INT1, SDA, SCL connections for LIS3DH

[fellowhobbyist]

I’m trying to build a device that detects shaking using a LIS3DH, and then interrupts a Seeed XIAO RP2040 so that it can tell an OLED display to show numbers. I am using an LIS3DH in I²C mode. I want INT1 on the LIS3DH to wake a Seeed XIAO RP2040 from sleep when motion exceeds a threshold. Do I need to use INT1, SDA, and SCL, or could I just use INT1 to make this work? I’ve attached an electrical schematic of what I have right now, but I’m not quite sure if the connections between the LIS3DH and Seeed XIAO RP2040 are correct. 

 

[TDK]

Do I need to use INT1, SDA, and SCL, or could I just use INT1 to make this work?

You’ll need to connect SDA/SCL to the LIS3DH in order to configure it. Once configured, it INT1 pin will provide the interrupt at the appropriate time.

I2C needs external pullup resistors.

The pin number on your schematic don’t match the data sheet.