Similarly, the keypad is a viable option in the embedded systems as it requires a smaller number of pins and is compact in size. For instance, when a passcode is required to open a door or to authorize any access. These keypads are mostly used with the embedded systems where human and machine interaction is needed. KeypadsĪ Keypad is a small version of keyboard which can perform limited functions. This discourse explains the procedure for interfacing keypad with Arduino and displaying its input on the LCD. Similarly, the inputs can be displayed using the serial monitor as well as with any LCD module. The keypad comes in handy when human input is required to perform some tasks like entering a password or turning on and off any appliance and many more. These inputs can be integers, characters or some control functions. To give the inputs to the Arduino board manually we can interface the keypad with Arduino.
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