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Button-Controlled Door Lock

From Tyler Stogner and Grayson Bennett on Hackster.io:

Have you ever had your hands full of groceries, wrapped up in the freezing cold, desperate to get into the warmth of your own house? Then you may know the struggle of having to fumble for your keys or having to set down all the groceries just to unlock the door and pick them back up. That is now a thing of the past! Using two Photons, a servo and small modifications to your door lock, you can unlock and lock your door at the push of a button!

Connected to one of the Photons (we will call this the Receiver Photon) is an Adafruit 315 MHz RF Receiver. To compliment the RF receiver, an Adafruit 315 MHz, 2 button remote control was used to communicate with the receiver. The RF receiver is a latching type receiver. This means that it functions like a selector switch. When the button A on the remote is pushed, it sets the voltage of the respective pin (D2 on the receiver) to high. The nominal voltage of the output is the same voltage as the power supplied.

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