Arduino 4 Relays Shield

Description: The Arduino 4 Relays Shield allows your Arduino driving high power loads that cannot be controlled directly by Arduino's digital pins. The Shield features four relays, each relay with 2 pole changeover contacts (NO and NC). Four LEDs indicate the on/off state of each relay.

Technical specifics

• Operating Voltage 5V
• Coil current consumption 140 mA (with all releays on, about 35 mA each)
• Single pole chargeover contact maximum current @ 30 V DC 2A
• Maximum load voltage 48 V
• Maximum switching capacity 60 W

Power: The shield doesn't need external power: it will be provided by the base board, through the 5V and 3.3V pins of the Arduino board used as base.

Input and Output. 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 pin 12

The shield features several TinkerKit input/output and communication interfaces. Connecting TinkerKit modules can simplify the creation of a project or a prototype. 

The on-board connectors are :

• 2 TinkerKit Inputs: IN2 and IN3 (in white), these connectors are routed to the Arduino A2 and A3 analog input pins.
• 2 TinkerKit Outputs: OUT5 and OUT6 (in orange), these connectors are routed to the Arduino PWM outputs on pins 5 and 6.
• 2 TinkerKit TWI: these connectors (4-pin in white) are routed on the Arduino TWI interface. Both connect to the same TWI interface to allow you to create a chain of TWI devices.

Physical Characteristics

The maximum length and width of the 4 Relays Shield PCB are 2.7 and 2.1 inches respectively. Four screw holes allow the Shield to be attached to a surface or case. Note that the distance between digital pins 7 and 8 is 160 mil (0.16"), not an even multiple of the 100 mil spacing of the other pins.

Compatible Boards: The shield is compatible with all the Arduino boards, 5V and also 3.3V standards.