Bluetooth LE is good enough for short-range communication, and there are a ton of boards and Kickstarter projects out there that are ready to fill the need. [Michah] has built what is probably the ...
His build uses an Arduino Mega with a BlueSMiRF Silver Bluetooth board that actively searches for his phone and initiates a connection if in range. Doors are unlocked directly through a 2 ...
In response to community feedback for more I/O options, Seeed Studio has recently launched the Seeed Studio XIAO Plus series ...
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