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KEYPAD

There many kind of keypads in Arduino. So you can use any kind of Arduino keypads. There are some images of keypad.

KEYPAD INTERFACING​

HIGH SIDE SWITCHING​

LOW SIDE SWITCHING​

KEYPAD CONNECTIONS​

EXERCISE​

  • Based on switch array input change the frequency of sound at which the buzzer beeps

HARDWARE​

SOFTWARE​

Practise Exercise​

  • Based on switch array set some tone