Arduino's OLED screen cycles through the image every so often

Using Arduino Sensors
1

By using the Adafruit_SSD1306 and Adafruit_SSD1306 libraries. The code is uploaded correctly but the oled image is sometimes displaced as seen in the image.
animation
Code:

#include <Adafruit_GFX.h> 
#include <Adafruit_SSD1306.h>
#include <Wire.h>
#include <Adafruit_MLX90614.h>
Adafruit_MLX90614 mlx = Adafruit_MLX90614();
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#define OLED_RESET     0 // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

/****************************************
*Funciones principales
****************************************/
void setup() {
display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
display.clearDisplay(); 
mlx.begin();  
}
void loop()
{
Oled_mlx(); //Función para la oled y el sensor 
}

void Oled_mlx() {
display.clearDisplay();
display.setTextSize(2);
display.setTextColor(WHITE);
display.setCursor(0,0);
display.println("T_Ambiente");
display.print("   ");
display.println(mlx.readAmbientTempC()); //mlx.readAmbientTempF()
display.println("T_Objeto");
display.print("   ");
display.println(mlx.readObjectTempC()); //mlx.readObjectTempF()
display.display();
}
2

That's what display.display() does, if my memory serves me from using an oled with that library some years ago.

3

I thought display.display() closed out a command, but maybe try this code without display.display()?

To me, it looks like the position of the data is commanded to display at the zeroth pixel in the row.

4

Actually there's more to it than what I said earlier it seems. I found my old code, and display.display() in setup() with a short delay() shows the splash screen which is in the buffer. But my use of it in loop() does not. I don't see why your one does seem to have the logo in the buffer still.

5

Can we get a "freeze" frame of the jumpy part? (I can not).

6

loop( ) runs very very fast.

Only update the display ~500ms (1/2 sec).

1 Like
7

if I removed the statement: display.display();
it does not show anything on the oled. Thx for the answer

8

it works fine when the image is displayed every 500 ms, this may be because the I2C communication is not that fast? thx

9

I'm not sure my answer is 100% correct or perhaps should say not 100% complete. As I said, I have it in setup() of a sketch and it displays the logo but in loop() it does not. And adafruit's examples use display.display() all over; that's what I based my code on.

In one of the examples it says:

// Clear the buffer.
  display.clearDisplay();

So it seems that although you have a clear too, it's not actually clearing?

void Oled_mlx() {
display.clearDisplay();

It seems that display.display() is used to actually update the display, so if you took it out is your display actually updating?

10

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