Arduino UNO digital port should not have much, if it is five numeric keys have to occupy five ports, it is a waste of resources.
However ADKeyboard module lets you use an analog port to read state five keys for Arduino save IO port. In addition, the five buttons labeled S1 to S5, when any key is pressed, the bottom of the corresponding LED will light up. With the Arduino sensor expansion board, you can complete multiple buttons interactive works.

• Arduino UNO digital port should not have much, if it is five numeric keys have to occupy five ports, it is a waste of resources.
• However ADKeyboard module lets you use an analog port to read state five keys for Arduino save IO port.
• In addition, the five buttons labeled S1 to S5, when any key is pressed, the bottom of the corresponding LED will light up.
• With the Arduino sensor expansion board, you can complete multiple buttons interactive works.

Arduino UNO digital port should not have much, if it is five numeric keys have to occupy five ports, it is a waste of resources.Haweier