In this project I will go over the steps for building a Time-based One-time passwords (TOTP) Smart Safe. If you are not familiar with TOTP here is a good article that describes What is a Time-based One-time Password (TOTP)? | Twilio.
In a nutshell, its a method for calculating a 6 digit passcode given a pre-determined key based on the current date/time. This means that as long as the Safe can keep track of time, I will be able to use my Authenticator app to get a new passcode every 30 seconds, with which I will be able to open the safe.
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