Bridging Raspberry Pi to the Real World
The Raspberry Pi is a compact yet powerful platform, ideal for IoT, home, and industrial automation projects. However, it lacks native I/O capabilities to directly interact with sensors and devices. At Sequent Microsystems, we fill that gap with reliable, feature-rich I/O expansion HATs for Raspberry Pi.
Our Product Capabilities
We design and manufacture cards that extend the Pi’s functionality with:
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Analog inputs/outputs: 0–3.3 V, 0–10 V, 4–20 mA
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Optically isolated inputs: 3–240 V AC/DC
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Relays and solid-state outputs (2–16 channels)
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Event counters and quadrature encoders
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Thermistor, thermocouple, and RTD sensor support
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RTC with battery backup
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Communication: RS485/MODBUS, RS232, RS422, CAN, M-BUS, 1-Wire
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MOSFET and TRIAC load drivers
Stackable & Flexible Designs
All HATs communicate with Raspberry Pi through the I²C interface, leaving GPIO pins free. Most are stackable up to eight layers, enabling flexible configurations. Our “Swiss Army Knife” HATs for Home, Building, and Industrial Automation integrate multiple features into a single board for maximum versatility.
Built for Reliability
We engineer every board for demanding environments. Key features include:
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Hardware watchdogs to reset the Pi if unresponsive
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Pluggable terminal blocks for robust connections (16–28 AWG, 8 A/300 V)
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Brass spacers for secure stacking
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Wide power support: 12–24 V input, up to 5 A output to the Pi
Complete Ecosystem
Our product line also includes:
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Super-Watchdog with battery backup, for power-loss resilience
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Stackable Smart Fan for efficient cooling
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DIN-rail kits and breakout boards for wiring flexibility
Open Source Commitment
Every Sequent Microsystems board is open source. We provide schematics, command-line tools, Python libraries, and support for Node-RED, OpenPLC, Arduino, and more via GitHub.
Custom Development
Many of our solutions originated as customer requests. We welcome custom controller projects—with or without Raspberry Pi—delivering high-quality, affordable hardware for OEMs and automation professionals.
Contact us today to explore how Sequent Microsystems can power your next automation or IoT project.