I'm looking for guidance to build a prototype that can make fake heartbeat rhythms. The goal is to imitate the heartbeat physically.
I'm thinking it could be done with some speakers in a box and something wrapped on it to create vibration?
Do you guys have any experience or thoughts on this?
Would a vibration motor work if it can be tuned to vibrate in 1/2 Hz (although I'm not sure if this is possible)
Physically is quite wide subject.. Maybe solenoid pump would be closest. What you exactly need to output?
That's pretty vague. Is it supposed to vary based on some input that changes or is the heartbeat the input to something else like reading pulse in medical instruments but from a "fake" external source?
Please describe the project in its entirety and your ultimate goal.
Quality speakers will rock the house without being wrapped in anything. Ever stick your head in a bass cannon at a rave? Neither have I...
Turn this up to 11. Human heart beat audio frequency is between 20-150Hz.
Normal heart beat (audio).
Raw ECG signals (you figure out the format)
Hello WaiHan
Welcome to the best Arduino forum ever 
Take a look at the IDE example BlinkWithOutDelay.
This example is the mother of all Arduino project timers and can easily be adapted to the systole and diastole, also known as the cardiac cycle, of the heart.
Try it out.