The default I2C address is 0x44.

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 5V micro like Arduino, use 5V
• GND - common ground for power and logic

I2C Logic Pins

• SCL - I2C clock pin, connect to your microcontroller's I2C clock line. This pin can use 3-5V logic, and there's a 10K pullup on this pin.
• SDA - I2C data pin, connect to your microcontroller's I2C data line. This pin can use 3-5V logic, and there's a 10K pullup on this pin.
• STEMMA QT - These connectors allow you to connect to dev boards with STEMMA QT (qwiic) connectors or to other things with various associated accessories

Address Pin and Jumper

• ADDR - The address pin for setting the I2C address. You can chain up to two of these boards together on one I2C bus. Leave this pin low for default I2C address 0x44 or tie it high for I2C address 0x45.
• Addr Jumper - On the back of the board is the address jumper, labeled Addr. You can leave this jumper closed (low) to keep the board on the default I2C address 0x44. Cut the jumper open (high) to change the I2C address to 0x45.

Interrupt Pin

Power LED and LED Jumper

• Power LED - In the upper left corner, above the STEMMA connector, on the front of the board, is the power LED, labeled on. It is a green LED.
• LED jumper - This jumper, labeled LED on the board silk, is located on the front of the board, in the upper left corner. Cut the trace on this jumper to cut power to the "on" LED.