eLab Hackerspace GSM Access Control System

In this Instructable we'll show you hot to make a GSM Access Control System for your hackerspace/garage/house/bedroom/dormroom/laboratory just like the one we built for eLab Hackerspace. We only used some scavenged parts but they can be replaced with similar parts with minor changes. This system allows you to control who can access the space where it is used by keeping a list of authorised members phone num ...

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