Real-time, nonverbal coaching for every player
SilentSignal is an open-source haptic communication system that enables coaches to send real-time signals to players via wearable vibration devices — built for accessibility in youth sports, with a focus on hard-of-hearing athletes.
Youth athletes frequently miss critical coaching cues due to crowd noise, distance, and sensory challenges. Deaf or hard-of-hearing players are often excluded from full team communication entirely. Existing tools — hand signals, shouting, Apple Watch apps — each fall short in cost, accessibility, or real-time reliability.
SilentSignal uses affordable, Arduino-based hardware and 433MHz RF communication to transmit distinct vibration patterns from a coach-side transmitter to player-worn receiver devices. No smartphone required. Just clear, immediate haptic feedback.
Applications
Youth Sports
Inclusive coaching for hard-of-hearing athletes in team sports
Industrial
Silent communication in high-noise factory and construction environments
Emergency Services
Tactical signals for first responders in chaotic, loud scenarios
Military / Tactical
Stealth communication without visual or audible signals
| Signal | Vibration Pattern | Description |
|---|---|---|
| GO | 1 long pulse | Move forward / execute play |
| STOP | 3 short pulses | Hold position / freeze |
| LEFT | 2 short pulses | Shift left |
| RIGHT | 2 long pulses | Shift right |
| TIMEOUT | Rapid burst | Stop play / gather |
Key Features
Open Source
Fully open hardware and software — build, modify, and share freely
No Smartphone Needed
Works standalone with Arduino and RF — no apps or subscriptions
Affordable
Built with low-cost components from common starter kits
Player Targeting
Send signals to individual players or broadcast to the whole team
Custom Patterns
Define your own vibration patterns for any signal you need
Wearable
Compact receiver fits on wrist or arm — no bulky equipment