The Arduino 4 Relays Shield is a solution for driving high-power loads that cannot be controlled by an Arduino's digital I/Os due to the current and voltage limitations of the controller.
The Shield features four relays. Each relay provides two pole changeover contacts (Normally Open and Normally Closed). In order to increase the current limit of each output, the two changeover contacts have been put in parallel. Four LEDs indicate the on/off state of each relay.
Arduino 4 Relays Shield Features
- Operating Voltage: 5V
- Coil Current Consumption: 140mA with all relays on — about 35mA each
- Single Pole Chargeover Contact Maximum Current: 2A at 30V DC
- Maximum Load Voltage: 48V
- Maximum Switching Capacity: 60W
Powering the Shield The shield doesn't need external power; it will be provided through the 5V and 3.3V pins of your Arduino host board.
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 also features input/output and communication interfaces for adding any TinkerKit modules you may have. This can simplify the creation of a project or a prototype. The on-board TinkerKit connectors are:
- 2 TinkerKit Inputs: IN2 and IN3 (in white), routed to Arduino A2 and A3 analog input pins.
- 2 TinkerKit Outputs: OUT5 and OUT6 (in orange), routed to Arduino PWM outputs on pins 5 and 6.
- 2 TinkerKit TWI (in blue), routed to the Arduino TWI interface. Both connect to the same TWI interface to allow you to create a chain of devices.
Arduino 4 Relays Board Resources