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Chirp Charm

Project Description:

The device is powered by piezoelectric energy generated through walking or other movement, minimizing the need for frequent charging and increasing reliability in critical moments. When activated by a vigorous stomp, the alarm emits a distinct sound that reaches up to 100 decibels—about the volume of a car horn or your average rock concert. The device attaches to the top of a shoe using two lace holes, with a thin piezo pad resting inside. A strong stomp or kick activates a “Listening” mode, indicated by a haptic vibration, turning the safety off to arm the device. If a second stomp occurs within 10 seconds, a 104-decibel alarm is triggered; otherwise, the device resets automatically.

Project Photo:

5 ECE students wearing Chirp Charm, a small personal safety device charm attached to their shoes.

is a hands-free alarm worn discreetly on a shoe—designed to be intuitive and easy to activate in an emergency.

Student Team Members

  • Nidhi Batra
  • Emma Dionne
  • Eric Ji
  • Thaissa Peixoto
  • Lauren Phillips

Course Faculty

  • Lucas Buccafusca
  • Lawrence Aronhime

Project Mentors, Sponsors, and Partners

  • JHU Department of Electrical and Computer Engineering