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Arduino Relay Shields - Arduino A000110, The Arduino 4 Relays shield is designed as a solution for driving those high power loads that cannot be driven by Arduino's digital IOs due to current and voltage limits. The shield features 4x relays, with each relay providing 2 pole changeover contacts (NO and NC). The 2 changeover contacts have been put in parallel in order to increase output current limits. The relays are controlled by the following Arduino board pins: Relay 1 = Arduino pin 4 Relay 2 = Arduino pin 7 Relay 3 = Arduino pin 8 Relay 4 = Arduino pin12 The Eagle files can be downloaded here. The schematic can be downloaded here. Arduino 4 Relay Shield A000110