Adafruit GPIO Expander Bonnet - 16 Additional I/O over I2C
The Raspberry Pi is an amazing single board computer - and one of the best parts is that GPIO connector! 40 pins of digital goodness you can twiddle to control LEDs, sensors, buttons, radios, displays - just about any device you can imagine.
Pinout
- GPA0-GPA7
Header A exposes eight MCP23017 GPIO pins; the Learn pinouts page says the bottom row numbered 0-7 is the 8 IO pins.
Type · signal - GPB0-GPB7
Header B exposes eight MCP23017 GPIO pins; the Learn pinouts page says the bottom row numbered 0-7 is the 8 IO pins.
Type · signal - GND headers
The Learn pinouts page states the top row of each GPIO header is ground.
Type · ground - STEMMA QT
On-board STEMMA QT connector for I2C plug-and-play peripherals on the Bonnet.
Type · signalVoltage · I2C logic level shifted from Raspberry Pi 3V logic; Bonnet GPIO side defaults to 5V per Learn page. - INTA
MCP23017 interrupt output pin exposed on the Bonnet for GPIO change notification.
Type · signal
Start wiring
I2C logic level shifted from Raspberry Pi 3V logic; Bonnet GPIO side defaults to 5V per Learn page. · Default 5V, selectable 3V
Confirm the data interface matches your host board.
Module pins: 3V/5V jumper, GND headers, GPA0-GPA7, GPB0-GPB7, STEMMA QT, INTA, INTB. Schematik maps them to your board in the app.
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