아두이노 4 릴레이 쉴드를 사용하면, 아두이노 디지털 핀의 전압, 전류의 한계로로 인해 제어할 수 없었던 높은 전력을 필요로 하는 장치를 구동할 수 있습니다. 이 쉴드에는 4개의 릴레이가 있습니다. 각 릴레이는 2개의 변환접점(2 pole changeover contacts, NO와 NC)을 가지고 있습니다. 각 출력의 한계 전류(current limit )를 증가시키기 위해서는 2개의 변환 접점이 병렬로 놓여야 합니다.
4개의 LED가 각 릴레이의 on/off 상태를 표시합니다.


Summary

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
 

Schematic & Reference Design

EAGLE files: arduino-4-Relays-Shield-reference-design.zip
Schematic: arduino-4-Relays-Shield-schematic.pdf


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. 

Compatibility

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