Remote Firework Detonator

Design Objective

The objective was the rapid assembly and deployment of a wireless, high-energy pyrotechnic detonation system. The system was engineered within a 30-minute window to facilitate remote ignition of a propellant-based rocket from a safety-critical distance.

Architecture

The system utilizes a 3S LiPo battery for high-current discharge. Command logic is handled by an ESP32-C3 microcontroller interfacing with a dedicated RF receiver module. The ignition node consists of a custom-fabricated resistive element created by tightly wrapping a match-head with high-gauge enamel copper wire. Upon relay activation, the resistive bridge experiences rapid Joule heating, inducing localized combustion.

Operational Failure Analysis

Despite successful bench validation of the ignition sequence, the system failed to initiate the propellant charge during field deployment in high-humidity (precipitation) conditions.

• Root Cause: The custom "match-bridge" igniter assembly exhibited extreme hygroscopy. Rapid atmospheric moisture absorption in the field degraded the chemical reactive properties of the match-head faster than the thermal input from the resistive wire could compensate.
• Outcome: Insufficient thermal energy to sustain combustion; ignition sequence aborted.
• Corrective Actions: Future designs require industrialized bridgewire igniters or e-matches with hydrophobic coatings and specialized ruggedized connectors to maintain electrical integrity in adverse environmental conditions.