If you’re out on a supply run, then you’ll definitely want this silent communication device, which uses trembling buzzer motors and radio modules to send two-way messages. With this final project, you can communicate without attracting unwanted attention.
PROJECT 20: SILENT HAPTIC COMMUNICATION WITH ARDUINO
The problem with walkie-talkies is that, as the name suggests, they require talking. Zombies have very acute hearing for human speech and will easily home in on any desperate request for backup that you shriek into a walkie-talkie. This is where a silent two-way haptic communication device comes into its own (see Figure ...