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.
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.
I2C data from Raspberry Pi header to expander.
I2C clock from Raspberry Pi header to expander.
Selectable I/O/power rail jumper, defaults to 5V.
Ground return.
Interrupt output for GPIO change notification.
Interrupt output for GPIO change notification.
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| SDA | Raspberry Pi header / I2C bus | i2c | I2C data from Raspberry Pi header to expander. | |
| SCL | Raspberry Pi header / I2C bus | i2c | I2C clock from Raspberry Pi header to expander. | |
| 3V/5V | 3V/5V jumper | power | Selectable I/O/power rail jumper, defaults to 5V. | |
| GND | Raspberry Pi header | ground | Ground return. |
I2C
Confirm the data interface matches your host board.
Module pins: 3V/5V, GND, SDA, SCL. Schematik maps them to your board in the app.
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| INTA | IRQ pads | digital io | Interrupt output for GPIO change notification. |
| INTB | IRQ pads | digital io | Interrupt output for GPIO change notification. |