Sixteen Relays 2A/24V 8-Layer Stackable HAT for Raspberry Pi

SKU: SM-I-013

Sixteen Relays 2A/24V 8-Layer Stackable HAT for Raspberry Pi

Name: Sixteen Relays 2A/24V 8-Layer Stackable HAT for Raspberry Pi
Brand: Sequent Microsystems
SKU: SM-I-013
Price: 60.0 USD
Availability: InStock

Sixteen relays with status LEDs and Normal Open contacts; RS485 and Hardware Watchdog.

In stock

$60.00

Product variants

FEATURES

All Relays with Status LEDs and NO contacts
Eight layer stackable to 128 relays
Pluggable Connectors 26-16 AWG wires
5V power supply powers also Raspberry Pi
24V/2A AC/DC on relay contacts
On board hardware watchdog
RS485 Port
General purpose push-button
8 LEDs showing status of groups of 8 relays
Software self-test
Uses only I2C port, all GPIO pins available
Works with any Raspberry Pi from ZERO to 5
ECCN Code EAR99
Command Line
Python Library
Node-Red nodes
OpenPLC module
CODESYS Library
Home Assistant Integration
Arduino Library

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 128 relays to each Raspberry Pi in a compact form factor.

Pluggable connectors make the card easy to use when multiple cards are stacked up. Relays have N.O. contacts and can switch 24V/2A AC/DC.

Bicolor 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 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 Sixteen 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.

LED INDICATORS

A power LED shows when power is applied to the board. Due to space limitations, bicolor LEDs are used to shows the status of groups of 8 relays.

DIP SWITCH CONFIGURATION

A six position DIP switch is used to select the source of the RS485 port and the position of the card in the stack, if multiple cards are used.

DIP Switch Selection

STACKING MULTIPLE CARDS

Up to eight Sixteen 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.

RS485/MODBUS PORT

The card has an RS485 port which can be driven from the Raspberry Pi, or from the local processor. Leave the TX and RX switches in the OFF position to connect the port to the local processor. Set both to ON to connect to USART1 of the Raspberry Pi.

When DIP Switches are ON, Raspberry Pi can communicate with any device with an RS485 interface. In this configuration the card is a passive bridge which implements only the hardware levels required by the RS485 protocol. To use this configuration, you need to tell the local processor to release control of the RS485 bus:

~$ 16relind [0] rs485wr 0 0 0 0 0

When DIP Switches are OFF, the card operates as MODBUS slave and implements the MODBUS RTU protocol. Any MODBUS master can access all the card's inputs, and set all the outputs using standard MODBUS commands. A detailed list of commands implemented and parameters addresses can be found on GitHub:

In both configurations the local processor needs to be programmed to release (jumpers installed) or control (jumpers removed) the RS485 signals. See the command line online help for further information.

RS485 TERMINATOR

The last position on the DIP switch is the RS485 line terminator. Set it to ON if the card is last on the RS485 chain.

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 Sixteen Relays card 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.

HARDWARE WATCHDOG

The Sixteen Relays card contains a built-in hardware watchdog which will guarantee that your mission-critical project will recover and continue running even if Raspberry Pi software hangs up. After power up the watchdog is disabled, and becomes active after it receives the first reset or first period set.

The default timeout is 120 seconds. Once activated, if it does not receive a subsequent reset from Raspberry Pi within 2 minutes, the watchdog cuts the power and restores it after 10 seconds.

Raspberry Pi needs to issue a reset command on the I2C port before the timer on the watchdog expires. The timer period after power up and the active timer period can be set from the command line. The number of resets is stored in flash and can be accessed or cleared from the command line. All the watchdog commands are described by the online help function.

CARD LAYOUT

ELECTRICAL SPECIFICATIONS

Power Supply: 5V/8A pluggable connector with reverse polarity protection
On board resettable fuse: 3A
Relays: NO contacts, 2.5A/24 VAC/DC
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

SIXTEEN Relays 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 Sixteen Relays 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. Sixteen Relays HAT for Raspberry Pi

16 Relays HAT for Raspberry Pi

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

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 16-RELAYS software from github.com:

- ~$ git clone https://github.com/SequentMicrosystems/16relind-rpi.git
- ~$ cd /home/pi/16relind-rpi
- ~/16relind-rpi$ sudo make install
- ~/16relind-rpi$ 16relind

The program will respond with a list of available commands.

Very Easy to get working, impressive support!

I got this so I could control relays with a custom program, and I found the documentation and sample programs on the product page on the Sequent Microsystem website very helpful. I don't mind the shared commons, but I can see how that could be an issue for some applications, I can see why they did that though, because jamming 16 relays on a Raspberry Pi HAT is not easy to do. The I2C interface is GREAT! It leaves all my GPIO for other uses, and the boards are properly stackable, which is not always the case with Raspberry Pi relay boards.

The customer support is EXCELLENT, and the product listing on the Sequent Microsystems website is really above and beyond what is normally available for this kind of product! It includes source code to control it from multiple options like python, command line, node-red and even Arduino, even though it's for Raspberry Pi, you could wire it to an Arduino and if you do, they give you the library to run it! Not only that, but what's really impressive, is they have 2D Cad files, and 3D Solid models of the board! So, you can very easily design a case to go neatly around all the connectors, etc. I'm very impressed with the level of detail and the wealth of resources available on the Sequent Microsystems website!

They also have this exact same board with Solid State relays, and I was VERY happy to find out the solid state relays work like true relays, being able to control both AC and DC loads, so if you have an application that requires a lot of switching that would wear out a mechanical relay, the solid state relay version is definitely the way to go!

I found this very easy to get working, just plugged it onto my pi and I had it controlling relays in a matter of just a few minutes. I wish all the manufactures of Raspberry Pi and Arduino boards had the level of information that Sequent Microsystems has available for this board!

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!

Great idea (I2C control 16 relays on 1 card), works perfect and more.

Good useful product,
People who stand behind the product,
Great customer service.
Its a trifecta !

Works fantastically, software improvments delivered quickly

Great product works exactly as advertised. They even promptly put the python library on pypi for easier installation with pip on request. Highly recommend for any generic low frequency controlling needs.

Support == Awesome!!

The board works great with codesys so far with a modified library/device file.

The boards were out of stock and the team at Sequent Microsystems went out of the way to get us some ASAP and the whole communication was exceptionally well!!

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