Wire the LIS3DH to the ESP32 over SPI (SCK=18, MISO=19, MOSI=23, CS=5). Power from 3.3V. Flash a basic sketch that prints raw accelerometer values over serial.

Implement the bandpass filter and threshold logic. Tune the threshold by dribbling and watching the serial output. You want clean counts with no double-triggers.

et up the GATT service. Test with nRF Connect or LightBlue before writing any app code.

Configure the LIS3DH to generate an interrupt on wake-up motion. Put the ESP32 into light sleep. Measure current draw — you want under 20 mA average.

 We used KiCad with a 2-layer stackup. Keep the antenna area of the ESP32 module clear of copper and components. Route the LIS3DH SPI traces short and away from the antenna.