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Despite the differences in size and microcontroller, the Arduino Nano and Micro share some similar ... Their onboard LEDs are connected to pin D13, and their serial RX/TX pins are on pins D0 ...
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 ...
Although a “CommsLink” module providing an RS-232 port was available back in the day, it’s become hard to find, inspiring [James] to design a completely new module based on an Arduino Nano.