Counter by OLED Display

This project utilizes an OLED display alongside two input switches to allow a user to increment two digits displayed on the screen (tens and units). The code consists of setup and loop functions that manage the display and the switch inputs.

Components Required

• Arduino Board (e.g., Arduino Uno, Nano)
• OLED Display (based on SSD1306)
• 2 Push Button Switches
• Resistors (if necessary for switches)
• Jumper Wires
• Breadboard (optional)

Code Breakdown

1. Libraries and Constants

cpp

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128 // Width of the OLED display in pixels
#define SCREEN_HEIGHT 64 // Height of the OLED display in pixels
#define OLED_RESET -1 // Reset pin (or use -1 for sharing Arduino reset pin)

cpp


#include <Wire.h>  
#include <Adafruit_GFX.h>  
#include <Adafruit_SSD1306.h>  

#define SCREEN_WIDTH 128 // Width of the OLED display in pixels  
#define SCREEN_HEIGHT 64  // Height of the OLED display in pixels  
#define OLED_RESET -1     // Reset pin (or use -1 for sharing Arduino reset pin)

• The code starts by including necessary libraries to control the OLED display.
• Constants are defined for the display's width, height, and reset pin.

2. Object Initialization

cpp

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

cpp


Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

• An instance of Adafruit_SSD1306 is created to manage the OLED display.

3. Pin Configuration

cpp

const int switch1Pin = 2; // Pin for switch 1
const int switch2Pin = 3; // Pin for switch 2

int tens = 0; // Initialized tens place to 0
int units = 0; // Initialized units place to 0

cpp


const int switch1Pin = 2; // Pin for switch 1  
const int switch2Pin = 3; // Pin for switch 2  

int tens = 0; // Initialized tens place to 0  
int units = 0; // Initialized units place to 0

• Two pins are declared for the switches, and variables for tens and units are initialized.

4. setup Function

cpp

void setup() {
pinMode(switch1Pin, INPUT_PULLUP);
pinMode(switch2Pin, INPUT_PULLUP);

if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
Serial.println(F("SSD1306 allocation failed"));
for(;;); // Loop forever if allocation fails
}

display.clearDisplay();
updateDisplay();
}

cpp


void setup() {  
    pinMode(switch1Pin, INPUT_PULLUP);  
    pinMode(switch2Pin, INPUT_PULLUP);  

    if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {  
        Serial.println(F("SSD1306 allocation failed"));  
        for(;;); // Loop forever if allocation fails  
    }  

    display.clearDisplay();  
    updateDisplay();  
}

In the setup function:

• The pins for the switches are set to input mode with internal pull-up resistors.
• The OLED display is initialized. If it fails, the program will loop indefinitely.
• The display is cleared and updated to show initial values.
• In the setup function:The pins for the switches are set to input mode with internal pull-up resistors.The OLED display is initialized. If it fails, the program will loop indefinitely.The display is cleared and updated to show initial values.

5. loop Function

cpp

void loop() {
// Check first switch
if (digitalRead(switch1Pin) == LOW) {
delay(50); // Debouncing delay
if (digitalRead(switch1Pin) == LOW) {
tens = (tens + 1) % 10; // Increment tens
updateDisplay();
while (digitalRead(switch1Pin) == LOW); // Wait for release
}
}

// Check second switch
if (digitalRead(switch2Pin) == LOW) {
delay(50); // Debouncing delay
if (digitalRead(switch2Pin) == LOW) {
units = (units + 1) % 10; // Increment units
updateDisplay();
while (digitalRead(switch2Pin) == LOW); // Wait for release
}
}
}

cpp


void loop() {  
    // Check first switch  
    if (digitalRead(switch1Pin) == LOW) {  
        delay(50); // Debouncing delay  
        if (digitalRead(switch1Pin) == LOW) {  
            tens = (tens + 1) % 10; // Increment tens  
            updateDisplay();  
            while (digitalRead(switch1Pin) == LOW); // Wait for release  
        }  
    }  

    // Check second switch  
    if (digitalRead(switch2Pin) == LOW) {  
        delay(50); // Debouncing delay  
        if (digitalRead(switch2Pin) == LOW) {  
            units = (units + 1) % 10; // Increment units  
            updateDisplay();  
            while (digitalRead(switch2Pin) == LOW); // Wait for release  
        }  
    }  
}

• The loop function continuously checks if either switch is pressed, with debounce logic to prevent multiple counts from a single press.

For each switch:

• If pressed, the corresponding digit (tens or units) is incremented and wrapped around using modulo 10.
• The display is updated to reflect the new values.
• For each switch:If pressed, the corresponding digit (tens or units) is incremented and wrapped around using modulo 10.The display is updated to reflect the new values.

6. updateDisplay Function

cpp

void updateDisplay() {
display.clearDisplay();
display.setTextSize(2); // Set text size to 2
display.setTextColor(SSD1306_WHITE); // Set text color to white
display.setCursor(0, 0); // Set cursor position
display.print(tens); // Print tens value
display.print(units); // Print units value
display.display(); // Render the display
}

cpp


void updateDisplay() {  
    display.clearDisplay();  
    display.setTextSize(2); // Set text size to 2  
    display.setTextColor(SSD1306_WHITE); // Set text color to white  
    display.setCursor(0, 0); // Set cursor position  
    display.print(tens); // Print tens value  
    display.print(units); // Print units value  
    display.display(); // Render the display  
}

• The updateDisplay function clears the display, sets the text size and color, positions the cursor, and prints the current tens and units values on the screen.