Build Phrase Detection Device Prototype (ESP32/NDP120)

Project Description
We are developing a compact, battery-powered device that listens for specific high-risk phrases during live phone conversations and triggers a local alert via a buzzer. The goal is to provide real-time protection against verbal coercion, often used in scams or social engineering attacks.

This job is to create the first working breadboard prototype, based on standard components and capable of detecting a small set of pre-defined trigger phrases.

What You'll Build:
A breadboard prototype using:
ESP32 microcontroller (or equivalent)
NDP120 AI processor (or placeholder MCU with basic detection logic)
MEMS microphone
Blue LED (power indicator)
On/off switch
Rechargeable battery (or removable cell)
Real-time voice phrase detection logic for a basic dataset of 10 trigger phrases (we will supply these)
Local alert mechanism (buzzer) when a phrase is detected

Deliverables:
Fully wired breadboard prototype with all listed components
Working live microphone input detection for 10 predefined phrases (provided)
Clear wiring diagram and component list
Test video or demo of phrase detection working
Physical shipment of the prototype to a UK address
Agreement to sign NDA before starting
All intellectual property remains the sole property of TrustCheck Technologies Ltd

Requirements:
Experience with ESP32, voice/audio input, and low-power electronics
Familiarity with real-time keyword/phrase detection using TensorFlow Lite, NDP120, or similar
Ability to document and clearly explain prototype setup
Willingness to sign a Non-Disclosure Agreement (NDA)

Future Opportunities:
This is Phase 1 of a larger project. Later phases will include:
Miniaturised PCB version
Expanded phrase detection engine
Integration with landline connectors
Full product development with vibration motor and housing