To use the 3V to 5V booster breakout, plug a 3V microcontroller power, ground, SCL and SDA pins into the 3V logic inputs. Then, wire up a breakout board to the 5V logic outputs. The breakout board will now receive 5V logic.

You can use STEMMA QT cables to connect to the logic booster.

  • Plug the 3V microcontroller into the 3V input STEMMA QT port located behind the arrows on the board silk.
  • Plug a STEMMA breakout board into the 5V output STEMMA QT port located in front of the arrows on the board silk.

You can also use standard 0.100" pitch headers to wire it up on a breadboard:

3V Logic Input

  • Board 3V to booster VIN
  • Board GND to booster G
  • Board SCL to booster 3CL
  • Board SDA to booster 3DA

5V Logic Output

  • Booster 5V to breakout VIN
  • Booster G to breakout GND
  • Booster 5DL to breakout SDA
  • Booster 5CL to breakout SCL

This guide was first published on Jan 10, 2023. It was last updated on Mar 08, 2024.

This page (Wiring) was last updated on Mar 08, 2024.

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