black), mbed, Intel Joule, Arduino 101 and other 3.3V devices.
It is specially designed for low-voltage devices and works well under 3.3V power supplies, just like the Raspberry Pi relay board. In addition, the module has a wide range of power inputs. In our tests, once it reaches 2.8~5.5V, it can also support 1.8V devices.
DFRobots Digital Relay Module uses a high quality 3V relay. It can handle up to 10A current and mechanical parts are guaranteed up to 100 million uses. An on-board indicator LED demonstrates the relays state. Terminals include normally open (NO) and normally closed (NC). The module uses a Gravity-3 pin interface, which requires no soldering for convenient plug and play usage.

Features

Supports Arduino, Raspberry Pi, LattePanda etc.

2.8 ~ 5.5V A wide-range of input voltages

The underside of board is isolated using an acrylic plate for safety

Includes an LED Indicator

Uses a gravity-3 Pin interface for easy, plug and play usageSpecification

Operating Voltage: 2.8V ~ 5.5V

Input Signal: High Level (2.8V); Low Level (0.5V)

Max Switching Current: 10A

Max Switching Voltage: 35VAC; 30VDC

Rating Load: 10A@35VAC; 10A@28VDC

Max Switching Power: 300W

Operate Time: 10ms

Release Time: 5ms

Dimensions: 38 x 33 x 20 mm /1.5 x 1.3 x 0.81

Mechanical Life: 1 million uses

Electrical Life: 50 thousand uses

Weight: 20g

Shipping List

Gravity: Digital Relay Module (with Acrylic Base) x 1

Gravity Digital Sensor Cable x 1

Documents

Product Wiki

ProjectsProject 1. Hyduino – Automated Hydroponics with an Arduino
hydroponics is growing plants without the use of a traditional dirt medium by using a nutrient rich water solution. This is especially great for those people that that have limited areas in their backyard to grow in.
Hardware list:

Arduino Mega 2560
Peristaltic Pumps (2)
Regular Pump
pH Electrode Probe and Connection to Arduino

pH Up/Down Solution

5V Relay Modules for Arduino
12V Solenoid Valve
DHT11 or DHT21 or DHT22 Humidity/Temperature Sensor
Photosensitive Sensor for Arduino
Breadboard
Various Wires
Grow Lights (mine are LED)
Sockets for Grow Lights
3.2″ TFT LCD Shield + Touch Screen (usually has an SD card reader on the back of it)
Water Level Sensor Float Switch (2)
I2C RTC DS1307 AT24C32 Real Time Clock Module
9V and 12V Power Supplies
Hydroponics Pots (I’m using 10 – 3″ pots for this)
1″ PVC Pipe and Fittings + Drain Pipe and Fittings