⚠️lag warning ⚠️
In bottom middle, there're two potentiometers and one push bottom, they are used for controlling
Left potentiometer is used to select the position where the data is stored (shown in lamps at bottom left, or in the decimal point on 7-segment display)
Right potentiometer is used to assign the data to be stored (shown in the 7-segment display at right side)
Push button is for saving the data
