Located in Cupertino, California, Sequent Microsystems designs and manufactures IO Expansion 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 and outputs, on-board relays, 1K, 10K and RTD temperature sensor inputs, solid state drivers, CAN and RS485 communication; We have all the building blocks for implementing custom IO cards per your specification. Opto-isolated digital inputs from 3V to 250V with closure counters Analog inputs for voltage, resistance and temperature measurement Relays and solid state outputs driving up to 10A/250V AC and DC loads 4-20mA and 0-10V inputs and outputs for industrial sensors and actuators PWM outputs capable of driving 10A loads RTD Data Acquisition up to 64 channels DIN-RAIL kits for horizontal or vertical mounting Breakout cards with Screw, Spring or Pluggable terminals Heavy duty pluggable connectors and brass hardware mounting Stackable to 8 layers for almost unlimited expandability