Arduino 4 Relays Shield

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Arduino 4 Relays Shield

If you are facing the issues with the lack of high-power handling of the digital Input/Output Arduino devices, you need not to worry anymore. Arduino 4 Relays Shield is capable of efficiently handling the high-power loads. With this smart upgrade, you can forget about controlling the voltage-limit. Each of the four relays come NO and NC contacts (2-pole changeover). It helps enhance the current/voltage limits. There is separate LED for each relay to indicate the On/Off state.

Specifications of Arduino 4 Relays Shield

·         4 x 60W relays

·         DIO Arduino Board Interfaces

·         TWI, IN and OUT Thinker Kit interfaces (2 each)

·         Supports an operating voltage of 5V

·         140mA (total current required) i.e. 34mA for each relay

·         L x W = 68.5mm x 53mm

·         Weights just 44-grams

How Arduino 4 Relays Shield Works?

Like all other relays shields, Arduino’s 4 relays also follow the electromagnetism rules. The power converts the relay coil into a magnet and allows it to change the switch position. The power-circuit remains isolated from the relay switches. Due to this isolation, the mechanism allows the system to gain control over the current/voltage. It means that even 230V is running through the power-circuit, the relay coil will remain isolated from the effect.

How to Connect a 4 Relay Board to Arduino?

It is a simple task and doesn’t even require professional expertise. The system is capable of controlling various (AC/DC) devices. The ground pin and the power pin constitute the combination of the first two connection. Simply connect board’s VCC pin to the Arduino +5V. Then connect the relay board (GND pin) to Arduino’s ground. Connect the 4 communication pins i.e. from IN1 to IN4 to Arduino’s data pins.


Arduino doesn’t recommend to connect communication pins to Arduino’s 0 or 1 pins.