Pimoroni IO Expander Breakout

PimoroniSKU: RB-Pim-226
Manufacturer #: PIM517

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  • IO Expander Breakout by Pimoroni
  • Offers a Nuvoton MS51 microcontroller
  • Provides reverse polarity protection
  • Includes a male and a female header
  • Built-in 12-bit ADC
  • Interface: I2C
  • Compatible with Raspberry Pi Pico (Not Included)

The Pimoroni IO Expander Breakout uses a clever Nuvoton MS51 microcontroller and some I2C magic to give you a whopping 14 additional input or output pins to connect things up to. Eight of the pins are hooked up to an Analog to Digital Converter.

  • 1x IO Expander Breakout
  • 1x 5 Straight Male Header
  • 1x 5 Right Angle Female Header


  • 26 x 24.5 x 12 mm (L x W x H)
  • Microcontroller: Nuvoton MS51
  • Interface: I2C, default address of 0x18
  • Max I2C speed: 400 kHz
  • 3.3V or 5V compatible
  • Reverse polarity protection: Yes
  • Raspberry Pi-compatible pinout (pins 1, 3, 5, 7, 9)
  • Compatible with Raspberry Pi Pico (not included)

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