SSD1306 128x32 OLED not clearing

Projects Programming
1

Hey all I have been trying to figure out how to go about clear the screen but even using:

display.clearDisplay();

Does not clear the screen.

This is the type of OLED I have:
enter image description here

Here my full code:

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

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 32

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
String content = "";
char character;

void setup() {
  Serial.begin(115200);

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

  display.clearDisplay();
  display.display();
}

void sayOnScreeen(String saying) {
    display.clearDisplay();
    display.clearDisplay();
    //display.display();

    display.setTextSize(2);
    display.setTextColor(WHITE);
    display.setCursor(0, 0);
    display.println(saying);
    display.display(); 
}

void loop() {
  while(Serial.available()) {
      character = Serial.read();
      content.concat(character);
  }

  if (content != "") {
      sayOnScreeen(content);
  }
}

Every time I send a word via the serial it just appends it to the last word that was sent instead of clearing the screen and then write that word. Every time I send something via the serial I want it to clear the screen and then display what was sent.

Any ideas? Did I miss some code somewhere or am I not using the correct command(s)?

2

image

Doh! I see where I messed up. I needed to clear the character variable.

while(Serial.available()) {
    if (character != '@') {
      Serial.println("found @");
      character = Serial.read();
      content.concat(character);
    }
  }

  if (content != "") {
    character = "";
    sayOnScreeen(content);
    content = "";
  }

All works now as it should....

3

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