This breakout ships with a protector over the sensor. It must be removed before use! See details at the bottom of the Overview page.

Power Pins

  • VIN - This is the power pin. To power the board, give it the same power as the logic level of your microcontroller - e.g. for a 3V microcontroller like a Feather M4, use 3V, or for a 5V microcontroller like Arduino, use 5V.
  • GND - This is common ground for power and logic.

I2C Logic Pins

The default I2C address for the SCD-4x is 0x29.

  • SCL - I2C clock pin, connect to your microcontroller I2C clock line. There's a 10K pullup on this pin.
  • SDA - I2C data pin, connect to your microcontroller I2C data line. There's a 10K pullup on this pin.
  • STEMMA QT - These connectors allow you to connect to development boards with STEMMA QT connectors or to other things with various associated accessories.

Other Pins

  • GPIO - This is the interrupt output pin, it is 2.8V logic level output - it can be read by 3.3V and most 5V logic microcontrollers
  • XSHUT - This is the shutdown pin. It is active low, and is logic-level shifted so you can use 3V or 5V logic.

Jumper

  • LED jumper - This jumper is located on the back of the board. Cut the trace on this jumper to cut power to the "on" LED.

This guide was first published on Oct 27, 2021. It was last updated on 2021-10-27 14:20:34 -0400.

This page (Pinouts) was last updated on Nov 22, 2021.

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