Well ..... was thinking to add this as a new instrument for my car. But now I'm working on to improve further. I will be adding a gas sensor to detect CO2 level in ppm. For display, I will use a bigger Colour TFT. But I will share this simple one for now ........
This is a simple project to explore some methods to generate display on OLED.
OLED, which stands for Organic Light-Emitting Diode, is a display technology that utilizes organic compounds to emit light when an electric current is applied. This technology consists of thin layers of organic materials positioned between two electrodes, typically a cathode and an anode. The key component is the emissive electroluminescent layer, which is responsible for emitting light in response to the electric current. When electricity passes through this layer, it excites the organic molecules, causing them to emit light.
For this project, two type of displays will be projected on to the OLED ;
1. Temperature and Humidity reading from DHT11 sensor and
2. Customs scrolling text display ( contents of the text can be edited )
Video of the display on OLED
List of components ;
1. Arduno UNO
2. DHT11 sensor
3. OLED 128 x 64
4. Jumper wires
Circuit Diagram ;
And below is the coding. Copy and paste to Aduino IDE, ensure to get the needed libraries, modify text display as you wish and compile & upload.
//Temp & Humid Meter With Custom
Text Display on OLED
//By Rosedi 20May2024
#include
<Wire.h>
#include
<Adafruit_GFX.h>
#include
<Adafruit_SSD1306.h>
#include
<DHT.h>
// Define the OLED reset pin
#define
OLED_RESET -1
Adafruit_SSD1306 display(128,
64, &Wire,
OLED_RESET);
// DHT11 sensor settings
#define
DHTPIN 2
// Digital pin connected to the DHT sensor
#define
DHTTYPE DHT11
// DHT 11
DHT dht(DHTPIN,
DHTTYPE);
// Define the scrolling text
const
char *scrollText = "ALLAHUMMA
SOLLI ALA MUHAMMAD ";
int
textX = 128; // Start the text
off-screen to the right
int
textY = 56; // Vertically
position the text at the bottom
void
setup()
{
// Initialize Serial for
debugging
Serial.begin(9600);
// Initialize the DHT sensor
dht.begin();
// Initialize the OLED display
if
(!display.begin(SSD1306_SWITCHCAPVCC,
0x3C)) {
// 0x3C is the I2C address for the SSD1306
Serial.println(F("SSD1306
allocation failed"));
for
(;;);
// Loop forever if OLED initialization fails
}
// Clear the buffer
display.clearDisplay();
// Display initial text
display.setTextSize(1);
// Set text size
display.setTextColor(SSD1306_WHITE);
// Set text color
display.setCursor(16,
0);
// Set cursor position
display.print(F("ASSALAMMUALAIKUM
ROSEDI"));
display.display();
// Display the text
delay(5000);
// Pause for 5 seconds
// Display initial text
display.setTextSize(1);
// Set text size
display.setTextColor(SSD1306_WHITE);
// Set text color
display.setCursor(0,
35);
// Set cursor position
display.print(F("
FASTEN YOUR SEATBELT"));
display.display();
// Display the text
delay(5000);
// Pause for 5 seconds
// Display initial text
display.setTextSize(1);
// Set text size
display.setTextColor(SSD1306_WHITE);
// Set text color
display.setCursor(0,
52);
// Set cursor position
display.print(F("
SAFE JOURNEY"));
display.display();
// Display the text
delay(5000);
// Pause for 5 seconds
}
// Function to display scrolling text
void
displayScrollingText()
{
display.clearDisplay();
display.setTextSize(1);
display.setTextColor(SSD1306_WHITE);
display.setCursor(textX,
textY);
display.print(scrollText);
display.display();
// Move the text to the left
textX--;
if
(textX < -((int)strlen(scrollText)
* 6)) {
textX = 88;
// Reset text position to start again
}
}
void
loop()
{
// Read temperature and
humidity from DHT11 sensor
float
humidity = dht.readHumidity();
float
temperature = dht.readTemperature();
// Check if any reads failed
and exit early (to try again).
if
(isnan(humidity)
|| isnan(temperature))
{
Serial.println(F("Failed
to read from DHT sensor!"));
return;
}
// Print the values to the
Serial Monitor (for debugging)
Serial.print(F("Humidity:
"));
Serial.print(humidity);
Serial.print(F("%
Temperature: "));
Serial.print(temperature);
Serial.println(F("°C
"));
// Clear the display buffer
display.clearDisplay();
// Display temperature
display.setTextSize(2);
display.setTextColor(SSD1306_WHITE);
display.setCursor(6,10);
display.print(F("T:
"));
display.print(temperature);
display.print(F("
C"));
// Display humidity
display.setCursor(6,34);
display.print(F("H:
"));
display.print(humidity);
display.print(F("
%"));
// Update the display with the
new data
display.display();
// Display scrolling text
displayScrollingText();
// Wait a few seconds between
measurements
delay(0);
}
Actually if you look into the program, there are a litte extra functions compare to the one shown in the video. The display will come in three parts, greetings, sensor values and scrolling text. Just try it out.
Happy exploring !
To purchase the parts for this project, click on below links ;
Arduino UNO R3 (Original Italy)
DHT11 Sensor
OLED 128 X 64 I2C
