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 ...

However, while the Uno is a helpful board for your beginner projects, it still has its limitations, so you can't just use it for every ... the Arduino Nano and Micro share some similar pinout ...

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 ... However, their pinouts are ...