I2C breakout (STEMMA QT / Qwiic) that drives up to eight solenoids via MOSFET outputs using an MCP23017 GPIO expander. Additional GPIO pins are broken out on a lower header row for general use.
One grouped connection is listed in the table but omitted from the graphic until individual pins are available.
| Pin | Type |
|---|---|
| Vcc | Power |
| V++ | Power |
| GND | Ground |
| GND pads | Ground |
| SCL | I2C |
| SDA | I2C |
| STEMMA QT connectors | I2C |
| Solenoid outputs +V+ | Power |
| Solenoid outputs 0-7A0-A7 | USB |
| B0-B7 GPIO row | GPIO |
| INT | Signal |
| Red LED | Unknown |
| Green LEDs | Unknown |
| LED jumper | Unknown |
| Address jumpers | Unknown |
One grouped connection is omitted from the graphic until individual pins are available.
PWM · I2C · UART · Wide input · Breakout
Confirm the data interface matches your host board.
Module pins: Vcc, GND, GND pads, SCL, SDA, B0-B7 GPIO row. Schematik maps them to your board in the app.
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