I'm trying to build a bracelet (fastened such that it does not rotate with respect to the wrist) with small vibrating motors at regular intervals. The goal is to pulse these motors to indicate the direction of magnetic north relative to the bracelet, with the motor closest to magnetic north being pulsed. This is inspired by similar projects using belts or anklets instead of bracelets. In my previous attempts, I have had difficulty telling which motor was vibrating, because activating any motor caused the entire bracelet to vibrate.
Are there any existing projects or products with directional haptic input via bracelet? If not, can you recommend any techniques for isolating vibrations between segments?
(I'm using an arduino, a HMC5883L 3 axis magnetometer, and small eccentric rotating mass motors, but I'm open to suggestion)