8 relays module

Control the world around you with the help of relays

Here is 8 relay board ready to use with your 5 & 3.3 volts based micro controller or nano-computer projects.

This board does offer all the electronic to control and power the 8 relays... each one being able to commute up to 10 Amp under 250V AC (the whole thing protected with optocouplers to keep your Arduino safe and secure). The advanced user will appreciate the COM-GND jumper which allows to separate the opto-coupler ground from Logic control and relay power supply ground (VCC is still 5 Volts). You just need to remove the jumper and use the COM as the common ground for the optocouplers.

Convenient, this board will offer a galvanic isolation between the low voltage components (your Arduino) and the high voltage load (the relay + your load wired to the relay).

Description

The pins follow the standard 2.54mm spacing (like breadboards). Then, you can use molex connector or dupont wires (please see our wire assortment). The power contacts of the relays are routed to 5mm screw terminals (3 contacts terminals).

The board has 4 fixing holes (3mm diameter).

Usage

To activate a Rx relay, you have to draw the corresponding INx pin to the high level (3.3V or 5V).
If the potential is not driven to the high or low level than it will be floating.

Warning: the 1KOhms resistor will limit the current thought the optocoupler diode which have a typical reverse voltage of 1.2Volts.

• Under 3.3V logic the PIN current flow will be (3.3-1.2)/1000= 0.0021A = 2mA
• Under 5.0V logic the PIN current flow will be (5-1.2)/1000= 0.0038A = 4mA

Technical details

• compact module.
• Indicator LED indicating the relays states.
• Using a flyback diode
• Each relay need 63mA under 5 Volts when activated
• Input pin sinks.
  
  • VCC = 5 Volts => activating current = 4 mA (current sink to the COM ground)
  • VCC = 3.3 Volts => activating current = 2 mA (current sink to the COM ground)
• Size: 140 x 55mm (hauteur: 18mm)