4X4 Keypad Input Display Through OLED

In this tutorial basically we’re going to learn how to take input from keypad and show it on our desired OLED display. For this i would suggest you see my other tutorials as prerequisite Keypad Tutorial and OLED Display Tutorial

If you miss these tutorial you might not be able to do this.

Step 1: Working With the Oled DIsplay

Including Library:

Both libraries below needs to be installed before you are able to continue with this instructable.
https://github.com/adafruit/Adafruit_SSD1306 (SSD1306 library)

https://github.com/adafruit/Adafruit_SSD1306 (GFX library)

The connections from the display:

VCC to arduino 5v GND to arduino GND SCL to arduino pin A5 SDA to arduino pin A4

Library Correction :

For Adafruit_SSD1306 Library:
Go to: C:\Program Files (x86)\Arduino\libraries\Adafruit_SSD1306 Open Adafruit_SSD1306.h (in a text editor like Notepad++ for example) Find and comment out the line: #define SSD1306_128_32 Uncomment the line: #define SSD1306_128_64 Open the ssd1306_128x64_i2c example in Arduino: Change address from 0x3D to 0x3C in void setup()

Step 2: Connecting the Keypad and Oled With Arduino

Connecting keypad with aruduino digital pins:

Keypad Pin Connects to Arduino Pin

1                              D9

2                              D8

3                              D7

4                              D6

5                              D5

6                              D4

7                              D3

8                              D2

Connecting OLED with aruduino Analog pins:

VCC to arduino 5v GND to arduino GND SCL to arduino pin A5 SDA to arduino pin A4.

Step 3: Uploading Code…

Heres the code….

#include <SPI.h>
#include <Wire.h>
#include <Keypad.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define OLED_RESET 4
Adafruit_SSD1306 display(OLED_RESET);
#define NUMFLAKES 10
#define XPOS 0
#define YPOS 1
#define DELTAY 2
#define LOGO16_GLCD_HEIGHT 16
#define LOGO16_GLCD_WIDTH 16

static const unsigned char PROGMEM logo16_glcd_bmp[] = { B00000000, B11000000, B00000001, B11000000, B00000001, B11000000, B00000011, B11100000, B11110011, B11100000, B11111110, B11111000, B01111110, B11111111, B00110011, B10011111, B00011111, B11111100, B00001101, B01110000, B00011011, B10100000, B00111111, B11100000, B00111111, B11110000, B01111100, B11110000, B01110000, B01110000, B00000000, B00110000 };
#if (SSD1306_LCDHEIGHT != 64)
#error(“Height incorrect, please fix Adafruit_SSD1306.h!”);
#endif

const byte numRows= 4; //number of rows on the keypad
const byte numCols= 4; //number of columns on the keypad

char keymap[numRows][numCols]=
{
{‘1’, ‘2’, ‘3’, ‘A’},
{‘4’, ‘5’, ‘6’, ‘B’},
{‘7’, ‘8’, ‘9’, ‘C’},
{‘*’, ‘0’, ‘#’, ‘D’}
};

byte rowPins[numRows] = {9,8,7,6}; //Rows 0 to 3
byte colPins[numCols]= {5,4,3,2}; //Columns 0 to 3

//initializes an instance of the Keypad class
Keypad myKeypad= Keypad(makeKeymap(keymap), rowPins, colPins, numRows, numCols);

void setup() {

Serial.begin(9600);

display.begin(SSD1306_SWITCHCAPVCC, 0x3C); // initialize with the I2C addr 0x3D (for the 128×64) // init done // Show image buffer on the display hardware.

display.display(); //delay(2000);

display.setTextSize(1);

display.setTextColor(WHITE);

display.setCursor(10, 0);

display.clearDisplay();

display.println(“INPUT YOUR TEXT HERE: “);

// invert the display

display.invertDisplay(true);

display.invertDisplay(false);

display.display();

display.clearDisplay(); }

void loop() {

while (1) {

display.setTextSize(1);

display.setTextColor(WHITE);

display.setCursor(10, 0);

display.clearDisplay();

display.println(“input:”);

printText();

display.display();

}

}

void printText(void) {

String s;

char keypressed = myKeypad.getKey();
if (keypressed != NO_KEY)
{
Serial.print(keypressed);
display.println(keypressed);

display.display();

display.println(“\n”);
}
delay(4000);

}

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