ArduinoLab allows you to control the digital inputs and outputs of Arduino 1 Rev.3 through the USB port. It Allows Arduino to control 6 users through relay and acquire the status of 6 analog and 6 digital inputs. The digital inputs and relay outputs are equipped with an LED that signals its status. The board is powered directly from the Arduino module, which provides 5 volts derived from its regulator between 5V and GND contacts. The mini-relay Shield operate at 12 volts, so that the relays are working properly you have to power the Arduino module with an external power supply can provide this voltage. The card can be used in many applications and in many ways.