The system must detect a simulated recoil event and trigger a flash within <10 ms latency, while rejecting normal handling motion and preventing false triggers.

Targets:

• Latency < 10 ms
• False positive rate < 0.05 per minute of handling (< 0.02 for handgun variant)
• False negative rate < 2% during controlled recoil actuation
• Max repetition rate: 15 pulses/sec (10 for handgun variant)
• Sampling frequency: ≥ 2 kHz

Trigger Detection

Piezo Vibration Sensor (for pulled-trigger actuation)

• Silent
• Simple electronics

Characteristics:

• High-frequency voltage spike
• Large amplitude, short duration (<5 ms)
• Sensitive to local mechanical shock

Concerns:

• If guns are not actually firing (only loose trigger pull), vibration impulse may be weak.