Home » Eight Relays 4A/120V 8-Layer Stackable HAT for Raspberry Pi
Eight Relays 4A 120V 8-layer stackable relay HAT board for Raspberry Pi with RS485 port and DIP switch
Eight Relays 4A 120V stackable HAT for Raspberry Pi with status LEDs, pluggable connectors, and push-button.
Eight Relays 4A/120V 8-layer stackable relay HAT mounted on Raspberry Pi with blue relays and green pluggable connectors.
Eight Relays 4A/120V 8-layer stackable relay HAT mounted on Raspberry Pi with blue relay modules and green pluggable connectors
Eight Relays 4A 120V 8-layer stackable HAT module with pluggable connectors for Raspberry Pi control.
Eight Relays 4A 120V stackable HAT circuit board for Raspberry Pi with labeled relay contacts and connector pins
Eight Relays 4A 120V 8-layer stackable relay HAT board for Raspberry Pi with RS485 port and DIP switch
Eight Relays 4A 120V stackable HAT for Raspberry Pi with status LEDs, pluggable connectors, and push-button.
Eight Relays 4A/120V 8-layer stackable relay HAT mounted on Raspberry Pi with blue relays and green pluggable connectors.
Eight Relays 4A/120V 8-layer stackable relay HAT mounted on Raspberry Pi with blue relay modules and green pluggable connectors
Eight Relays 4A 120V 8-layer stackable HAT module with pluggable connectors for Raspberry Pi control.
Eight Relays 4A 120V stackable HAT circuit board for Raspberry Pi with labeled relay contacts and connector pins
SKU: SM-H-002

Eight Relays 4A/120V 8-Layer Stackable HAT for Raspberry Pi

Eight Relays 4A/120VAC, 24VDC N.O./N.C. contacts and LED indicators; RS485 Port.

In stock
$45.00

Add eight 4 A/120 VAC (24 VDC) relays with N.O./N.C. contacts to any Raspberry Pi (Zero–5) using this 8-layer stackable HAT. Pluggable connectors and LED status simplify wiring and debug, while a front-edge push-button enables safe shutdown. The Eight Relays Card uses only I²C (leaving GPIOs free), stacks up to 64 relays, includes an RS485 port, and ships with CLI/Python/Node-RED integrations for fast setup.

FEATURES

DESCRIPTION

Perfect add-on to your project when you have to control large number of loads. Stackable to 8 layers, the card can add up to 64 relays to each Raspberry Pi in a compact form factor.

Pluggable connectors make the Eight Relays Card easy to use when multiple cards are stacked up. All relays have NO and NC contacts and can switch 120VAC/4A or 24VDC/4A.
Status LEDs conveniently grouped on one side of the board show when relays are on or off. A power LED shows when power is applied. A reset switch permits shutting down the Raspberry Pi without the use of a keyboard and monitor.
COMPATIBILITY
The Eight Relays Card is compatible with all Raspberry Pi versions from Zero to 5. All stacked cards share the I2C bus using only two of the Raspberry Pi’s GPIO pins to manage all eight cards.  This feature leaves the remaining 24 GPIOs available for the user.
 
POWER REQUIREMENTS
The Eight Relays Card needs 5V to operate and can be powered from Raspberry Pi or from it's own 2 pin pluggable connector. The relay coils are also powered from the 5V.  The card draws 10mA with all relays off. Each relay needs about 80 mA to turn on. If power is applied to the board's connector, no other power supply is needed for the Raspberry Pi.

STACKING MULTIPLE CARDS

Up to 8 Eight Relays Cards can be stacked on your Raspberry Pi. Three positions of the configuration DIP Switch labeled ID0, ID1, ID2 are used to select the stack level. Cards can be stacked in any order.

RESET PUSHBUTTON
Shutting down the Raspberry Pi by turning off the power can result in SD Card failure. To prevent this, a shutdown command needs to be used before power cut-off. But this requires a monitor, keyboard and mouse connected to the Pi. 
A momentary on push button installed at the edge of the board provides a convenient way to shut down the Raspberry Pi. The button is routed to pin 37 (GPIO 26). You need to write a script which monitors this pin, and if pressed for more than a desired time, issues the shut-down command.
CARD LAYOUT
ELECTRICAL SPECIFICATIONS
  • Power Supply: 5V/8A pluggable connector 
  • On board resettable fuse: 5A
  • Relays: NO/NC contacts, 4A/120 VAC - 24 VDC
  • Electrical endurance: minim 105 cycles at 1,800 operations per hour, full load
  • Mechanical endurance: minim 107 cycles at 18,000 operations per hour, no load
MECHANICAL SPECIFICATIONS
 

DOWNLOADS

SOFTWARE

SOFTWARE INTERFACES
You can write your own application using the 
Command Line or Python Libraries provided. No programming is required if you use the Node-Red nodes we supply. You can drag-and-drop the functional blocks to design your application. Examples are provided at GitHub.
 
RELAY SELF TEST
The card can be tested before installation by running a simple command from the command line. The card will cycle each relay on and off at 0.5 seconds interval. The clacking noise of the relays and the lighting of the LEDs will assure that all relays are functioning.
ACCESSORIES
DIN-RAIL MOUNTING
The card can be installed parallel on a DIN-Rail using the DIN-Rail Kit Type 1, or perpendicular using the DIN-Rail Kit Type 2.

YOUR KIT

When you purchase the card you will receive the following items:
1. Eight Relays HAT for Raspberry Pi
Eight Relays HAT
2. Mounting hardware
  • Four M2.5x18mm male-female brass standoffs
  • Four M2.5x5mm brass screws
  • Four M2.5 brass nuts
4. Connector plugs

QUICK START

  1. Plug your card on top of your Raspberry Pi and power up the system.
  2. Enable I2C communication on Raspberry Pi using raspi-config.
  3. Install the 8-RELAYS software from github.com:
  • ~$ git clone https://github.com/SequentMicrosystems/8relind-rpi.git
  • ~$ cd /home/pi/8relind-rpi
  • ~/8relind-rpi$ sudo make install
  • ~/8relind-rpi$ 8relind
The program will respond with a list of available commands.

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Customer Reviews

Based on 13 reviews
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W
William Brown
Solid Hardware

One of these has been running in our hot, dusty plant for almost two years. I think it will outlast the Pi.

M
Mark Nathern
Great Product…

Perfect

K
K.W.
Fantastic products, even better support!

I am fairly new to Raspberry Pi, and I am happy I found Sequent. The products are top notch... I now have 2 of the 8-hat relays, (1) 16 hat relay, (1) Building Automation hat, and (2) of the fans.
The only thing I can say that is more positive than their products is their support. You cant find service like they offer much anymore... and it is very appreciated!

If there is something you need or that can help make the product better, hit them up on chat... they respond very quickly and they actually listen.
Thanks Sequent!

S
Steven Bailey
Works perfectly with Nodejs Nixie pool controller

Its in tbe title!
Going to have to make a universal devices Inc. Plugin for these just need to get the python code for each.
More will be used here definitely!

User picture
D
Digikey Customer
Good quality HAT

Not much to say except it works as expected. Can be mixed and matched with many orher cards from Sequent with the same form factor, enabling you to build a complex automation system.

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