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Industrial I/O for Raspberry Pi - Built for Real-World Automation

Replace or extend automation systems using industrial-grade, stackable I/O cards with watchdog protection, isolation, and native Modbus support.

Engineered for Reliability & Scale

A modular ecosystem trusted by engineers replacing PLCs in Industrial Automation, Building Automation, and OEM systems.
  • Stackable Architecture: Virtually unlimited scalability.
  • Self-Recovery: Hardware Watchdog for total reliability.
  • Pro-Grade Analog: Supports 4-20mA and 0-10V I/O.
  • Sensors: Direct inputs for RTD, Thermocouples, & Thermistors.
  • Protection: Opto-isolated digital I/O for harsh environments.
View Industrial I/O Solutions

FREE DIN-RAIL KIT WITH ANY HAT OVER $100

For a limited time, every Industrial HAT purchase over $100 includes a Professional DIN-Rail Mounting Kit at no extra cost.

Claim your bonus:

  • Select your HAT: Add any Industrial, Building, or DAQ HAT ($100+) to your cart.
  • Choose your Mount: Add either a DIN-Rail Kit Type 1 or Type 2 to your cart.
  • Automatic Discount: The mounting kit price will drop to $0.00 automatically at checkout.

Industrial I/O & PLC Expansion Modules

Industrial Automation 8-layer stackable HAT for Raspberry Pi with analog and digital inputs, RS485 port, real-time clock, and pluggable connectors.
In stock

Industrial Automation 8-Layer Stackable HAT for Raspberry Pi

Four Digital Inputs, four 0-10V Inputs and Outputs, four 4-20mA Inputs and Outputs, four 4A/24V Outputs, 1-Wire, RS485, Watchdog, RTC.
(10)
$120.00
Multi-IO HAT v2.0 industrial automation expansion board for Raspberry Pi with digital inputs, RTD ports, analog I/O, relays, servo control, and serial communication ports.
In stock

Multi-IO HAT 8-Layer Stackable for Raspberry Pi

Four digital Inputs, 2xRTD ports, 2x0-10V Inp and Out, 2x4-20mA In and Out, 2x5A/24V Relays, 2xServo ports, H-Bridge Motor, RS485, RS232, Watchdog.
(7)
$100.00
Sixteen Relays 2A 24V 8-layer stackable HAT for Raspberry Pi with DIP switches and pluggable connectors.
In stock

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

Sixteen relays with status LEDs and Normal Open contacts; RS485 and Hardware Watchdog.
(7)
$80.00
Eight Thermocouples DAQ 8-layer stackable HAT for Raspberry Pi with RS485, supports multiple thermocouple types, DIP switches, and 24-bit A/D converters.
In stock

Eight Thermocouples DAQ 8-Layer Stackable HAT for Raspberry Pi

Read eight thermocouples type J, K, T, N, E, B, R and S; 0.1% accuracy through calibration; RS485, Watchdog.
(14)
$95.00
Sixteen Analog-Digital Inputs for Raspberry Pi top view
In stock

Sixteen Analog-Digital Inputs 8-Layer Stackable HAT for Raspberry Pi

Sixteen Inputs: 1K/10K Thermistors, 0-10V, Dry Contact, Event Counters; RS485/MODBUS; RTC; Hardware Watchdog.
(2)
$95.00
Building Automation 8-layer stackable HAT for Raspberry Pi with software selectable universal inputs, RS485 port, and real-time clock.
In stock

Building Automation 8-Layer Stackable HAT for Raspberry Pi

Eight universal inputs: 1K/10K Thermistors, 0-10V, Dry Contact; Four 24VAC outputs; Four 0-10V outputs; 1-Wire, RS485, RTC, Watchdog.
(7)
$100.00
Home Automation HAT top view
In stock

Home Automation 8-Layer Stackable HAT for Raspberry Pi

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.
(32)
$80.00

Scale Without Redesign

Unlike single-function boards, Sequent Microsystems HATs stack up to eight of each type, allowing you to expand I/O as requirements grow - without changing software or architecture.

Testimonials

What engineers say after deploying our hardware in real automation environments.

Charles M., Lincoln WA

Industrial board

Like everything I have bought from Sequent, just works. When I came across a weird thing with a sensor I was trying to use I hit up the chat at 8:30PM, sure enough they were right there to get me fixed up. Great products, and even better support.

Robert S., Roseville CA

Awesome I/O Card

When I needed to a card that supported 4-20mA inputs I found this one. Amazingly it also allowed me to eliminate a 5v power supply and a couple of other cards that I was using for ADC inputs.

If that's not enough, I use it to monitor cpu temperature and power supply voltage to boot. From now on it will be the first card in the stack for all future pi projects.

Tracey L., Durham NC

Great Product - Great Man - Great Company

Huge fan of Sequent Microsystems products for use - well, anywhere. I have used in a commercial startup product, industrial automation in factories, in my house and on my boat. I would have designed in the same manner (the drivers are open source and easily modified, source of learning, maintainable in the future). I could go on and on but I have to get back to the command line.


Trusted by engineers replacing PLCs in:

- Industrial automation
- Building automation
- Energy monitoring
- Test & measurement
- OEM products
- Home automation

RS485/Modus
Industrial I/O ranges
Watchdog recovery
Stackable architecture

Why Engineers Choose Sequent Microsystems

Sequent Microsystems bridges the gap between a low-cost computer and industrial systems. Our stackable I/O ecosystem allows engineers to scale inputs and outputs reliably - without custom hardware, fragile wiring, or hobby-grade limitations.

  • Industrial Reliability

    Hardware watchdogs automatically recover frozen Raspberry Pi systems in unattended environments.

  • Scalable Architecture

    Stack up to eight HATs of each type to build systems ranging from small panels to large distributed I/O.

  • Built for Professionals

    CODESYS support, native Modbus, OpenPLC, isolated inputs, and industrial I/O ranges.