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Small green circuit board with two 13-pin headers and four rows of expansion pins

NuoTo

NuoTo 32 GPIO Expansion Module 8-bit IO Extend Adapter for Raspberry Pi

SKU CH-24GC-XPMD8

Expands a Raspberry Pi with 32 unidirectional GPIO pins via cascadable SPI modules using four 74HC595 chips for stable 8-bit serial or parallel output at up to 100 MHz

  • CPU TypeOther
  • Expands Raspberry Pi with 32 additional GPIO ports
  • Cascades infinitely using 2×13-pin headers for unlimited I/O
  • SPI interface at 100 MHz typical shift frequency ensures stable data transfer
  • Operates reliably from -40 °C to +125 °C across 2.4–5 V supply range
  • Four 74HC595 shift registers provide 8-bit serial input and serial/parallel output

NuoTo 32 GPIO Expansion Module

The NuoTo module adds 32 unidirectional IO ports to a Raspberry Pi using four 74HC595 shift registers. It connects through the 2*13 GPIO header and communicates via SPI at a typical 100 MHz shift-out frequency. The board operates from 2.4 V to 5 V with 3.3 V IO logic and is rated from -40 °C to +125 °C.

Ideal for driving matrix LEDs.

Makers who need more output lines than the Pi provides will benefit from the cascade design that allows unlimited chaining of additional modules. Projects requiring bidirectional pins, analog inputs or higher current drive per channel should look at a different solution because this adapter only supplies 8-bit serial or parallel output.

Cascade port enables unlimited daisy-chaining

A second 2*13 header labelled EXT passes the SPI bus to the next board so each added module contributes another 32 outputs without using extra Pi pins. This single feature determines whether the adapter fits a build that must scale to dozens or hundreds of channels.

Highlights

  • Expands Raspberry Pi with 32 additional GPIO ports
  • Cascades infinitely using 2×13-pin headers for unlimited I/O
  • SPI interface at 100 MHz typical shift frequency ensures stable data transfer
  • Operates reliably from -40 °C to +125 °C across 2.4–5 V supply range
  • Four 74HC595 shift registers provide 8-bit serial input and serial/parallel output

Specifications

CPU TypeOther

Questions about this item

How can I verify the expansion module is working after connecting it to my Raspberry Pi?

Connect a peripheral to the Q0-Q31 headers and run the provided Wiring PI sample code; successful data transmission at up to 100 MHz shift-out frequency confirms the 32 unidirectional IO ports are functioning.

What comes in the box and what extra parts do I need to start using the module?

The module includes 2x13-pin Raspberry Pi headers, a 2x13-pin cascade header, and Q0-Q31 expanded IO headers; you must supply Dupont lines to connect peripherals to the expanded GPIO pins.

Which version or capacity should I choose if I need more than 32 GPIO ports?

This single module provides 32 expanded IO ports using four 74HC595 chips; cascade additional identical modules through the EXT header to add further ports in multiples of 32.

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