RFID Access Control Shield

This RFID Access Control Shield transforms your Arduino to an access control device. This unit is compatible with RFID modules such as micro RFID, EM-18 and ID-3LA. It includes almost everything that an access control system requires. Onboard Relay driving circuitry helps your Arduino to control magnetic locks, solenoid valve etc. The 5V buzzer provided on board can be used for indicating the RFID card acceptance, say single beep for card acceptance and double beep for rejection.
Relay pins are available on a 3-pin screw terminal (NO,NC,COM) along with a 2-pin screw terminal for powering the 12V relay. Three LEDs are provided on board; STS, RLY and PWR. PWR indicates the power while RLY indicates relay actuation. STS comes in direct connection with an Arduino pin (D12) and it can be controlled in accordance with your Arduino sketch.
The shield is provided with an on board DPDT sliding switch which helps you to connect the RFID module either to your PC (via Arduino USB) or to your Arduino. This feature helps you to configuretest the RFID module before actually using it in your project, this eliminates the need for any separate RFID development board. In addition there are two other onboard switches for ease of access, SW1 to reset your arduino and SW2 in connection with GPIO(D10). This shield comes with a couple of jumper connections for ease of use.