If you’ve recently purchased an Apple Watch and want even more functionality out of it, here’s a project to turn your new timepiece into a remote key for your home or office door. Developed by the clever folks at Make, it uses an app to generate a 128-bit radio frequency (RF) key. Combine that with an RF-enabled Arduino board and you’re on the way to unlocking your door with your watch. The entire exercise will set you back about $100, which covers the cost of the electronics and a door strike to contain them. As well as sharing the video tutorial…
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