Uploaded April 2022 | Updated September 2026, 2 weeks ago

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PCBWay Supports High Precision Advanced PCBs: pcbway.com
This is a 32 channel driver pcb intended to drive relays and solenoids, or other resistive or inductive loads.
It uses ULN2803 transistor drivers for the output control, and the logic is controlled by a pair of MCP23017 GPIO expanders over I2C.

Sketch/Schematic: github.com/GadgetReboot/Relay_Solenoid_Driver
PCBs at PCBWay.com: pcbway.com/project/shareproject/MCP23017_Based_32_Ch_Relay_and_Solenoid_Driver_with_I2C_Control_b04fb617.html
MCP23017 Datasheet: ww1.microchip.com/downloads/en/devicedoc/20001952c.pdf
ULN2803 Datasheet: ti.com/lit/ds/symlink/uln2803a.pdf

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