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Product Description

8-Channel Relay Module for Arduino

This board provides 8 optically isolated inputs that accept a wide range of voltage, including the 3VDC and 5VDC signals available on the Arduino. This is a great way to switch on or off AC or DC loads using your Arduino!
The relays are single-pole double-throw (SPDT) and are rated for 10A @ 250VAC. The ground for the relay coils is separate from the ground for the input signals. This, along with the optical isolation, provides a total galvanic isolation between the input and output. The two grounds could be joined together if desired with the included jumper.

The relay coils run on 5VDC, and the module has screw-terminal blocks for sturdy and reusable attachments for the external load. The signal and power inputs run through the male single-row header. You MUST specially ask for the 12V relay version if you need it. PCB Color may Vary.

Here is a schematic diagram of this board. This diagram shows one of the relay channels; the board contains eight duplicates of this circuit.


Some notes:

The down side of the 12V relay module (VUPN688) is that Ground is not common. In this circumstance Positive is the common. Which means that each relay needs a separate, individual ground connection to activate. As opposed to what people would normally assume where each INput would be a positive contact. It makes this very difficult to use with a microcontroller or in a situation where you want or need to controll something with positive voltage. Since microcontrollers usually use 3.3v or 5v logic, this relay module also could NOT be controlled buy such devices without extra transistors or more circuits that one might want to assemble.



QTY: 1 x 8-Channel Relay Module for Arduino

VUPN688 AKA the 12 volt version is located in the NEW section of the arduno storage area behind the counter.

Click here to read the California regulatory warning.