Password Hint!

For this project, users need to follow some steps to find the required password. They need to access the serial monitor and type '1', an equation will appear on the serial monitor, and a message will display on the LCD. Users need to type '2' and '3' to get the rest of the other equations. The answers to the equations are the digits of the password. They need to press the digits at the same order of the equations; they also need to press the sequence on the keypad twice.  

Figure 1, Video

Figure 2, Picture

Figure 3, Sketch

Figure 4, Instructions

Figure 5, Schematic