Display on SSD1306 screen a message transmitted to Arduino via Bluetooth

Arduino UNO 13-03-24

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Tutorial plan

1- How to display on SSD1306 screen a message transmitted to Arduino via Bluetooth ?

2- The necessary components to use the SSD1306 screen by Arduino

3- Arduino board wiring diagram with SSD1306 screnn

4- Program Arduino UNO to receive and display a message from the Smartphone

5- Develop a mobile application to send a message to Arduino UNO

How to display on SSD1306 screen a message transmitted to Arduino via Bluetooth ?

To display a message onSSD1306 screen connected to an Arduino Uno that is receiving messages via Bluetooth, you’ll need to follow a few steps. Here’s a general guide to help you achieve this:

Hardware Setup:

1- Connect your SSD1306 screen to the Arduino Uno. Typically, this involves connecting the SDA and SCL pins on the SSD1306 to the corresponding pins on the Arduino Uno, as well as providing power and ground.

2- Connect the Bluetooth module (e.g., HC-05) to the Arduino Uno. Connect the RX pin of the Bluetooth module to the TX pin of the Arduino Uno and vice versa. Also, connect the VCC and GND pins appropriately.

Software Setup:

1- Make sure you have the required libraries installed. You may need to install the “LiquidCrystal_I2C” library for the SSD1306 screen and the “SoftwareSerial” library for Bluetooth communication. You can install these libraries through the Arduino IDE Library Manager.

2- Write the Arduino code.

App Inventor:

1- Open App Inventor (https://appinventor.mit.edu/).

2- Create a new project.

3- Drag and drop the following components onto the designer screen:

4- In the Blocks editor, use the following blocks to connect and send a message to Arduino UNO

The necessary components to use the SSD1306 screen by Arduino

Arduino UNO Board

Arduino Uno

The Arduino Uno board is a microcontroller board based on the ATmega328P microcontroller. It’s one of the most popular and widely used boards in the Arduino family due to its simplicity and versatility.

It is the central control unit for your project.

HC-06 module bluetooth

HC-06 Bluetooth Module

The HC-06 Bluetooth module is a commonly used serial communication module that enables Bluetooth connectivity for various projects, including Arduino-based systems. It acts as a serial port Bluetooth module, allowing wireless communication between devices.

This module is used for receiving data from smartphone via Bluetooth.

SSD1306 screen

The SSD1306 is a popular display controller used in OLED (Organic Light-Emitting Diode) screens. It’s commonly employed in various electronics projects to showcase information on small screens. The SSD1306 controller is compatible with different screen sizes and is often integrated with microcontrollers like Arduino UNO board to display text, graphics, and images.

This screen is used for displaying the message sende by Smartphone.

Jumper Wires:

Jumper wires

For making temporary connections and wiring between components.

Breadboard:

Test plate

A breadboard is a useful tool for creating temporary electronic circuits. It allows you to connect components without soldering.

Arduino board wiring diagram with SSD1306 screen

Connect the SSD1306 screen to Arduino:

1- Connect the SDA (data line) of SSD1306 screen to A4 pin of Arduino.

2- Connect the SCL (clock line) of SSD1306 screen to A5 pin of Arduino.

3- Connect the VCC pin of SSD1306 screen to the 5V pin of Arduino.

4- Connect the GND pin of SSD1306 screen to GND pin of Arduino.

Connect the HC-06 Bluetooth Module to Arduino:

1- VCC pin of HC-06 module to 5V pin of Arduino

2- GND pin of HC-06 module to GND pin of Arduino

3- TXD pin of HC-06 module to pin 6 of Arduino

4- RXD pin of HC-06 to pin 7 of Arduino

Program Arduino UNO to receive and display a message from the Smartphone

To program the Arduino board, you’ll need to follow these steps.

1- import this library : Adafruit_SSD1306 for SSD1306 display

2- Create a new Arduino script to read data from HC-06 module and display it on SSD1306 screen :

#include <SoftwareSerial.h>
#include <Adafruit_SSD1306.h>

// Configure the SSD1306 display
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT   64 // OLED display height, in pixels
// Declaration for an SSD1306 display connected   to I2C (SDA, SCL pins)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT,   &Wire, -1);

SoftwareSerial hc06(6,7);
String message="";

void setup(){
  //Initialize Bluetooth Serial Port
  hc06.begin(9600);
  //Serial.begin(9600);

   //For OLED I2C
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C))   { // Address 0x3D for 128x64
    Serial.println(F("SSD1306 allocation failed"));
     for(;;);
  }
  display.display(); //Display logo
  delay(1000); 
   display.clearDisplay();
}

void loop(){

  //Read data from HC06 Bluetooth module
  while(hc06.available()>0){
    message+=(char)hc06.read();
  }

  if(message!=""){
    display.clearDisplay();
    display.display(); 
     //Serial.print("message received= "); 
     //Serial.println(message);
    display.setTextSize(2);
    display.setTextColor(WHITE);
    display.setCursor(0, 28);
    // Display message sende by Smartphone on SSD1306 screen
    display.print(message);
    display.display();  
    message=""; //reset message
  }

  delay(100);
}

#include <SoftwareSerial.h>

#include <Adafruit_SSD1306.h>

// Configure the SSD1306 display

#define SCREEN_WIDTH 128 // OLED display width, in pixels

#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

SoftwareSerial hc06(6,7);

String message="";

void setup(){

//Initialize Bluetooth Serial Port

hc06.begin(9600);

//Serial.begin(9600);

//For OLED I2C

if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64

Serial.println(F("SSD1306 allocation failed"));

for(;;);

}

display.display(); //Display logo

delay(1000);

display.clearDisplay();

}

void loop(){

//Read data from HC06 Bluetooth module

while(hc06.available()>0){

message+=(char)hc06.read();

}

if(message!=""){

display.clearDisplay();

display.display();

//Serial.print("message received= ");

//Serial.println(message);

display.setTextSize(2);

display.setTextColor(WHITE);

display.setCursor(0, 28);

// Display message sende by Smartphone on SSD1306 screen

display.print(message);

display.display();

message=""; //reset message

}

delay(100);

}

Develop a mobile application to send a message to Arduino UNO

1- Create the designer of mobile app with App Inventor.

– Use the available Bluetooth components to establish a connection with the Arduino.

– Add text fields to write a message.

– Add button to sen the message to Arduino

Here is the Designer part of the application with App Inventor :

2. Programming the application with App Inventor:

1- Starting with Android 12, Bluetooth permissions have been enhanced to improve security and user data protection. This is why we must declare the authorizations that your application needs in the AndroidManifest.xml file. For Bluetooth, you’ll need to include ACCESS_FINE_LOCATION, BLUETOOTH_SCAN, and possibly BLUETOOTH_CONNECT permissions, depending on the features you’re using.