ESP32-HEXKEYPAD

              ESP32-HEXKEYPAD

Aim:

To interface 4x4 HexKeypad with ESP32-Microcontroller module and display the pressed numbers on the Serial monitor.

Description:

To display the pressed key on the serial monitor.

Hardware Required:

ESP32-Microcontroller Development board

Pin Connection:

Pin Mapping:

Development Board	ESP32
C1	I025
C2	I026
C3	I05
C4	I027
R1	I04
R2	I012
R3	I033
R4	I032

Procedure:

1.        The above pin connection shows how to interface Hexkeypad with ESP32 board.

2.        Do the connections as shown in the pin diagram and pin mapping.

3.        Connect the USB cable to the board.

4.        Open Arduino IDE .Select DOIT ESP32 DEVKIT V1in boards and select COM port.

5.        Now verify the program and Upload it.

6.        After uploading is done open serial monitor to observe the output.

7.        For a particular switch the same number displays on our serial monitor.

Program:

/* Include the Keypad header file */

#include<Keypad.h>

/* four rows */

const byte ROWS=4;

/* four columns */ constbyteCOLS=4;

/* define the symbols on the buttons of the keypads */ charhexaKeys[ROWS][COLS]={

{'0','1','2','3'},

{'4','5','6','7'},

{'8','9','A','B'},

{'C','D','E','F'}

};

/* connect to the row pinouts of the keypad */ byterowPins[ROWS]={4,12,33,32};

/* connect to the column pinouts of the keypad */ bytecolPins[COLS]={25,26,5,27};

/* initialize an instance of class NewKeypad */ KeypadcustomKeypad=Keypad(makeKeymap(hexaKeys),rowPins,colPins,ROWS,COLS);

/* counter intialization */ intcounter=0;

void setup(void)

{

Serial.begin(9600);

}

void loop(void)

{

/* Key pressed is stored in customkey */ charcustomKey=customKeypad.getKey(); if(customKey)

{

/* Key pressed is stored in customkey */

Serial.println(customKey);

}

}