Arduino - Button Count - OLED

In this tutorial, we are going to use Arduino:

In this tutorial, the button also is debounced without using delay() function. See Why do we need debouncing?

Hardware Required

1×Arduino UNO or Genuino UNO
1×USB 2.0 cable type A/B
1×SSD1306 I2C OLED Display 128x64
4×Jumper Wires
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About OLED and Button

If you do not know about OLED and button (pinout, how it works, how to program ...), learn about them in the following tutorials:

Wiring Diagram

Arduino Button OLED Wiring Diagram

Image is developed using Fritzing. Click to enlarge image

Arduino Code - displaying button count on OLED

Quick Steps

  • On Arduino IDE, Go to Tools Manage Libraries
  • Arduino add library
  • Search “ezButton”, then find the button library by ArduinoGetStarted
  • Click Install button to install ezButton library.
  • Arduino button library
  • Search “SSD1306”, then find the SSD1306 library by Adafruit
  • Click Install button to install the library.
  • Arduino OLED library
  • You will be asked for intalling some other library dependencies
  • Click Install All button to install all library dependencies.
  • Arduino Adafruit GFX sensor library
  • Copy the above code and open with Arduino IDE
  • Click Upload button on Arduino IDE to upload code to Arduino
  • Press button several times
  • See the counting number changed on OLED

The above code just displays the button press count on the top left corner. Let's modify the code to centralize it!

Arduino Code - Vertical and Horizontal Center Align on OLED

/* * Created by * * This example code is in the public domain * * Tutorial page: */ #include <Wire.h> #include <Adafruit_GFX.h> #include <Adafruit_SSD1306.h> #include <ezButton.h> #define SCREEN_WIDTH 128 // OLED display width, in pixels #define SCREEN_HEIGHT 64 // OLED display height, in pixels Adafruit_SSD1306 oled(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1); // create SSD1306 display object connected to I2C ezButton button(7); // create ezButton object that attach to pin 7; unsigned long lastCount = 0; void setup() { Serial.begin(9600); // initialize OLED display with address 0x3C for 128x64 if (!oled.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { Serial.println(F("SSD1306 allocation failed")); while (true); } delay(2000); // wait for initializing oled.clearDisplay(); // clear display oled.setTextSize(2); // text size oled.setTextColor(WHITE); // text color oled.setCursor(0, 10); // position to display button.setDebounceTime(50); // set debounce time to 50 milliseconds button.setCountMode(COUNT_FALLING); } void loop() { button.loop(); // MUST call the loop() function first unsigned long count = button.getCount(); if (lastCount != count) { Serial.println(count); // print count to Serial Monitor String text = String(count); oledDisplayCenter(text); lastCount != count; } } void oledDisplayCenter(String text) { int16_t x1; int16_t y1; uint16_t width; uint16_t height; oled.getTextBounds(text, 0, 0, &x1, &y1, &width, &height); // display on horizontal and vertical center oled.clearDisplay(); // clear display oled.setCursor((SCREEN_WIDTH - width) / 2, (SCREEN_HEIGHT - height) / 2); oled.println(text); // text to display oled.display(); }

See How to vertical/horizontal center on OLED for more detail.

Video Tutorial

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