You’re annoyed when someone turned on your Hi-Fi without your permission first? You wish there is some kind of lock, which can prevents this type of incident in the future?

Well, if you don’t mind, spend few minutes by reading here, as you will learn how to build a concealed codelock today…

Here how is works:

You will need an ATMEGA8, which it will use as the microcontroller for this project. It will frequently scans the ADC4 channel of the ADC, where is fully connected offboard to a potentiometer. The pot will act as a voltage divider, the one end of it is connected to +5V and the other one will connect to the Ground. The ADC scans the divider continuously to detect if there any change has been happened. Read more »