Sure, let’s start by picking the right sensor type. For motion detection a 9‑DOF IMU or a simple PIR can work, but if you need sub‑centimeter precision consider an optical flow camera. The key is to calibrate the threshold so the pixels only trigger on intended motion and add a debounce routine to avoid jitter. Tell me which hardware you’re using and I can sketch a quick flow.

Use a simple low‑pass filter first, say a 10‑sample moving average on each axis to kill high‑frequency noise. Then set your threshold to about 0.3g—just above static tilt but below typical human hand swings. Debounce can be a 50‑ms window where you only accept a new trigger if the filtered value stays above threshold for that whole period. Once you add the camera, switch to the optical flow algorithm and let it provide the raw velocity; you’ll get a much smoother activation. Good luck, and don’t let the ESP32’s watchdog kill you—watch the reset logs.

Just keep an eye on the voltage rails too; the ESP32 can eat power when the camera wakes up. If you hit a reset, double‑check the supply decoupling and add a small capacitor on the 3.3V rail. Happy tinkering!