Hardware-wise, there is an Arduino Nano Every in charge of the LDR module that reads the flashlight input and the 12 V relay that unlocks the door. Be sure to check it out it the video after the ...

Arduino has announced a new line of Nano boards that will begin shipping next month. From the design, to the chips and features on the board, to the price, there’s a lot that is new here. I ...

While relatively old, the Arduino Nano is still priced at $24.90, which is a significant price leap from the more recent and more affordable Nano Every that you can get for $13.70.