The latest Relay Shield V2.0 use high-quality Relay by NingBo HuiKe .It provides all input and output functions, Integrated dynamic indicator of the module .It can be controlled through Roboboard and controller, converting weak current controll into strong current control.
The Relay Shield utilizes four high quality relays and provides NO/NC interfaces that control the load of high current. Which means it could be a nice solution for controlling devices that couldn’t be directly controlled by Arduino’s Digital I/Os. Standardized shield form factor enables smoothly connection with the Arduino. 4 relays are carried on this module, all of which are optoelectronic isolated. Onboard LEDs show the states of the relay. It can be adopted to control the solenoid valves, lamps, motors and other high current or high voltage devices.