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Eight Relays 4A/120VAC, 24VDC N.O./N.C. contacts and LED indicators; RS485 Port.
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
- Status LEDs and NO/NC contacts
- Eight layer stackable to 64 relays
- Pluggable Connectors 26-16 AWG wires
- 120VAC/4A or 24VDC/4A on each contact
- RS485 Port
- General purpose push-button
- LED indicators on each relay
- Software self-test
-
Uses only I2C port (address 0x20..0x27 or 0x38..0x3f ), all GPIO pins available
- Works with any Raspberry Pi from ZERO to 5
- ECCN Code EAR99
- 64 Stations Irrigation Controller using Node-RED
- Command Line
- Python Library
- Node-Red nodes
- OpenPLC module
- Home Assistant Integration
- CODESYS Driver
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.
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.
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.

- 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

DOWNLOADS
Node-RED 64 Stations Irrigation System: GitHub Instructions
SOFTWARE
You can write your own application using the
YOUR KIT

- Four M2.5x18mm male-female brass standoffs
- Four M2.5x5mm brass screws
- Four M2.5 brass nuts


QUICK START
- Plug your card on top of your Raspberry Pi and power up the system.
- Enable I2C communication on Raspberry Pi using raspi-config.
- 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
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