- 8 Relays 4A/120V 8-layer stackable HAT for Raspberry Pi
- 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/MODBUS 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
- Eight Relays Raspberry Pi
- 64 Stations Irrigation Controller using Node-RED
- Command Line
- Python Library
- Node-Red nodes
- OpenPLC module
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 card is compatible with all Raspberry Pi versions from Zero to 4. 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 Supply: 5V/8A pluggable connector with reverse polarity protection
- On board resettable fuse: 3A
- 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
You can write your own application using the
- Four M2.5x18mm male-female brass standoffs
- Four M2.5x5mm brass screws
- Four M2.5 brass nuts
- Plug your 8-RELAYS 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
I've only had it for a week, so i'll update it if I run into issues later. So far, though, it works perfectly and is easy to setup. I'm running it on an Up Squared 6000 that I have on a little wheeled robot (Create 3) to turn on/off a couple of cameras and Herelink RC air unit, and still have room for several more devices.I also really like the connectors. I thought that there were just screw terminals on the board itself, but having them in a socket connector is really convenient.
I'm using this for a hydroponic system controller so I2C and Python library were must haves. The stackable design was candy. All together it's a good product at a reasonable price.
Fantastic card and also Support. Have upgraded from the previous version that had 4 off NO contacts and 4 off NO and NC contacts (which was also a good board). This new version has 8 off NO and NC contacts and a far nicer arrangement of indicator LEDs. The push button switch is a handy feature too. The python library install instructions are simple to follow and "just works". Easy peasy commands to use in Python. Queried with support the voltage ratings (i'm in the UK) and got super fast response that was both technical and helpful.
Great card, very solid and reasonably priced.
I've developed a fermentation control system using this and Node Red which works great and has been rock solid.
I've now got 24 fermenters going with one pi.
We've bought 40 of these boards with a 1/3 of them are missing the standoffs or not enough for all four corners. Not a big deal, but now I have to wait on nylon stand offs so I can complete this project