Home Automation 8-Layer Stackable HAT for Raspberry Pi 360

SKU: SM-H-001

Home Automation 8-Layer Stackable HAT for Raspberry Pi

Name: Home Automation 8-Layer Stackable HAT for Raspberry Pi
Brand: Sequent Microsystems
SKU: SM-H-001
Price: 80.0 USD
Availability: InStock

Eight Relays 3A/24V; Eight 3.3V A/D Inputs; Four 0-10V DAC Outputs; Four 4A/24V PWM Outputs; Eight Digital Inputs. 1-Wire & RS485; Watchdog.

In stock

$80.00

Product variants

Overview

Home automation controller for Raspberry Pi combining relays, analog sensing, 0-10V dimming, PWM outputs, opto-isolated inputs, RS485, and 1-Wire interfaces in a compact, stackable platform for smart home control, monitoring, and automation.

Eight relays and eight opto-isolated digital inputs on one board
12-bit analog inputs and 0-10V DAC outputs for sensing and dimming
Native RS485 and 1-Wire communication interfaces
Up to 8 cards of each type can be stacked and mixed with other Sequent HATs for virtually unlimited I/O expansion
Designed for smart home control, monitoring, and automation
ECCN Code EAR99

Works with Open Automation Software

Compatible with widely used tools for control, monitoring, and system integration.

INTERFACES AND I/O

I/O's	Communication	Software Integration
• Eight Relays 3A/24V with Status LEDs and N.O. Contacts	• I2C Port to Raspberry Pi	• Command Line
• Eight 12-bit Analog Inputs, 0-3.3V, 250 Hz	• RS485 Port	• Python Library
• Four 13-bit DAC Outputs (0-10V)	• 1-Wire Interface	• Node-RED Nodes
• Four PWM 24V/4A Open-Drain Outputs		• Domoticz Plugin
• Eight Optically Isolated Digital Inputs		• CODESYS Driver
• Contact Closure/Event Counters up to 500 Hz		• OpenPLC Module
• Four Quadrature Encoder Inputs		• Home Assistant
		• Arduino
Other Features
• 5V power supply delivers power to Raspberry Pi (up to 5A)
• On-board step-up generates 12V for 0-10V DAC outputs
• 250 Hz sample rate on analog inputs
• Pluggable Connectors 26-16 AWG wires	• On Board Hardware Watchdog and resettable fuse
• Eight Level Stackable	• 26 GPIOs from Raspberry Pi available

DESCRIPTION

The Home Automation HAT provides everything needed to build smart home control, monitoring, and automation systems with Raspberry Pi.

Relays

Eight on-board relays with heavy duty pluggable connectors. Relays are grouped in two sections of four, each with one common terminal and one N.O. contact. Status LEDs show relay state.

Analog Inputs

Eight 12-bit analog inputs read voltage signals from 0 to 3.3V at 250 Hz, suitable for temperature sensors and other analog transducers.

0-10V DAC Outputs

Four 13-bit DAC outputs produce 0-10V signals to control light dimmers and proportional actuators.

PWM Open-Drain Outputs

Four open-drain PWM outputs switch DC loads up to 4A at 24V for direct control of LED strips, solenoids, and motors.

Digital Inputs & Event Counters

Eight optically isolated digital inputs accept signals up to 25V. Inputs can be used as contact closure event counters up to 500 Hz or quadrature encoder inputs.

Hardware Watchdog

The hardware watchdog automatically power-cycles the Raspberry Pi if the software becomes unresponsive, ensuring continuous operation in unattended deployments.

Protection

An onboard resettable fuse protects against accidental shorts. Relay coils are powered from 5V, eliminating the need for a separate relay power supply.

TECHNICAL DETAILS

CARD LAYOUT

Home Automation HAT for Raspberry Pi — pinout

MECHANICAL SPECIFICATIONS

Home Automation Card Mechanical Specifications

JUMPER AND STACKING

The onboard three-position jumper header configures the card's stack address. Up to eight Home Automation HATs can be stacked on a Raspberry Pi. Cards of different Sequent HAT types can be freely mixed in the same stack.

Home Automation HAT stack level jumper

The jumper selects one of eight stack levels (0–7). Cards can be installed in any order. Two jumpers are provided with each card.

ELECTRICAL SPECIFICATIONS

Power
Power supply	Pluggable Connector, 5V / 3A
Power consumption (all relays off)	50 mA
Power consumption (all relays on)	700 mA
Onboard resettable fuse	3 A

Relays 1, 2, 3, 4, 5, 8
Contacts	N.O.
Rating	6 A / 24 VAC or DC

Relays 6, 7
Contacts	N.O.
Rating	3 A / 24 VAC or DC

Analog Inputs
Maximum Input Voltage	3 V
Input Impedance	50 KΩ
Resolution	12 bits
Sample rate	250 Hz

DAC Outputs
Minimum Output Load	1 KΩ
Resolution	13 bits
Accuracy	±1%

Open Drain Outputs
Maximum Output Current	3 A
Maximum Output Voltage	24 V

Opto-isolated Digital Inputs
Input Forward Current	5 mA typical / 50 mA max
Input Series Resistor	1 KΩ
Input Reverse Voltage	5 V
Input Forward Voltage	25 V @ 10 mA

POWER REQUIREMENTS

Power supply: The card can be powered from the Raspberry Pi over the GPIO bus or from its own 5V pluggable power connector. The 5V rail also powers all relay coils. An on-board 5V to 12V step-up power supply generates the voltage required for the 0-10V DAC outputs. A local 3.3V regulator powers the rest of the circuitry. The card consumes 50mA with all relays off and up to 700mA with all relays on.

PLUGGABLE CONNECTORS

All I/Os connect to heavy-duty 3.5mm pitch pluggable screw terminal connectors rated at 8A, accepting wire gauges from 26 to 16 AWG. Connectors can be unplugged from the board for convenient field wiring and debugging without disturbing the rest of the installation.

FIELD CALIBRATION

All analog inputs and outputs are factory-calibrated.
However, firmware commands allow the user to recalibrate the board or perform higher-precision calibration if required.

Calibration is performed using a two-point method. The selected calibration points should be placed as close as possible to the minimum and maximum values of the measurement range.

Input Calibration

To calibrate the analog inputs, the user must apply known analog reference signals. For example, calibrating the inputs requires providing accurate voltage references at the minimum and maximum of the input range.

Output Calibration

To calibrate the DAC outputs, the user must:

Issue a command to set the output to a desired value.
Measure the actual output using a calibrated instrument.
Issue the corresponding calibration command to store the measured value.

Storage and Reset

Calibration values are stored in non-volatile flash memory, and the input transfer curve is assumed to be linear.

If an incorrect command or value is entered during calibration, a RESET command can restore all channels in the selected group to their factory calibration values. After a reset, the calibration procedure can be repeated.

Calibration Without External Sources

The board can also be calibrated without external analog signal sources by:

Calibrating the DAC outputs first, and
Routing the calibrated outputs to the corresponding analog input channels for input calibration.

The following firmware commands are available for performing calibration:

CALIBRATE ANALOG INPUTS:              ioplus <stack> adccal <channel> <value>
RESET CALIBRATION OF ANALOG INPUTS:   ioplus <stack> adccalrst <channel>
CALIBRATE DAC OUTPUTS:                ioplus <stack> daccal <channel> <value>
RESET CALIBRATION OF DAC OUTPUTS:     ioplus <stack> daccalrst <channel>

COMMUNICATION INTERFACES

RS485

The Home Automation HAT includes a standard RS-485 transceiver controlled by the onboard processor. It enables communication with RS-485 devices directly from the Raspberry Pi application.

The operating mode is configured via ioplus commands. Refer to the command-line help for further details.

1-Wire Interface

The Home Automation HAT includes a standard 1-Wire bus for connecting digital temperature sensors. Up to 16 DS18B20 sensors can be connected in parallel on a single two-wire cable, covering large areas such as multi-zone heating systems or distributed monitoring installations. Sensors are accessible from the command line, Python scripts, and Node-RED, making integration straightforward regardless of your software environment.

HARDWARE WATCHDOG

The Home Automation HAT includes a hardware watchdog that ensures your system automatically recovers if the Raspberry Pi software becomes unresponsive. The watchdog is disabled at power-up and activates after it receives the first reset command from the Raspberry Pi.

Watchdog Parameters
Initial timeout period	Configurable — allows time for Raspberry Pi to boot and start the application
Running timeout period	Configurable — normal operating timeout
Off period	Configurable — duration the Raspberry Pi power is cut when timeout triggers
Reset counter	Stored in non-volatile flash; can be read or cleared at any time

For a full list of watchdog commands, run: ioplus -h

COMPATIBILITY

Interface	I2C
GPIO used	GPIO2 (SDA), GPIO3 (SCL) — 2 pins only; remaining 26 GPIO pins stay free
Max stack	8 cards of each type; different Sequent HATs can be freely mixed with virtually no upper limit on total I/O
Compatible with	All Raspberry Pi versions from Zero to 5 (40-pin GPIO header)

FIRMWARE UPDATE

The onboard microcontroller firmware can be updated in the field. The update tool downloads the latest firmware from Sequent Microsystems' servers and flashes it to the board over I2C.

WARNING: Stop all processes that access the card (Node-RED flows, Python scripts, cron jobs) before starting a firmware update. Accessing the card during an update may corrupt the firmware.

Running the Update

~$ cd ~/ioplus-rpi/update/

~/ioplus-rpi/update$ ./update <id>

Replace <id> with the board stack address (0-7). Full instructions including recovery procedures are available at:

https://github.com/SequentMicrosystems/ioplus-rpi/blob/master/update/README.md

DOWNLOADS

User's Guide (PDF)	Schematics (PDF)	CAD	Software & Integrations
User's Guide V3.0	Schematics V4.0	3D STEP Model V4.0	Command Line
User's Guide V4.0	Schematic V5.1	3D STEP Model V5.0	Python Libraries
		2D CAD Drawing	Node-RED Nodes
			Domoticz Plugin
			CODESYS Library
			OpenPLC
			Home Assistant Integration
			Arduino Library
			Customer Application: Train Set Controller

COMPLIANCE

RoHS and REACH Compliance Declaration

WHAT'S INCLUDED

When you purchase the card you will receive the following items:

1. Home Automation Card for Raspberry Pi

2. Mounting Hardware
	Four M2.5×18mm male-female brass standoffs Four M2.5×5mm brass screws Four M2.5 brass nuts

3. Connector Plugs for all Inputs and Outputs
	Nine 5-pin female mating connector plugs One 2-pin female mating connector plug

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 software from GitHub:

~$ git clone https://github.com/SequentMicrosystems/ioplus-rpi.git

~$ cd /home/pi/ioplus-rpi

~/ioplus-rpi$ sudo make install

~/ioplus-rpi$ ioplus

The program will respond with a list of available commands. To read more about the cli, please refer to the README file. If you would rather use a different platform, you can access the same functionality through dedicated, ready-to-use integrations in the Downloads tab above

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Excellent Flexible I/O Platform for Advanced Raspberry Pi Automation

I purchased the Home Automation 8-Layer Stackable HAT as part of a custom BACnet/IP automation controller project running on Raspberry Pi, and the hardware has been extremely capable and flexible.

What impressed me most is the variety of supported input types and how configurable the platform is. We successfully tested and integrated:

* 0-10V inputs
* 0-3.3V inputs
* 4-20mA sensors
* 1K thermistors
* 10K Type 2 thermistors
* 10K Type 3 thermistors
* 20K thermistors
* Dry contact inputs
* Counter inputs

We are using the board as part of a larger BACnet-native automation platform with a custom web UI and controller software running locally on Raspberry Pi. The board has been stable and responsive during commissioning and testing.

The ability to combine universal inputs, analog outputs, relays, and stackable expansion makes this a very powerful platform for industrial, HVAC, pool, irrigation, and custom automation projects.

The Sequent hardware gave us the flexibility needed to build a fully local-first automation controller with BACnet integration and custom engineering logic.

One future enhancement we are planning is using the onboard LEDs more actively within our software platform for live input/output state indication and commissioning diagnostics.

Very happy with the purchase and looking forward to expanding the platform further.

Fast shipping.

Havent used the board yet. Store worked really well, good information and really fast shipping!

Fantastic service from a professional team

I have 9 cards from Sequent in a tall stack, plus two DIN rail mounts. During configuration I detected a rather strange and bizarre side effect. One, and only one, of the GPIO pins would not turn on. Something was holding the signal low.

After contacting Sequent on Saturday, I was pleasantly surprised to get a series of increasingly more detailed suggestions and diagnostics from Sequent. This proceeded, despite time zone differences, over Saturday and Sunday. It culminated with the realisation that two of my cards, obtained from a UK supplier, were of an older spec.

Despite this, Sequent created a new formware upgrade. Installing this, with the excellent and detailed instructions, solved the problem. This meant that by Monday morning the system was fully operational.

This level of detailed and customised service gives me a feeling of trust and confidence, not just in the two Home Autiomation cards, but in Sequent as a company. I am convinced that I have made the best choice for my somewhat complex project by selecting Sequent cards for the integration.

For reference, I have:
2 x Home Automation
2 x Mosfet cards
2 x Power Relays (no/nc)
1 x 16 solid state relays
1 x Smart Fan
1 x GPIO Hat (powering my home build 24 LED indicator board).

I am very proud to be able to recommend Sequent to all builders. They have excellent, well made, cards. The design and construction are first rate. And the support from the company is beyond excellent.

Cannot beat this for Home Automation DYI projects

So many features in so little space, and support is excellent. Helping even a newby like me.

Support

I have had the Home automation Hat for a few years now and I am very happy with it. I recently had a problem and the support was exceptional. I can't remember the last time I got that kind of support. Outstanding!

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