Thanks to Drew for sharing – via Gadget Explained.
Do you want a crazy amount of Digital Input and Output (Digital I/O) in a small space without upgrading your microcomputer?
You can achieve this with the DIGIO-128 super-mega digital I/O card. The DIGIO-128 lets you add 128 GPIO (General Purpose Input/Output) lines, thanks to the Microchip MCP23017, which is a 16-bit general purpose parallel I/O port expander with I2C two wire serial interface and 28-pin ICs that supports 100kHz and 400kHz.
The 128 digital I/O lines are accessed via 8 I/O connector pins, each offering 16 digital I/O, 2 power and 2 ground. The distance between the pin connectors (pitch) is 0.1″. DIGIO-128 uses 8 Microchip MCP23017 in total, offering 16 inputs or outputs each and a maximum of 128 extra I/O ports.
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