Adafruit MCP23017 I2C GPIO Expander Breakout - STEMMA QT/Qwiic
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This Adafruit MCP23017 I2C GPIO Expander Breakout has 16 GPIO with matching bottom pad. With 3 address pins, you can have up to 8 on a single bus for a total of 8 x 16 = 128 GPIO on an I2C bus! Solid Arduino and CircuitPython libraries with examples, all ready for this chip Comes with two sticks header, so you can use it in a breadboard, with some soldering. You can also connect free wire buttons by connecting one side to the GPIO (as input with pullup) and connecting the other side to a floor pad. It runs happily from 3V or 5V logic and current. Each GPIO can be an output of up to 25mA so LEDs are no problem.
Description
(1)
This Adafruit MCP23017 I2C GPIO Expander Breakout has 16 GPIO with matching bottom pad. With 3 address pins, you can have up to 8 on a single bus for a total of 8 x 16 = 128 GPIO on an I2C bus! Solid Arduino and CircuitPython libraries with examples, all ready for this chip Comes with two sticks header, so you can use it in a breadboard, with some soldering. You can also connect free wire buttons by connecting one side to the GPIO (as input with pullup) and connecting the other side to a floor pad. It runs happily from 3V or 5V logic and current. Each GPIO can be an output of up to 25mA so LEDs are no problem.
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