About Us


Connecting Raspberry Pi to the Real World

Sequent Microsystems designs and manufactures IO Cards for Raspberry Pi. We expand the capabilities of Raspberry Pi with analog inputs and outputs (0-3.3V, 0-10V, 4-20mA), optically isolated inputs from 3 to 240V, on-board relays, event counters, quadrature encoders, 1K/10K thermistors, RTD sensor inputs, RTC with battery backup, RS485/MODBUS communication, MOSFET and TRIAC load drivers. All our cards use only the I2C port for communicating with Raspberry Pi, leaving all the GPIO pins available for other tasks.

Three Sequent cards (Home, Building and Industrial Automation) are "Swiss Army Knife" types, packing all the possible functions in the available space. If extra functionality is desired, each card can be stacked up to eight levels. Additional universal inputs, relays or solid state outputs can be added using compatible cards. Sequent cards can be mixed in any combination.

Build-in hardware watchdogs on all smart cards can cycle the power on Raspberry Pi to ensure that mission critical projects recover if  Raspberry Pi locks up.

All cards use reliable and convenient pluggable connectors and brass mounting hardware. Rated 8A/240V, the connectors offer the most flexible way of wiring Industrial or Home Automation controls.

The Sequent Raspberry Pi family is completed by a Super-watchdog with Li-Ion battery backup, which can keep the system running on battery for hours in case of power failure, and a stackable Smart Fan with proportional fan control which can keep the Raspberry Pi at a preset operating temperature.

Accessories include DIN-Rail adapters for horizontal or vertical mounting, and various breakout cards with screw, spring or pluggable connectors.

We ship using USPS, DHL and UPS. Actual shipping cost is calculated at checkout, with no added handling fees. Most orders are shipped the same day or next day.

Sequent Microsystems has all the building blocks for designing custom I/O cards per your specification. OEM inquiries welcome.