I am using the keypad library to include keypad and input numbers. when a specific number is entered a sound must be made. However when I input using the serial monitor , sound is working. But when I include keypad , it only inputs numbers but not sound. Help please , how can I make both work? Thanks.

#include <Keypad.h> const byte ROWS = 4; //four rows const byte COLS = 4; //four columns char keys[ROWS][COLS] = { {'1','2','3','A'}, {'4','5','6','B'}, {'7','8','9','C'}, {'*','0','#','D'} }; byte rowPins[ROWS] = {12, 11, 10, 9}; //connect to the row pinouts of the keypad byte colPins[COLS] = {8,7,6,5}; //connect to the column pinouts

Then I get the input from keypad and store as result

char guess = 'n'; char keypressed = keypad.getKey(); if (keypressed != NO_KEY) { char guess = keypressed;

in void loop, it get result(key from keypad) and must play it: Tried separate sketch it works. but with keypad only input is , not sound.

Serial.print("You guessed:"); Serial.println(guess); result = checkYourself(guess); Serial.println(result); playSound(result);

check yourself takes in guess from keypad ,checks then returns as result. play sound function works when tried in another sketch( sorry not posting too much code its very long)

  • 3
    it is difficult to determine the problem area without seeing your code ... please include minimal sketch that still exhibits the undesired behavior
    – jsotola
    Nov 7, 2019 at 20:34
  • I just posted it thanks. Nov 7, 2019 at 21:30
  • which pin are you using for the buzzer?
    – jsotola
    Nov 7, 2019 at 21:39
  • using pin 9 .... Nov 7, 2019 at 21:52
  • which pins does the keypad use?
    – jsotola
    Nov 7, 2019 at 22:04

2 Answers 2


I was able to solve it , piezo dissent work in pin 9 but works when connected to pin 13.


Please make sure that the pin connected to piezo does NOT used by keypad

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