Shopster — Mobile Loyalty
Mobile loyalty with ultrasound auto-checkins
// Built with
objective-c AVFoundation MATLAB MapKit CoreData01 Problem
Retailers needed a frictionless loyalty check-in system that worked without requiring customers to open apps or scan QR codes. Traditional beacon-based solutions required expensive hardware installations.
03 Solution
Developed a mobile loyalty application using ultrasound-based auto check-ins. Created a proprietary transmitter system and used MATLAB to design filters for processing ultrasound signals, mitigating noise and acoustic reflections. The app automatically detected when customers entered participating stores.
04 Outcomes
Qualitative
- Enabled frictionless customer loyalty check-ins
- Eliminated need for QR code scanning or manual check-in
- Pioneered ultrasound-based mobile interaction technology
Quantitative
- Check-in detection accuracy: 95
- Battery impact: 5
06 Constraints
- Must work without dedicated hardware at retailer locations
- Ultra-low latency detection required
- Battery efficiency critical for continuous listening
- Must filter acoustic noise in retail environments
07 Innovation
Developed custom ultrasound signal processing algorithm using MATLAB for filter design. Created bandpass filters to isolate ultrasound frequencies while rejecting ambient noise and acoustic reflections.
Novelty: high
